Raychem Elexant 450c-Modbus Protocol Interface Mapping
Firmware version V2.1.1
The Raychem Elexant 450c-Modbus controller is designed for use with Modbus systems, allowing integration with Distributed Control Systems (DCS) or Building Management Systems (BMS). This manual provides a comprehensive mapping of its Modbus registers, enabling system integrators to monitor, configure, and manage the controller remotely.
1. Introduction
This manual details the Modbus registers of the Raychem Elexant 450c-Modbus. It is intended for system integrators who wish to interface their external devices (e.g., DCS or BMS systems) using the Modbus protocol. The manual includes details on the system's current configuration, available resources, set-up parameters, current conditions, alarm status, log information, and numerous other fixed and variable data points.
1.1 How to Use This Manual
The Elexant 450c-Modbus register can be accessed by DCS or BMS systems. This should only be performed by expert users familiar with the system's semaphore fields, which ensure synchronization between multiple users and prevent conflicting instructions. The Modbus register map provides access to current set-up and real-time measured values. It allows for easy reading of current conditions, data for trending, alarm status, and alarm threshold/setpoint settings without risking system performance.
This document includes the complete Modbus register map. While most Modbus host devices can write to the database, it is strongly recommended that system integrators thoroughly test their systems to ensure proper operation and prevent unintended consequences.
1.2 Modbus Communications
The controller functions as a Modbus slave device, allowing a Modbus master device to read from and write to it. This facilitates remote monitoring, configuration, and alarm viewing. The protocol used is Modbus RTU via RS485.
| Variable | Description | Default | Range/options |
|---|---|---|---|
| Address | Modbus Station Address used to identify the controller. | 1 | 1 to 247 |
| Baud | The data rate at which communications occur on the serial network. | 9600 | 2400, 4800, 9600, 19200 |
| Parity | Parity defines the type of parity bit to be used with any of the three serial communications ports. | None | None, Odd, Even |
| Stop Bits | Defines the number of stop bits used with any of the three serial communications ports. | 1 | 1, 2 |
The host defaults are:
- Modbus Address: 1
- Baud Rate: 9600
The standard configuration is: 8 data bits, no parity, and one stop bit.
The dip switches (located below terminals 26 and 27) control resistors:
- 1 - Pull down resistor
- 2 - Pull up resistor
- 3 - Termination resistor
Pushing the button to the ON position connects the corresponding resistor.
[Diagram showing dip switches labeled 1, 2, 3 with an arrow indicating the ON position]
2. Modbus Register Map
2.1 Alarm Status Coils
Modbus Function Code: 1
Modbus Start Address: 0
Modbus Block Size: 17
Number of Blocks: 1
| Description | Modbus Address | Function | Comments |
|---|---|---|---|
| High TS 1 Alarm | 0 | 1 | 0 = no alarm, 1 = alarm |
| Low TS 1 Alarm | 1 | 1 | 0 = no alarm, 1 = alarm |
| TS 1 Failure | 2 | 1 | 0 = no alarm, 1 = alarm |
| High TS 2 | 3 | 1 | 0 = no alarm, 1 = alarm |
| Low TS 2 | 4 | 1 | 0 = no alarm, 1 = alarm |
| TS 2 Failure | 5 | 1 | 0 = no alarm, 1 = alarm |
| Internal Error | 15 | 1 | 0 = no internal error, 1 = internal error |
| Panel Alarm status | 16 | 1 | 0 = no alarm, 1 = alarm |
2.2 Controller Setup Parameters
Modbus Function Code: 1, 5, 15
Modbus Start Address: 145
Modbus Block Size: 9
Number of Blocks: 1
| Description | Modbus Address | Function | Comments |
|---|---|---|---|
| TS1 Fail Mode | 145 | 1, 5, 15 | 0 = Fail off, 1 = Fail on |
| TS2 Fail Mode | 146 | 1, 5, 15 | 0 = Fail off, 1 = Fail on |
| Test Program | 147 | 1, 5, 15 | 0 = no, 1 = yes, test program is running |
| Alarm Buzzer | 148 | 1, 5, 15 | 0 = no, buzzer off; 1 = yes, buzzer on |
| TS1 high alarm feature off | 149 | 1, 5, 15 | 0 = alarm active, 1 = alarm deactive |
| TS1 high alarm feature off | 150 | 1, 5, 15 | 0 = alarm active, 1 = alarm deactive |
| TS1 low alarm feature off | 151 | 1, 5, 15 | 0 = alarm active, 1 = alarm deactive |
| TS1 low alarm feature off | 152 | 1, 5, 15 | 0 = alarm active, 1 = alarm deactive |
| Panel Alarm Control | 153 | 1, 5, 15 | 0 = alarm deactive, 1 = alarm active |
2.3 Controller Status
Modbus Function Code: 2
Modbus Start Address: 3
Modbus Block Size: 3
Number of Blocks: 1
| Description | Modbus Address | Function | Comments |
|---|---|---|---|
| Raw Switch Output 1 | 3 | 2 | 0 = HC1 relay off, 1 = HC1 relay on |
| Keylock Status | 4 | 2 | 0 = no, 1 = yes, locked |
| Raw Switch Output 2 | 5 | 2 | 0 = HC2 relay off, 1 = HC2 relay on |
2.4 INPUT Parameters
Modbus Function Code: 3, 6, 16
Modbus Start Address: 0
Modbus Block Size: 20
Number of Blocks: 1
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Control Temperature Setpoint 1 | 0 | 3, 6, 16 | 0°C to 80°C (0°C to 245°C for PT100) | °C | 10ths |
| PASC Minimum Pipe Size 1 | 1 | 3, 6, 16 | 10, 15, 20, 25, 32, 40, 50, 60, 70, 80, 100, 125; if invalid value 25 is used | DN | 1 |
| Switch Control Mode | 2 | 3, 6, 16 | 4 = Line/Line, 5 = PASC/PASC, 6 = Line/PASC, 7 = PASC/Line, 8 = Line/OFF, 9 = PASC/OFF, 10 = OFF/Line, 11 = OFF/PASC, 12 = OFF/OFF | - | 1 |
| Deadband 1 | 3 | 3, 6, 16 | 1.0°C to 5°C | °C | 10ths |
| PASC Minimum Ambient Temperature 1 | 4 | 3, 6, 16 | -40°C to 0°C | °C | 10ths |
| PASC Minimum Pipe Size 1 | 5 | 3, 6, 16 | 10, 15, 20, 25, 32, 40, 50, 60, 70, 80, 100, 125; if invalid value 25 is used | DN | 1 |
| PASC Power Adjust | 6 | 3, 6, 16 | 70, 80, 90, 100, 110, 120, 130, 140 | % | 1 |
| Sensor Setup | 7 | 3, 6, 16 | bit 1 = TS 1 assign for Circuit 1; bit 2 = TS 2 assign for Circuit 1; bit 5 = TS 1 assign for Circuit 2; bit 6 = TS 2 assign for Circuit 2; bit 0,3,4,7 = NA | - | 1 |
| Language | 8 | 3, 6, 16 | 0 = No (No select); 1 = Yes (Select); 0 = DANISH, 1 = GERMAN, 2 = DUTCH, 3 = ENGLISH, 4 = FRENCH, 5 = ITALIAN, 6 = SWEDISH, 7 = NORWEGIAN, 8 = FINNISH, 9 = RUSSIAN, 10 = CZECH, 11 = POLISH | - | 1 |
* Temperature displayed in 1/10th of °C (example: 10°C = 100)
2.4.1 Country Settings
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Country | 9 | 3, 6, 16 | 0 = GERMANY, 1 = AUSTRIA, 2 = SWITZERLAND, 3 = UK, 4 = FRANCE, 5 = ITALY, 6 = POLAND, 7 = CZECH_REPUBLIC, 8 = DENMARK, 9 = BELGIUM, 10 = RUSSIA, 11 = CHINA, 12 = JAPAN, 13 = SWEDEN, 14 = NORWAY, 15 = LITHUANIA, 16 = SLOVAKIA, 17 = NETHERLANDS, 18 = FINLAND, 19 = IRELAND | - | 1 |
2.4.2 Cable Type Settings
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Cable type 1 | 10 | 3, 6, 16 | 0 = 10XL2_ZH, 1 = 15XL2_ZH, 2 = 26XL2_ZH, 3 = 31XL2_ZH, 4 = FS_C10_2X, 5 = OTHER | - | 1 |
| Cable type 2 | 11 | 3, 6, 16 | 0 = 10XL2_ZH, 1 = 15XL2_ZH, 2 = 26XL2_ZH, 3 = 31XL2_ZH, 4 = FS_C10_2X, 5 = OTHER | - | 1 |
2.4.3 Deadband 2
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Deadband 2 | 12 | 3, 6, 16 | 1.0°C to 5°C | °C | 10ths |
2.4.4 Date and Time Settings
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Date-Year | 13 | 3, 6, 16 | 00-99 | year | 1 |
| Date-Month | 14 | 3, 6, 16 | 1-12 | month | 1 |
| Date-Day | 15 | 3, 6, 16 | 1-31 | day | 1 |
| Time-Hour | 16 | 3, 6, 16 | 0-23 | hour | 1 |
| Time-Minute | 17 | 3, 6, 16 | 0-59 | minute | 1 |
2.4.5 Control Temperature Setpoint 2
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Control Temperature Setpoint 2 | 18 | 3, 6, 16 | 0°C to 80°C (0°C to 245°C for PT100) | °C | 10ths |
2.4.6 PASC Minimum Ambient Temperature 2
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| PASC Minimum Ambient Temperature 2 | 19 | 3, 6, 16 | -40°C to 0°C | °C | 10ths |
* Temperature displayed in 1/10th of °C (example: 10°C = 100)
2.5 Temperature Sensor Parameters
Modbus Function Code: 3, 6, 16
Modbus Start Address: 20
Modbus Block Size: 4
Number of Blocks: 1
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| High TS 1 Alarm Setpoint | 20 | 3, 6, 16 | 2°C - 90°C (2°C to 250°C for PT100) | °C | 10ths |
| Low TS 1 Alarm Setpoint | 21 | 3, 6, 16 | -40°C - 78°C (-40°C to +245°C for PT100) | °C | 10ths |
| High TS 2 Alarm Setpoint | 22 | 3, 6, 16 | 2°C - 90°C (2°C to 250°C for PT100) | °C | 10ths |
| Low TS 2 Alarm Setpoint | 23 | 3, 6, 16 | -40°C - 78°C (-40°C to 245°C for PT100) | °C | 10ths |
* Temperature displayed in 1/10th of °C (example: 10°C = 100)
** Can be disabled through section 2.2
2.6 Override
Modbus Function Code: 3, 6, 16
Modbus Start Address: 34
Modbus Block Size: 2
Number of Blocks: 1
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Remote Override Status 1 | 34 | 3, 6, 16 | 0 = Override not active; 1 = Force on Override active; 2 = Force off Override active | - | - |
| Remote Override Status 2 | 35 | 3, 6, 16 | 0 = Override not active; 1 = Force on Override active; 2 = Force off Override active | - | - |
2.7 Controller's Identification Tag
Modbus Function Code: 3, 6, 16
Modbus Start Address: 90
Modbus Block Size: 10
Number of Blocks: 1
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Controller's Identification Tag | 90 to 99 | 3, 6, 16 | Letters (A-Z), numbers (0-9), /.()_-# Two characters per address. String terminators = Null or space. Note: LSByte of 99 is always Null. Input the ascii code for the characters above, for example, input 0x4142 (Hex or 16706 in Dec) for register 90, and 0x3031 (in Hex or 12337 in Dec) for register 91, then the controller ID will be AB01. | - | - |
2.8 Console Parameters
Modbus Function Code: 3, 6, 16
Modbus Start Address: 120
Modbus Block Size: 2
Number of Blocks: 1
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Keylock Passcode | 120 | 3, 6, 16 | 1 to 9999: Incorrect passcode input will be ignored, and correct input will be valid for 2 minutes. (used to enter the code to unlock access to register 121) | - | - |
| Lock Enable/Disable | 121 | 3, 6, 16 | 0 = Keylock inactive, 1 = Keylock active | - | - |
2.9 Temperature Sensor Parameters
Modbus Function Code: 3, 6, 16
Modbus Start Address: 147
Modbus Block Size: 1
Number of Blocks: 1
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Communications Activity Time-out | 147 | 3, 6, 16 | Used for load shedding and remote override 0-255 | sec | 1 |
2.10 General Controller Information
Modbus Function Code: 4
Modbus Start Address: 0
Modbus Block Size: 4
Number of Blocks: 1
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Device Type | 0 | 4 | Fixed value = 450 | - | 1 |
| Firmware Version 1 | 1 | 4 | Firmware Version-Major 0-255 | - | 1 |
| Firmware Version 2 | 2 | 4 | Firmware Version-Minor 0-255 | - | 1 |
| Firmware Version 3 | 3 | 4 | Firmware Version-Build 0-255 | - | 1 |
2.11 Dynamic Output Status
Modbus Function Code: 4
Modbus Start Address: 50
Modbus Block Size: 15
Number of Blocks: 1
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Control Output Duty Cycle 1 | 50 | 4 | 0 = full off, 100 = full on | % | 1 |
| Tracing Control Status | 51 | 4 | 2 digits, the first for circuit 1 and the second for circuit 2 (e.g., 0 means both are normal, 15 means circuit 1 = force off, circuit 2 = force on) | - | 1 |
| PASC On-Count 1 | 52 | 4 | 0 = normal temperature control; 1 = output override force off; 2 = test program in progress; 5 = output override force on | sec | 1 |
| PASC Off-Count 1 | 53 | 4 | - | sec | 1 |
| PASC Next Switch Count 1 | 54 | 4 | - | sec | 1 |
| PASC Percent On 1 | 55 | 4 | 0 = full off, 100 = full on | % | 1 |
| PASC Output State 1 | 56 | 4 | 0 = Off, 1 = On | - | 1 |
| PASC Total Time 1 | 57 | 4 | - | sec | 1 |
| Control Output Duty Cycle 2 | 58 | 4 | 0 = full off, 100 = full on | % | 1 |
| PASC On-Count 2 | 59 | 4 | - | sec | 1 |
| PASC Off-Count 2 | 60 | 4 | - | sec | 1 |
| PASC Next Switch Count 2 | 61 | 4 | - | sec | 1 |
| PASC Percent On 2 | 62 | 4 | 0 = full off, 100 = full on | % | 1 |
| PASC Output State 2 | 63 | 4 | 0 = Off, 1 = On | - | 1 |
| PASC Total Time 2 | 64 | 4 | - | sec | 1 |
2.12 Analog Readings
Modbus Function Code: 4
Modbus Start Address: 81
Modbus Block Size: 2
Number of Blocks: 1
| Description | Modbus Address | Function | Comments | Units | Scaling |
|---|---|---|---|---|---|
| Current TS 1 Temperature | 81 | 4 | TS 1 failure = +3000.0°C; TS 1 not used = +3200.0°C | °C | 10ths |
| Current TS 2 Temperature | 82 | 4 | TS 2 failure = +3000.0°C; TS 2 not used = +3200.0°C | °C | 10ths |
* Temperature displayed in 1/10th of °C (example: 10°C = 100)
2.13 Disclaimer
MODBUS map information is proprietary and confidential. Use of this information is permitted solely to implement a communications link between customer equipment and Raychem controllers. It may not be used for any other purpose, and it is not to be disclosed to 3rd parties without the written consent of Chemelex Thermal LLC.
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