Installation Instructions
Original Instructions
FLEX I/O Input, Output, and Input/Output Analog Modules
Catalog Numbers 1794-IE8, 1794-OE4, and 1794-IE4XOE2, Series B
| Topic | Page |
| Summary of Changes | 1 |
| Installing Your Analog Input/Output Module | 4 |
| Connecting Wiring for the Analog Inputs and Outputs | 5 |
| Specifications | 10 |
Summary of Changes
This publication contains the following new or updated information. This list includes substantive updates only and is not intended to reflect all changes.
| Topic | Page |
| Updated template | throughout |
| Removed K catalogs | throughout |
| Updated Environment and Enclosure | 3 |
| Updated UK and European Hazardous Location Approval | 3 |
| Updated IEC Hazardous Location Approval | 3 |
| Updated Special Conditions for Safe Use | 4 |
| Updated General Specifications | 11 |
| Updated Environmental Specifications | 11 |
| Updated Certifications | 12 |
ATTENTION: Read this document and the documents listed in the Additional Resources section about installation, configuration and operation of this equipment before you install, configure, operate or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards. Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are equired to be carried out by suitably trained personnel in accordance with applicable code of practice. If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.
Environment and Enclosure
ATTENTION: This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in EN/IEC 60664-1), at altitudes up to 2000 m (6562 ft) without derating.
This equipment is not intended for use in residential environments and may not provide adequate protection to radio communication services in such environments.
This equipment is supplied as open-type equipment for indoor use. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present and appropriately designed to prevent personal injury resulting rom accessibility to live parts. The enclosure must have suitable flame-retardant properties to prevent or minimize the spread of flame, complying with a flame spread rating of 5V A or be approved for the application if nonmetallic. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain more information regarding specific enclosure type ratings that are required to comply with certain product safety certifications. In addition to this publication, see the following:
- Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1, for additional installation requirements.
- NEMA Standard 250 and EN/IEC 60529, as applicable, for explanations of the degrees of protection provided by enclosures.
WARNING: When you insert or remove the module while backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.
WARNING: If you connect or disconnect wiring while the field side power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.
ATTENTION: This product is grounded through the DIN rail to chassis ground. Use zinc plated chromate-passivated steel DIN rail to assure proper grounding.
The use of other DIN rail materials (for example, aluminum or plastic) that can corrode, oxidize, or are poor conductors, can result in improper or intermittent grounding. Secure DIN rail to mounting surface approximately every 200 mm (7.8 in.) and use end- anchors appropriately. Be sure to ground the DIN rail properly. See the Industrial Automation Wiring and Grounding Guidelines, Rockwell Automation publication 1770-4.1, for more information.
ATTENTION: Preventing Electrostatic Discharge
This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:
- Touch a grounded object to discharge potential static.
- Wear an approved grounding wriststrap.
- Do not touch connectors or pins on component boards.
- Do not touch circuit components inside the equipment.
- If available, use a static-safe workstation.
UK and European Hazardous Location Approval
The following analog input/output modules are European Zone 2 approved: 1794-IE8, 1794-OE4, and 1794-IE4XOE2, Series B.
The following applies to products marked II 3 G:
- Are Equipment Group II, Equipment Category 3, and comply with the Essential Health and Safety Requirements relating to the design and construction of such equipment given in Schedule 1 of UKEX and Annex II of EU Directive 2014/34/EU. See the UKEx and EU Declaration of Conformity at rok.auto/certifications for details.
- The type of protection is Ex ec IIC T4 Gc (1794 IE8) according to EN IEC 60079-0:2018 and EN IEC 60079-7:2015+A1:2018.
- The type of protection is Ex nA IIC T4 Gc (1794-OE4 and 1794-IE4XOE2) according to EN 60079-0:2009 & EN 60079-15:2010.
- Comply to Standard EN IEC 60079-0:2018 & EN IEC 60079-7:2015+A1:2018 reference certificate number DEMKO 14 ATEX 1342501X and UL22UKEX2378X.
- Comply to Standards: EN 60079-0:2009, EN 60079-15:2010, reference certificate number LCIE 01ATEX6020X.
- Are intended for use in areas in which explosive atmospheres caused by gases, vapors, mists, or air are unlikely to occur, or are likely to occur only infrequently and for short periods. Such locations correspond to Zone 2 classification according to UKEX regulation 2016 No. 1107 and ATEX directive 2014/34/EU.
IEC Hazardous Location Approval
The following applies to products marked with IECEx certification (1794-IE8):
- Are intended for use in areas in which explosive atmospheres caused by gases, vapors, mists, or air are unlikely to occur, or are likely to occur only infrequently and for short periods. Such locations correspond to Zone 2 classification to IEC 60079-0.
- The type of protection is Ex ec IIC T4 Gc according to IEC 60079-0 and IEC 60079-7.
- Comply to Standards IEC 60079-0, Explosive atmospheres Part 0: Equipment – General requirements, Edition 7, Revision Date 2017, IEC 60079-7, 5.1 Edition revision date 2017, Explosive atmospheres – Part 7: Equipment protection by increased safety “e”, reference IECEx certificate number IECEx UL 14.0066X.
WARNING: Special Conditions for Safe Use:
- This equipment shall be mounted in an UKEX/ATEX/IECEx Zone 2 certified enclosure with a minimum ingress protection rating of at least IP54 (in accordance with EN/IEC 60079-0) and used in an environment of not more than Pollution Degree 2 (as defined in EN/IEC 60664-1) when applied in Zone 2 environments.
The enclosure must be accessible only by the use of a tool. - This equipment shall be used within its specified ratings defined by Rockwell Automation.
- Transient protection shall be provided that is set at a level not exceeding 140% of the peak rated voltage value at the supply terminals to the equipment.
- This equipment must be used only with UKEX/ATEX/IECEx certified Rockwell Automation backplanes.
- Secure any external connections that mate to this equipment by using screws, sliding latches, threaded connectors, or other means provided with this product.
- Do not disconnect equipment unless power has been removed or the area is known to be nonhazardous.
- Earthing is accomplished through mounting of modules on rail.
North American Hazardous Location Approval
The following modules are North American Hazardous Location approved: 1794-IE8, 1794-OE4, and 1794-IE4XOE2, Series B.
The Following Information Applies When Operating This Equipment In Hazardous Locations.
Products marked “CL I, DIV 2, GP A, B, C, D” are suitable for use in Class I Division 2 Groups A, B, C, D, Hazardous Locations and nonhazardous locations only. Each product is supplied with markings on the rating nameplate indicating the hazardous location temperature code. When combining products within a system, the most adverse temperature code (lowest “T” number) may be used to help determine the overall temperature code of the system. Combinations of equipment in your system are subject to investigation by the local Authority Having Jurisdiction at the time of installation.
WARNING:
Explosion Hazard –
- Do not disconnect equipment unless power has been removed or the area is known to be nonhazardous.
- Do not disconnect connections to this equipment unless power has been removed or the area is known to be nonhazardous. Secure any external connections that mate to this equipment by using screws, sliding latches, threaded connectors, or other means provided with this product.
- Substitution of components may impair suitability for Class I, Division 2.
Installing Your Analog Input/Output Module
The FLEX™ I/O Input, Output and Input/Output Analog module mounts on a 1794 terminal base.
ATTENTION: During mounting of all devices, be sure that all debris (metal chips, wire strands, etc.) is kept from falling into the module. Debris that falls into the module could cause damage on power up.
- Rotate the keyswitch (1) on the terminal base (2) clockwise to position 3 (1794-IE8), 4 (1794-OE4) or 5 (1794-IE4XOE2) as required.
- Make certain the Flexbus connector (3) is pushed all the way to the left to connect with the neighboring terminal base or adapter. You cannot install the module unless the connector is fully extended.
- Make sure the pins on the bottom of the module are straight so they will align properly with the connector in the terminal base.
- Position the module (4) with its alignment bar (5) aligned with the groove (6) on the terminal base.
- Press firmly and evenly to seat the module in the terminal base unit. The module is seated when the latching mechanism (7) is locked into the module.
Connecting Wiring for the Analog Inputs and Outputs
- Connect individual input/output wiring to numbered terminals on the 0-15 row (A) for 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, and 1794-TB3TS, or on row (B) for the 1794-TBN as indicated in Table 1, Table 2, and Table 3.
IMPORTANT Use Belden 8761 cable for signal wiring. - Connect channel common/return to the associated terminal on row (A) or row (B) for the 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, and 1794-TB3TS, or on row C for the 1794-TBN. For input devices requiring terminal base power, connect the channel power wiring to the associated terminal on row (C).
- Connect any signal wiring shields to functional ground as near as possible to the module. 1794-TB3T or 1794-TB3TS only: Connect to earth ground terminals C-39…C-46.
- Connect the +V DC power to terminal 34 on the 34-51 row (C) and -V common/return to terminal 16 on the B row. ATTENTION: To reduce susceptibility to noise, power analog modules and digital modules from separate power supplies. Do not exceed a length of 9.8 ft (3 m) for DC power cabling.
- If daisychaining +V power to the next terminal base, connect a jumper from terminal 51 (+V DC) on this base unit to terminal 34 on the next base unit.
- If continuing DC common (-V) to the next base unit, connect a jumper from terminal 33 (common) on this base unit to terminal 16 on the next base unit.
Table 1 – Wiring Connections for the 1794-IE8 Analog Input Modules
| Channel | Signal Type | Label Marking | 1794-TB2, 1794-TB3′ 1794-TB3S, 1794-TB3T, 1794-TB3TS | u94-TB3, 1794-TB3S | 1794-TB2, 1794-TB3, 1794-TB3S | 1794-TB3T, 1794-TB3TS | |
| Input | Power0(¹) | Common Terminal | Shield | ||||
| Input 0 | Current | 10 | A-0 | C-35 | B-17 | B-17 | C 39 |
| Voltage | VO | A-1 | C-36 | B-18 | B-17 | ||
| Input 1 | Current | 11 | A-2 | C-37 | B-19 | B-19 | C 40 |
| Voltage | V1 | A-3 | C-38 | B-20 | B-19 | ||
| Input 2 | Current | 12 | A-4 | C-39 | B-21 | B-21 | C 41 |
| Voltage | V2 | A-5 | C-40 | B-22 | B-21 | ||
| Input 3 | Current | 13 | A-6 | C-41 | B-23 | B-23 | C 42 |
| Voltage | V3 | A-7 | C-42 | B-24 | B-23 | ||
| Input 4 | Current | 14 | A-8 | C-43 | B-25 | B-25 | C 43 |
| Voltage | V4 | A-9 | C-44 | B-26 | B-25 | ||
| Input 5 | Current | 15 | A-10 | C-45 | B-27 | B-27 | C 44 |
| Voltage | V5 | A-11 | C-46 | B-28 | B-27 | ||
| Input 6 | Current | 16 | A-12 | C-47 | B-29 | B-29 | C 45 |
| Voltage | V6 | A-13 | C-48 | B-30 | B-29 | ||
| Input 7 | Current | 17 | A-14 | C-49 | B-31 | B-31 | C 46 |
| Voltage | V1 | A-15 | C-50 | B-32 | B-31 | ||
| -V DC Common | 1794-TB2, 1794-TB3, and 1794-TB3S – Terminals 16…33 are internally connected in the terminal base unit. 1794-TB3T and 1794-TB3TS – Terminals 16, 17, 19, 21, 23, 25, 27, 29, 31, and 33 are internally connected in the terminal base unit. | ||||||
| +V DC Power | 1794-TB3 and 1794-TB3S – Terminals 34…51 are internally connected in the terminal base unit. 1794-TB3T and 1794-TB3TS – Terminals 34, 35, 50, and 51 are internally connected in the terminal base unit. 1794-TB2 – Terminals 34 and 51 are internally connected in the terminal base unit. | ||||||
(1) Use when transmitter requires terminal base power.
Terminal Base Wiring for the 1794-IE8
Table 2 – Wiring Connections for the 1794-OE4 Output Modules
| Channel | Signal Type | Label Marking | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-111315 | 1794-TBN | |
| Output Terminal(¹) | Shield (1794-TB3T, 1794-113315) | Output Terminal(²) | |||
| Output 0 | Current | 10 | A-0 | C 39 | B-0 |
| Current | 10 Ret | A-1 | C-1 | ||
| Voltage | VO | A-2 | C 40 | B-2 | |
| Voltage | VO Ret | A-3 | C-3 | ||
| Output 1 | Current | 11 | A-4 | C 41 | B-4 |
| Current | 11 Ret | A-5 | C-5 | ||
| Voltage | V1 | A-6 | C 42 | B-6 | |
| Voltage | V1 Ret | A-7 | C-7 | ||
| Output 2 | Current | 12 | A-8 | C 43 | B-8 |
| Current | 12 Ret | A-9 | C-9 | ||
| Voltage | V2 | A-10 | C 44 | B-10 | |
| Voltage | V2 Ret | A-11 | C-11 | ||
| Output 3 | Current | 13 | A-12 | C 45 | B-12 |
| Current | 13 Ret | A-13 | C-13 | ||
| Voltage | V3 | A-14 | C 46 | B-14 | |
| Voltage | V3 Ret | A-15 | C-15 | ||
| -V DC Common | 1794-TB3 and 1794-TB3S – Terminals 16…33 are internally connected in the terminal base unit. 1794-TB3T and 1794-TB3TS – Terminals 16, 17, 19, 21, 23, 25, 27, 29, 31, and 33 are internally connected in the terminal base unit. 1794-TB2 – Terminals 16 and 33 are internally connected in the terminal base unit | ||||
| +V DC Power | 1794-TB3 and 1794-TB3S – Terminals 34…51 are internally connected in the terminal base unit. 1794-TB3T and 1794-TB3TS – Terminals 34, 35, 50, and 51 are internally connected in the terminal base unit. 1794-TB2 – Terminals 34 and 51 are internally connected in the terminal base unit. | ||||
| Chassis ground (Shield) | 1794-TB3T, 1794-TB3TS – Terminals 39…46 are internally connected to chassis ground. | ||||
- 1, 3, 5, 7, 9, 11, 13, and 15 are internally connected in the module to 24V DC common.
- 1, 3, 5, 7, 9, 11, 13, and 15 are internally connected in the module to 24V DC common.
Terminal Base Wiring for the 1794-OE4
Table 3 – Wiring Connections for the 1794-IE4XOE2 4-Input 2-Output Analog Module
| Channel | Signal Type | Label Marking | 1794-TB2, 1794-TB3, 1794-TB3S’ 1794-TB3T, 1794-TB3TS | 1794-TB3, 1794-TB3S | 1794-TB2, 1794-TB3′ 1794-TB3S | 1794-TB3T, 1794-TB3TS | |
| Input/Output Terminal(1) | Power Terminal(2) | Common Terminal | Shield | ||||
| Input 0 | Current | 10 | A-0 | C-35 | B-17 | B-17 | C 39 |
| Voltage | VO | A-1 | C-36 | B-18 | B-17 | ||
| Input 1 | Current | 11 | A-2 | C-37 | B-19 | B-19 | C 40 |
| Voltage | V1 | A-3 | C-38 | B-20 | B-19 | ||
| Input 2 | Current | 12 | A-4 | C-39 | B-21 | B-21 | C 41 |
| Voltage | V2 | A-5 | C-40 | B-22 | B-21 | ||
| Input 3 | Current | 13 | A-6 | C-41 | B-23 | B-23 | C 42 |
| Voltage | V3 | A-7 | C-42 | B-24 | B-23 | ||
| Output 0 | Current | 10 | A-8 | C-43 | |||
| Current | RET | A-9 | |||||
| Voltage | VO | A-10 | C-44 | ||||
| Voltage | RET | A-11 | |||||
| Output 1 | Current | 11 | A-12 | C-45 | |||
| Current | RET | A-13 | |||||
| Voltage | V1 | A-14 | C-46 | ||||
| Voltage | RET | A-15 | |||||
| -V DC Common | 1794-TB2, 1794-TB3, and 1794-TB3S – Terminals 16…33 are internally connected in the terminal base unit. 1794-TB3T and 1794-TB3TS – Terminals 16, 17, 1R 21, 23, 25, 27, 29, 31, and 33 are internally connected in the terminal base unit. | ||||||
| +V DC Power | 1794-TB3 and 1794-TB3S – Terminals 34…51 are internally connected in the terminal base unit. 1794-TB3T and 1794-TB3TS – Terminals 34, 35, 50, and 51 are internally connected in the terminal base unit. 1794-TB2 – Terminals 34 and 51 are internally connected in the terminal base unit. | ||||||
| Chassis ground (Shield) | 1794-TB3T and 1794-TB3TS – Terminals 39…46 are internally connected to chassis ground. | ||||||
- A-9, 11, 13 and 15 are internally connected in the module to 24V DC common.
- Use when transmitter requires terminal base power.
Terminal Base Wiring for the 1794-IE4XOE2
Input Map (Read) – 1794-IE8
| Dec. | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Oct | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Word 0 | S | Analog input value for Channel 0 | ||||||||||||||
| Word 1 | S | Analog input value for Channel 1 | ||||||||||||||
| Word 2 | S | Analog input value for Channel 2 | ||||||||||||||
| Word 3 | S | Analog input value for Channel 3 | ||||||||||||||
| Word 4 | S | Analog input value for Channel 4 | ||||||||||||||
| Word 5 | S | Analog input value for Channel 5 | ||||||||||||||
| Word 6 | S | Analog input value for Channel 6 | ||||||||||||||
| Word 7 | S | Analog input value for Channel 7 | ||||||||||||||
| Word 8 | PU | Not used – set to zero | U7 | U6 | U5 | U4 | U3 | U2 | Ul | UO | ||||||
| Where: PU = Power up inconfigured S = Sign bit in 2’s complement U = Underrange for specified channel | ||||||||||||||||
Output Map (Write) – 1794-IE8
| Dec. | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Oct | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Word 3 | C7 | C6 | C5 | C4 | C3 | C2 | Cl | CO | F7 | F6 | F5 | F4 | F3 | F2 | Fl | FO |
| Where: C = Configure select bit F = Full range bit | ||||||||||||||||
Input Map (Read) – 1794-IE4XOE2
| Dec. | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Oct | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Word 0 | S | Analog input value for Channel 0 | ||||||||||||||
| Word 1 | S | Analog input value for Channel 1 | ||||||||||||||
| Word 2 | S | Analog input value for Channel 2 | ||||||||||||||
| Word 3 | S | Analog input value for Channel 3 | ||||||||||||||
| Word 4 | PU | Not used – set to zero | W1 | WO | U3 | U2 | Ul | UO | ||||||||
| Where: PU = Power up inconfigured S = Sign bit in 2’s complement W1 and W0 = Diagnostic bits for current output. Wire off current loop status for output channels 0 and 1. U = Underrange for specified channel | ||||||||||||||||
Output Map (Write) – 1794-IE4XOE2
| Dec. | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Oct | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Word 0 | S | Analog output data – Channel 0 | ||||||||||||||
| Word 1 | S | Analog output data – Channel 1 | ||||||||||||||
| Word 2 | Not used – set to 0 | 111 | MO | |||||||||||||
| Word 3 | 0 | 0 | C5 | C4 | C3 | C2 | Cl | CO | 0 | 0 | F5 | F4 | F3 | F2 | Fl | FO |
| Words 4 and 5 | Not used – set to 0 | |||||||||||||||
| Word 6 | Safe state value for Channel 0 | |||||||||||||||
| Word 7 | Safe state value for Channel 1 | |||||||||||||||
| Where: PU = Power up inconfigured CF = In configuration mode DN = Calibration accepted U = Underrange for specified channel P0 and P1 = Outputs holding in response to Q0 and Q1 FP = Field power off BD = Bad calibration W1 and W0 = Wire off current loop status for output channels 0 and 1 V = Overrange for specified channel | ||||||||||||||||
Range Selection Bits – 1794-IE8 and 1794-IE4XOE2
| 1794-1E8 | In Ch. 0 | In Ch. 1 | In Ch. 2 | In Ch. 3 | In Ch. 4 | In Ch. 5 | In Ch. 6 | In Ch. 7 | ||||||||
| 1794- 1E4X0E2 | In Ch. 0 | In Ch.1 | In Ch. 2 | In Ch. 3 | Out Ch. 0 | Out Ch. 1 | ||||||||||
| FO | CO | Fl | Cl | F2 | C2 | F3 | C3 | F4 | C4 | F5 | C5 | F6 | C6 | F7 | C7 | |
| Dec. Bits | 0 | 8 | 1 | 9 | 2 | 10 | 3 | 11 | 4 | 12 | 5 | 13 | 6 | 14 | 7 | 15 |
| 0…10V DC/0…20 mA | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 |
| 4…20 mA | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| -10. +10V DC | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Off(1) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Where: C = Configure Select bit F = Full range | ||||||||||||||||
- When configured to Off, individual input channels will return 0000H; Output channels will drive 0V/0 mA.
Input Map (Read) – 1794-OE4
| Dec. | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Oct | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Word 0 | PU | Not used – set to 0 | W3 | W2 | W1 | WO | ||||||||||
| Where: PU = Power up bit W…W3 = Wire off current loop status for output channels | ||||||||||||||||
Output Map (Write) – 1794-OE4
| Dec. | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Oct. | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Word 0 | S | Output Data Channel 0 | ||||||||||||||
| Word 1 | S | Output Data Channel 1 | ||||||||||||||
| Word 2 | S | Output Data Channel 2 | ||||||||||||||
| Word 3 | S | Output Data Channel 3 | ||||||||||||||
| Word 4 | Not used – set to 0 | M3 | M2 | M1 | MO | |||||||||||
| Word 5 | Not used – set to 0 | C3 | C2 | Cl | CO | Not used – set to 0 | F3 | F2 | Fl | FO | ||||||
| Word 6…9 | Not used – set to 0 | |||||||||||||||
| Word 10 | S | Safe state value for Channel 0 | ||||||||||||||
| Word 11 | S | Safe state value for Channel 1 | ||||||||||||||
| Word 12 | S | Safe state value for Channel 2 | ||||||||||||||
| Word 13 | S | Safe state value for Channel 3 | ||||||||||||||
| Where: S = Sign bit in 7s complement M = Multiplex control bit C = Configure select bit F = Full range bit | ||||||||||||||||
Range Selection Bits – 1794-OE4
| Channel No. | In Ch. 0 | In Chi | In Ch. 2 | In Ch. 3 | ||||
| FO | CO | Fl | Cl | F2 | C2 | F3 | C3 | |
| Dec. Bits | 0 | 8 | 1 | 9 | 2 | 10 | 3 | 11 |
| 0…10V DC/0…20 mA | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 |
| 4…20 mA | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| -10…+10V DC | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Off(1) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Where: C = Configure select bit F = Full range | ||||||||
- When configured to Off, individual output channels will drive 0V/0 mA.
Specifications
Input Specifications
| (Attribute | Value |
| Number of inputs, nonisolated | 1794-1E8 – 8 single-ended – 4 single-ended |
| Resolution Voltage Current | 12 bits unipolar; 11 bits plus sign bipolar 2.56mV/cnt unipolar; 5.13mV/cnt bipolar 5.13pA/cnt |
| Data format | Left justified, 16 bit 2’s complement |
| Conversion type | Successive approximation |
| Conversion rate | 256ps all channels |
| Input current terminal, user configurable | 4…20 mA 0..20 mA |
| Input voltage terminal, user configurable | +10V0…10V |
| Normal mode rejection ratio – Voltage terminal Current terminal | 3 dB @ 17 Hz; -20 dB/decade -10 dB @ 50 Hz; -11.4 dB @ 60 Hz -3 dB @ 9 Hz; -20 dB/decade -15.3 dB @ 50 Hz; -16.8 dB @ 60Hz |
| Step response to 63% – | Voltage terminal – 9.4 ms Current terminal – 18.2 ms |
| Input impedance | Voltage terminal – 100 kfl Current terminal – 238 0 |
| Input resistance voltage | Voltage terminal – 200 k0 Current terminal – 238 0 |
| Absolute accuracy | 0.20% full scale @ 25 °C |
| Accuracy drift with temperature | Voltage terminal – 0.00428% full scale/ °C Current terminal – 0.00407% full scale/ °C |
| Calibration required | None required |
| Maximum overload, one channel at a time | 30V continuous or 32 mA continuous |
| Indicators | 1 green power indicator |
- Includes offset, gain, nonlinearity, and repeatability error terms.
Output Specifications
| Attribute | Value |
| Number of outputs, nonisolated | 1794-0E4 – 4 single-ended, nonisolated 1794-1E4X0E2 – 2 single-ended |
| Resolution Voltage Current | 12 bits plus sign 0.156mV/cnt 0.320 pA/cnt |
| Data format | Left justified, 16 bit 2’s complement |
| Conversion type | Pulse width modulation |
| Output current terminal, user configurable | 0 mA output until module is configured 4…20 mA 0…20 mA |
| Output voltage terminal, user configurable | OV output until module is configured -F1OV 0…10V |
| Step response to 63% – voltage or current terminal | 24 ms |
| Current load on voltage output, max | 3 mA |
| Absolute accuracy(1) Voltage terminal Current terminal | 0.133% full scale @ 25 °C 0.425% full scale @ 25 °C |
| Accuracy drift with temperature Voltage terminal Current terminal | 0.0045% full scale/ °C 0.0069% full scale/ °C |
| Resistive load on mA output | 15…7501) @ 24V DC |
- Includes offset, gain, nonlinearity, and repeatability error terms.
General Specifications for 1794-IE8, 1794-OE4, and 1794-IE4XOE2
| Module location | 1794-1E8 and 1794-1E4X0E2 – 1794-TB2, 1794-TB3, 1794-11335, 1794-TB3T, and 1794-TB3TS terminal base units 1794-0E4 – 1794-182, 1794-T83, 1794-TB3S, 1794-TB3T, 1794-TB3TS, and 1794-TBN terminal base units |
| Terminal base screw torque | 7 lb•in (0.8 N•m) 1794-TBN – 9 113•in (1.0 N•m) |
| Isolation voltage | Tested at 850V DC for 1 s between user power to system No isolation between individual channels |
| External DC power supply Voltage range Supply current | 24V DC nominal 10.5…31.2V DC (includes 5% AC ripple) 1794-1E8 – 60 mA @ 24V DC 1794-0E4 – 150 mA @ 24V DC 1794-1E4X0E2 -165 mA @ 24V DC |
| Dimensions, with module installed | 31.8 H x 3.7 W x 2.1 D inches45.7 H x 94 W x 53.3 0 mm |
| Flexbus current | 15 mA |
| Power dissipation, max | 1794-1E8 – 3.0 W @ 31.2V DC 1794-0E4 – 4.5 W @ 31.2V DC 1794-1E4X0E2 – 4.0 W @ 31.2V DC |
| Thermal dissipation, max | 1794-1E8 – 10.2 BTU/hr @ 31.2V dc 1794-0E4 – 13.6 BTU/hr @ 31.2V dc 1794-1E4X0E2 – 15.3 BTU/hr @ 31.2V d |
| Keyswitch position | 1794-1E8 – 3 1794-0E4 – 4 1794-1E4X0E2 – 5 |
| North American temp code | 1794-1E4X0E2 – T4A 1794-1E8 – T5 1794-0E4 – T4 |
| UKEX/ATEX temp code | T4 |
| IECEx temp code | 1794-1E8 – T4 |
Environmental Specifications
| Attribute | Value |
| Temperature, operating | IEC 60068-2-1 (Test Ad, operating cold), IEC 60068-2-2 (Test Bd, operating dry heat), IEC 60068-2-14 (Test Nb, operating thermal shock): 0…55 °C (32…131 °F) |
| Temperature, surrounding air, max | 55 °C (131 °F) |
| Temperature, storage | IEC 60068-2-1 (Test Ab, unpackaged nonoperating cold), IEC 60068-2-2 (Test Bb, unpackaged nonoperating dry heat), IEC 60068-2-14 (Test Na, unpackaged nonoperating thermal shock): -40…15 °C (-40…+185 °F) |
| Relative humidity | IEC 60068-2-30 (Test Ob, unpackaged nonoperating damp heat): 5…95% non-condensing |
| Vibration | IEC60068-2-6 (Test Fc, operating): 5g @ 10…500Hz |
| Shock, operating | IEC60068-2-27 (Test Ea, unpackaged shock): 30g |
| Shock nonoperating | IEC60068-2-27 (Test Ea, unpackaged shock): 50g |
| Emissions | IEC 61000-6-4 |
| ESD immunity | EC 61000-4-2: 4kV contact discharges 8kV air discharges |
| Radiated RF immunity | IEC 61000-4-3:10V/m with 1 kHz sine-wave 80% AM from 80…6000 MHz |
| Conducted If immunity | IEC 61000-4-6: |
| 10V rms with 1 kHz sine-wave 80 MM from 150 kHz…30 MHz | |
| EFT/B immunity | IEC 61000-4-4: ±2 kV at 5 kHz on signal ports |
| Surge transient immunity | IEC 61000-4-5: ±2 kV line-earth (CM) on shielded ports |
| Enclosure type rating | None |
| Conductors Wire size Category | 22…12AWG (0.34 mm2…2.5 mm2) stranded copper wire rated at 75 °C or higher 3/64 inch (1.2 mm) insulation maximum 2 |
- You use this category information for planning conductor routing as described in the Industrial Automation Wiring and Grounding Guidelines, Rockwell Automation publication 1770-4.1.
Certifications
| Certifications (when product is marked►1) | Value |
| c-UL-us | UL Listed Industrial Control Equipment, certified for US and Canada. See UL File E65584. UL Listed for Class I, Division 2 Group A,B,C,D Hazardous Locations, certified for U.S. and Canada. See UL File E194810. |
| UK and CE | UK Statutory Instrument 2016 No. 1091 and European Union 2014/30/EU EMC Directive, compliant with: EN 61326-1; Meas./Control/Lab., Industrial Requirements EN 61000-6-2; Industrial Immunity EN 61131-2; Programmable Controllers EN 61000-6-4; Industrial Emissions UK Statutory Instrument 2012 No. 3032 and European Union 2011/65/EU RoHS, compliant with: EN 63000; Technical documentation |
| RCM | Australian Radiocommunications Act compliant with: EN 61000-6-4; Industrial Emissions |
| Ex | UK Statutory Instrument 2016 No. 1107 and European Union 2014/34/EU ATEX Directive, compliant with (1794-1E8): EN IEC 60079-0; General Requirements EN IEC 60079-7; Explosive Atmospheres, Protection He* II 3G Ex ec IIC T4 Gc DEMKO 14 ATEX 1342501X UL22UKEX2378X European Union 2014/34/EU AMC Directive, compiant with (1794-0E4 and 1794-IE4XOE2): EN 60079-0; General Requirements EN 60079-15; Potentially Explosive Atmospheres, Protection ‘n” II 3 G Ex nA IIC T4 Gc LCIE O1ATEX6O2OX |
| IECEx | IECEx System, compliant with (1794-1E8): IEC 60079-0; General Requirements IEC 60079-7; Explosive Atmospheres, Protection “e* Ex ec IIC T4 Gc IECEx UL 14.0066X |
| Morocco | Arrete ministeriel n° 6404-15 du 29 ramadan 1436 |
| CCC | CNCA-C23-01 3g$giIIrli’Dikiff rhaff11911 MOM, CNCA-C23-01 CCC Implementation Rule Explosion-Proof Electrical Products |
| KC | Korean Registration of Broadcasting and Communications Equipment compliant with: Article 58-2 of Radio Waves Act, Clause 3 |
| EAC | Russian Customs Union TR CU 020/2011 EMC Technical Regulation |
- See the Product Certification link at rok.auto/certifications for Declaration of Conformity, Certificates, and other certification details.
Notes:
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Publication 1794-IN100C-EN-P – October 2022 | Supersedes Publication 1794-IN100B-EN-P – June 2004 Copyright © 2022 Rockwell Automation, Inc. All rights reserved.
Documents / Resources
 | Allen-Bradley 1794-IE8 FLEX I-O Input Analog Modules [pdf] Instruction Manual 1794-IE8, 1794-OE4, 1794-IE4XOE2, 1794-IE8 FLEX I-O Input Analog Modules, FLEX I-O Input Analog Modules, Input Analog Modules, Analog Modules |