ACCES IO 104-IDIO-16 Isolated Digital Input Fet Output Board User Manual

The information in this document is provided for reference only. ACCES does not assume any liability arising out of the application or use of the information or products described herein. This document may contain or reference information and products protected by copyrights or patents and does not convey any license under the patent rights of ACCES, nor the rights of others.

IBM PC, PC/XT, and PC/AT are registered trademarks of the International Business Machines Corporation.
Printed in USA. Copyright 2003, 2005 by ACCES I/O Products, Inc. 10623 Roselle Street, San Diego, CA 92121. All rights reserved.

WARNING!!

ALWAYS CONNECT AND DISCONNECT YOUR FIELD CABLING WITH THE COMPUTER POWER OFF. ALWAYS TURN COMPUTER POWER OFF BEFORE INSTALLING A BOARD. CONNECTING AND DISCONNECTING CABLES, OR INSTALLING

BOARDS INTO A SYSTEM WITH THE COMPUTER OR FIELD POWER ON MAY CAUSE DAMAGE TO THE I/O BOARD AND WILL VOID ALL WARRANTIES, IMPLIED OR EXPRESSED.

Warranty

Before shipment, ACCES equipment is thoroughly inspected and tested to applicable specifications. However, should equipment failure occur, ACCES assures its customers that prompt service and support will be available. All equipment originally manufactured by ACCES which is found to be defective will be repaired or replaced subject to the following considerations.

Terms and Conditions

If a unit is suspected of failure, contact ACCES’ Customer Service department. Be prepared to give the unit model number, serial number, and a description of the failure symptom(s). We may suggest some simple tests to confirm the failure. We will assign a
Return Material Authorization (RMA) number which must appear on the outer label of the return package. All units/components should be properly packed for handling and returned with freight prepaid to the ACCES designated Service Center, and will be returned to the customer’s/user’s site freight prepaid and invoiced.

Coverage

First Three Years: Returned unit/part will be repaired and/or replaced at ACCES option with no charge for labor or parts not excluded by warranty. Warranty commences with equipment shipment.

Following Years: Throughout your equipment’s lifetime, ACCES stands ready to provide on-site or in-plant service at reasonable rates similar to those of other manufacturers in the industry.
Equipment Not Manufactured by ACCES

Equipment provided but not manufactured by ACCES is warranted and will be repaired according to the terms and conditions of the respective equipment manufacturer’s warranty.

General

Under this Warranty, liability of ACCES is limited to replacing, repairing or issuing credit (at ACCES discretion) for any products which are proved to be defective during the warranty period. In no case is ACCES liable for consequential or special damage arising from use or misuse of our product. The customer is responsible for all charges caused by modifications or additions to ACCES equipment not approved in writing by ACCES or, if in ACCES opinion the equipment has been subjected to abnormal use. “Abnormal use” for purposes of this warranty is defined as any use to which the equipment is exposed other than that use specified or intended as evidenced by purchase or sales representation. Other than the above, no other warranty, expressed or implied, shall apply to any such equipment furnished or sold by ACCES.

FUNCTIONAL DESCRIPTION

Chapter 1: FUNCTIONAL DESCRIPTION

This board provides isolated digital inputs with Change of State Detection and isolated FET solid state output interfaces for PC/104 compatible computers. The board provides sixteen optically-isolated inputs for AC or DC control signals and sixteen isolated FET solid state outputs. The board occupies eight consecutive addresses in I/O space. Read and write operations are done on an 8-bit-byte oriented basis. Many versions of this board are available. The basic model includes Change Of State (COS) detection on inputs (flags an interrupt), and model 16E doesn’t have COS detection and doesn’t use interrupts. Models IDIO-8 and IDIO-8E provide eight inputs and outputs. Models IDO-16 and IDO-8 have sixteen and eight outputs only, respectively. In eight-channel input and output versions, the I/O headers remain fully populated.

INPUTS

The isolated inputs can be driven by either AC or DC signals and are not polarity sensitive. Input signals are rectified by photocoupler diodes. A 1.8K-ohm resistor in series dissipates unused power. Standard 12/24 AC control transformer outputs can be accepted as well as DC voltages. The input voltage range is 3 to 31 volts (rms). External resistors connected in series may be used to extend the input voltage, however, this will raise the input threshold range. Consult with the factory for available modified input ranges.
Each input circuit contains a switchable slow/fast filter that has a 4.7 millisecond time constant. (Without filtering, the response is 10 uSec.) The filter must be selected for AC inputs to eliminate the on/off response to AC. The filter is also valuable for use with slow DC input signals in a noisy environment. The filter may be switched out for DC inputs to obtain faster response. Filters are individually selected by jumpers. The filters are switched into the circuit when the jumpers are installed in position IN0 to IN15.

INTERRUPTS

When enabled by a software read to base address +2 (and when a jumper is installed to select one of the interrupt levels IRQ2-7, IRQ10-12, and IRQ14-15), the basic board asserts an interrupt whenever any of the inputs changes state from high to low, or low to high. This is called Change-of-State (COS) detection. Once an interrupt has been generated and serviced, it must be cleared. A software write to the base address+1 will clear an interrupt. Before enabling the COS detection, clear any prior interrupt by writing to base address + 1. This interrupt may be disabled by a software write to base address +2, and later re-enabled. (Model IDIO-16 only)

OUTPUTS

The solid state outputs are comprised of sixteen fully protected and isolated FET outputs. The FETs have built-in current limiting and are protected against short-circuit, over-temperature, ESD and inductive load transients. The current limitation is activated until the thermal protection acts. The FETs are all off at power-on. Data to the FETs is latched by a write to the base address+0 and to base address+4.

Note: FETs have two output states: Off, where the output is high impedance (no current flows between the VBB and the output — except for the FET’s leakage current, amounting to a few µA), and On, where VBB is connected to the output pin.
Therefore, if no load is connected the FET output will have a high floating voltage (due to the leakage current and no path to the VBB switching voltages return). To mitigate this, please add a load to ground at the output.

INSTALLATION

Chapter 2: INSTALLATION

A printed Quick-Start Guide (QSG) is packed with the board for your convenience. If you’ve already performed the steps from the QSG, you may find this chapter to be redundant and may skip forward to begin developing your application.
The software provided with this PC/104 Board is on CD and must be installed onto your hard disk prior to use. To do this, perform the following steps as appropriate for your operating system. Substitute the appropriate drive letter for your CD-ROM where you see d: in the examples below.

CD Installation

The following instructions assume the CD-ROM drive is drive “D”. Please substitute the appropriate drive letter for your system as necessary.

DOS

Place the CD into your CD-ROM drive.
Type to change the active drive to the CD-ROM drive.
Type to run the install program.

Follow the on-screen prompts to install the software for this board.

WINDOWS

Place the CD into your CD-ROM drive.

The system should automatically run the install program. If the install program does not run promptly, click START | RUN and type , click OK or press .
Follow the on-screen prompts to install the software for this board.

LINUX

Please refer to linux.htm on the CD-ROM for information on installing under Linux.

Installing the Hardware

Before installing the board, carefully read Chapter 3 and Chapter 4 of this manual and configure the board according to your requirements. The SETUP Program can be used to assist in configuring jumpers on the board. Be especially careful with Address

Selection. If the addresses of two installed functions overlap, you will experience unpredictable computer behavior. To help avoid this problem, refer to the FINDBASE.EXE program installed from the CD. The setup program does not set the options on the board, these must be set by jumpers.

To Install the Board

Install jumpers for selected options and base address according to your application requirements, as mentioned above.

Remove power from the PC/104 stack.
Assemble standoff hardware for stacking and securing the boards.
Carefully plug the board onto the PC/104 connector on the CPU or onto the stack, ensuring proper alignment of the pins before completely seating the connectors together.

Install I/O cables onto the board’s I/O connectors and proceed to secure the stack together, or repeat steps
5 until all boards are installed using the selected mounting hardware.
Check that all connections in your PC/104 stack are correct and secure, then power up the system.

Run one of the provided sample programs appropriate for your operating system that was installed from the CD to test and validate your installation.

OPTION SELECTION

Chapter 3: OPTION SELECTION

FILTER RESPONSE SWITCH

Jumpers are used to select input filtering on a channel-by-channel basis. When jumper IN0 is installed, additional filtering is introduced for input bit 0, IN1 for bit 1, etc.
This additional filtering provides a slower response for DC signals as described previously and must be used when AC inputs are applied.

INTERRUPTS

Select the desired interrupt level by installing a jumper at one of the locations marked IRQxx. An interrupt is asserted by the board when an Isolated Digital Input bit changes state, if enabled in software as previously described.

ADDRESS SELECTION

Chapter 4: ADDRESS SELECTION

The board occupies eight consecutive addresses in I/O space (although only six addresses are used). The base or starting address can be selected anywhere within the I/O address range 100-3FF provided that it does not cause an overlap with other functions. If the addresses of two installed functions overlap, you will experience unpredictable computer behavior. The FINDBASE program supplied by ACCES will assist you in selecting a base address that will avoid this conflict.

Table 4-1: Address Assignments for Computers

The base address is set up by JUMPERS. Those jumpers control address bits A3 through A9. (Lines A2, A1 and A0 are used on the board to control individual registers. How these three lines are used is described in the Programming section of this manual.)

To determine how to set these JUMPERS for a desired hex-code address, refer to the SETUP program provided with the board. If you prefer to determine proper jumper settings yourself, first convert the hex-code address to binary form. Then, for each “0”, install corresponding jumpers and for each “1”, remove the corresponding jumper.
The following example illustrates jumper selection corresponding to hex 300 (or binary 11 0000 0xxx). The “xxx” represents address lines A2, A1, and A0 used on the board to select individual registers as described in the Programming section of this manual.

Base Address in Hex Code	3		0				0
Conversion Factors	2	1	8	4	2	1	8
Binary Representation	1	1	0	0	0	0	0
Jumper Legend	A9	A8	A7	A6	A5	A4	A3
Addr. Line Controlled	A9	A8	A7	A6	A5	A4	A3
Jumper Selection	OFF	OFF	ON	ON	ON	ON	ON

Carefully review the address selection reference table on the preceding page before selecting the board address. If the addresses of two installed functions overlap, you will experience unpredictable computer behavior.

PROGRAMMING

Chapter 5: PROGRAMMING

The board occupies eight consecutive addresses in PC I/O space. The base, or starting address is selected during installation and will fall on an eight-byte boundary. The board’s read and write functions as follows (model 16E doesn’t use Base +2):

I/O Address

Read

Write

Base + 0

Base + 1

Base + 2

Base + 3

Base + 4

Base + 5

Readback

Read Isolated Inputs 0 – 7 Enable IRQ

N/A Readback

Read Isolated Inputs 8 – 15

Write FET Outputs 0 – 7 Clear Interrupt Disable IRQ

N/A

Write FET Outputs 8 – 15 N/A

ISOLATED DIGITAL INPUTS

Isolated digital input states are read as a single byte from the port at Base Address +1 for inputs 0 – 7 or Base Address + 5 for inputs 8 -15. Each of the eight bits within the byte corresponds to a particular digital input. A “1” signifies that the input is energized, (on/high) and a “0” signifies that the input is de-energized (off/low).

Read at Base +1

Bit Position	D7	D6	D5	D4	D3	D2	D1	D0
Iso Digital Input	IN7	IN6	IN5	IN4	IN3	IN2	IN1	IN0

Read at Base +5

Bit Position	D7	D6	D5	D4	D3	D2	D1	D0
Iso Digital Input	IN15	IN14	IN13	IN12	IN11	IN10	IN9	IN8

The board response to inputs is rated at 10 uSec. Sometimes it is necessary to slow down that response to accommodate AC inputs or in noisy environments. Hardware installation of JUMPERS to implement filtering is provided.
The board supports interrupts on change of state of isolated digital inputs. Thus, it is NOT necessary to continuously poll inputs (by reading at base address +1 and 5) to detect any state change. To enable this interrupt capability, read at base address +2. To disable interrupts, write at base address +2 or remove the JUMPER that selects interrupt levels (IRQ2 – IRQ7, IRQ10 – IRQ12, IRQ14 and IRQ15).

SOLID STATE OUTPUTS

At power-up, all FET’s are initialized in the off state. The outputs are controlled by writing to the Base Address for FET’s 0 – 7 and Base + 4 for FET’s 8 -15. Data is written to all eight FET’s as a single byte. Each bit within the byte controls a specific FET. A “0” turns on the corresponding FET output and a “1” turns it off.

Write to Base +0

Bit Position	D7	D6	D5	D4	D3	D2	D1	D0
Output Controlled	OUT7	OUT6	OUT5	OUT4	OUT3	OUT2	OUT1	OUT0

Write to Base +4

Bit Position	D7	D6	D5	D4	D3	D2	D1	D0
Output Controlled	OUT15	OUT14	OUT13	OUT12	OUT11	OUT10	OUT9	OUT8

For example, if bit D5 is turned on by writing hex DF to the base address, then the FET that is controlled by OUT5 is turned ON, switching the supply voltage (VBB5) to the + Output (OUT5+). All other outputs would be off (high-impedance) between the supply voltage and the output terminals.
Reading from +0 or +4 returns the last written byte.

PROGRAMMING EXAMPLES

No complex driver software is provided with the board because programming is very simple and can be accomplished most efficiently using direct I/O instructions in the language that you are using. The following examples are in C but are readily translated into other languages:
Example: Turn on OUT0 and OUT7, turn all other bits off.
- Base=0x300; outportb(Base, 0x7E); //Base I/O address
Example: Read the isolated digital inputs
- Y=inportb(Base+1); //isolated digital input register, bits 0-7

Refer to ACCES32 and WIN32IRQ software directories for Windows drivers and utilities.
Refer to the Linux directory on the CD for Linux drivers, utilities, and samples.

CONNECTOR PIN ASSIGNMENTS

Chapter 6: CONNECTOR PIN ASSIGNMENTS

PIN	NAME	FUNCTION
1	VBB15	Bit 15 FET Supply Voltage
2	OUT15-	Bit 15 Power Supply Return (or Ground)
3	OUT15+	Bit 15 Switched (Supply Voltage) Output
4	VBB14	Bit 14 FET Supply Voltage
5	OUT14-	Bit 14 Power Supply Return (or Ground)
6	OUT14+	Bit 14 Switched (Supply Voltage) Output
7	VBB13	Bit 13 FET Supply Voltage
8	OUT13-	Bit 13 Power Supply Return (or Ground)
9	OUT13+	Bit 13 Switched (Supply Voltage) Output
10	VBB12	Bit 12 FET Supply Voltage
11	OUT12-	Bit 12 Power Supply Return (or Ground)
12	OUT12+	Bit 12 Switched (Supply Voltage) Output
13	VBB11	Bit 11 FET Supply Voltage
14	OUT11-	Bit 11 Power Supply Return (or Ground)
15	OUT11+	Bit 11 Switched (Supply Voltage) Output
16	VBB10	Bit 10 FET Supply Voltage
17	OUT10-	Bit 10 Power Supply Return (or Ground)
18	OUT10+	Bit 10 Switched (Supply Voltage) Output
19	VBB9	Bit 9 FET Supply Voltage
20	OUT9-	Bit 9 Power Supply Return (or Ground)
21	OUT9+	Bit 9 Switched (Supply Voltage) Output
22	VBB8	Bit 8 FET Supply Voltage
23	OUT8-	Bit 8 Power Supply Return (or Ground)
24	OUT8+	Bit 8 Switched (Supply Voltage) Output
25
26
27	VBB7	Bit 7 FET Supply Voltage
28	OUT7-	Bit 7 Power Supply Return (or Ground)
29	OUT7+	Bit 7 Switched (Supply Voltage) Output
30	VBB6	Bit 6 FET Supply Voltage
31	OUT6-	Bit 6 Power Supply Return (or Ground)
32	OUT6+	Bit 6 Switched (Supply Voltage) Output
33	VBB5	Bit 5 FET Supply Voltage
34	OUT5-	Bit 5 Power Supply Return (or Ground)
35	OUT5+	Bit 5 Switched (Supply Voltage) Output
36	VBB4	Bit 4 FET Supply Voltage
37	OUT4-	Bit 4 Power Supply Return (or Ground)
38	OUT4+	Bit 4 Switched (Supply Voltage) Output
39	VBB3	Bit 3 FET Supply Voltage
40	OUT3-	Bit 3 Power Supply Return (or Ground)
41	OUT3+	Bit 3 Switched (Supply Voltage) Output
42	VBB2	Bit 2 FET Supply Voltage
43	OUT2-	Bit 2 Power Supply Return (or Ground)
44	OUT2+	Bit 2 Switched (Supply Voltage) Output
45	VBB1	Bit 1 FET Supply Voltage
46	OUT1-	Bit 1 Power Supply Return (or Ground)
47	OUT1+	Bit 1 Switched (Supply Voltage) Output
48	VBB0	Bit 0 FET Supply Voltage
49	OUT0-	Bit 0 Power Supply Return (or Ground)
50	OUT0+	Bit 0 Switched (Supply Voltage) Output

FET outputs are connected from the board via a 50-pin HEADER type connector named P1. The mating connector is an IDC type with 0.1 inch centers or equivalent. The wiring may be directly from the signal sources or may be on ribbon cable from screw terminal accessory boards. Pin assignments are as depicted on the previous page.
Isolated Inputs are connected to the board via a 34-pin HEADER type connector named P2. The mating connector is an IDC type with 0.1 inch centers or equivalent.

PIN	NAME	FUNCTION
1	IIN0 A	Isolated Input 0 A
2	IIN0 B	Isolated Input 0 B
3	IIN1 A	Isolated Input 1 A
4	IIN1 B	Isolated Input 1 B
5	IIN2 A	Isolated Input 2 A
6	IIN2 B	Isolated Input 2 B
7	IIN3 A	Isolated Input 3 A
8	IIN3 B	Isolated Input 3 B
9	IIN4 A	Isolated Input 4 A
10	IIN4 B	Isolated Input 4 B
11	IIN5 A	Isolated Input 5 A
12	IIN5 B	Isolated Input 5 B
13	IIN6 A	Isolated Input 6 A
14	IIN6 B	Isolated Input 6 B
15	IIN7 A	Isolated Input 7 A
16	IIN7 B	Isolated Input 7 B
17
18
19	IIN8 A	Isolated Input 8 A
20	IIN8 B	Isolated Input 8 B
21	IIN9 A	Isolated Input 9 A
22	IIN9 B	Isolated Input 9 B
23	IIN10 A	Isolated Input 10 A
24	IIN10 B	Isolated Input 10 B
25	IIN11 A	Isolated Input 11 A
26	IIN11 B	Isolated Input 11 B
27	IIN12 A	Isolated Input 12 A
28	IIN12 B	Isolated Input 12 B
29	IIN13 A	Isolated Input 13 A
30	IIN13 B	Isolated Input 13 B
31	IIN14 A	Isolated Input 14 A
32	IIN14 B	Isolated Input 14 B
33	IIN15 A	Isolated Input 15 A
34	IIN15 B	Isolated Input 15 B

SPECIFICATIONS

Chapter 7: SPECIFICATIONS

ISOLATED DIGITAL INPUTS

Number of inputs: Sixteen
Type: Non-polarized, optically isolated from each other and from the computer. (CMOS compatible)

Voltage Range: 3 to 31 DC or AC (40 to 10000 Hz)
Isolation: 500V*(see note) channel-to-ground or channel-to channel
Input Resistance: 1.8K ohms in series with opto coupler

Response Time: 4.7 mSec w/filter, 10 uSec w/o filter (typical)
Interrupts: Software controlled with jumper IRQ selection (model 104-IDIO-16 o

ISOLATED FET OUTPUTS

Number of outputs: Sixteen Solid State FET’s (off @ power up)
Output Type: High Side Power MOSFET Switch. Protected against short circuit, over-temperature, ESD, can drive inductive loads.
Voltage Range: 5-34VDC recommended (customer supplied) for continuous use, 40VDC absolute maximum

Current Rating: 2A maximum
Leakage Current: 5μA maximum
Turn-on time: Rise time: 90usec (typical)

Turn-off time: Fall time: 110usec (typical)

INTERRUPTS: Interrupts are generated when isolated inputs change state if enabled by software. (basic model only)

POWER REQUIRED: +5VDC @ 0.150A (all FET’s ON)

ENVIRONMENTAL

Operating Temp: 0o to +70oC (optional extended operating temp -40 to +85oC)
Storage Temp: -40 to +85 °C

Notes on Isolation

Opto-Isolators, connectors,s and FETs are rated for at least 500V, but isolation voltage breakdowns will vary and are affected by factors like cabling, spacing of pins, spacing between traces on the PCB, humidity, dust, and other environmental factors. This is a safety issue so a careful approach is required. For CE certification, isolation was specified at 40V AC and 60V DC. The design intention was to eliminate the influence of common mode. Use proper wiring techniques to minimize voltage between channels and to ground. For example, when working with AC voltages, do not connect the hot side of the line to an input. The minimum spacing found on the isolated circuits of this board is 20 mills. Tolerance of higher isolation voltage can be obtained on request by applying a conformal coating to the board

Customer Comments

If you experience any problems with this manual or just want to give us some feedback, please email us at: manuals@accesio.com. Please detail any errors you find and include your mailing address so that we can send you any manual updates.

10623 Roselle Street, San Diego CA 92121
Tel. (858)550-9559 FAX (858)550-7322
www.accesio.com

FAQ

Q: What should I do if equipment failure occurs?

A: In case of equipment failure, contact ACCES for prompt service and support. The warranty covers repair or replacement of defective units.

Q: How can I ensure the safety of my I/O board?

A: Always connect and disconnect field cabling with the computer power off. Never install a board with the computer or field power on to prevent damage and voiding warranties.

Documents / Resources

ACCES IO 104-IDIO-16 Isolated Digital Input Fet Output Board [pdf] User Manual
104-IDIO-16, 104-IDIO-16 Isolated Digital Input Fet Output Board, Isolated Digital Input Fet Output Board, Digital Input Fet Output Board, Fet Output Board, Output Board

References

User Manual

ACCES IO 104-IDIO-16 Isolated Digital Input Fet Output Board

Product Information

Product Usage Instructions