Honeywell GLAC20A1B

The System 57 MODBUS Interface provides a facility for digital

communication between the System 57 Control System and an external

computer system. 

Description:

MODBUS is a well supported digital data

communication protocol which provides a set of standard commands

by which system data can be communicated. Two different interface

modules are available to support the most widely used electrical

interface standards, thereby ensuring compatibility with most external

systems. Using the MODBUS Interface it is possible to read

configuration, alarm status and other information from any channel in

the rack and to perform calibration and other procedures.

The MODBUS Interface is commonly used to connect the System 57

Control System to plant control systems to provide central monitoring

of system status often with graphical display.

The principal features of the MODBUS Interface are:

Easily fitted to the Engineering Card.

Compatible with 5701, 5704 and 5704F Control Cards.

Simple field connections, via the DC Input Card terminal block, for

wire up to 2.5mm² (14 AWG).

Operates as a MODBUS RTU.

Supports functions 02, 03, 04, 06 and 16 of the MODBUS protocol.

Provides sensor gas readings and alarm status for Fault, Inhibit,

A1, A2, A3, FIRE, STEL, LTEL and Rate alarms from all channels

in the rack.

Supports commands to Inhibit, Reset, Normalise (zero), Calibrate

(span) and set Alarm Levels for all channels in the rack.

Supports RS485, RS422 and RS232 electrical standards.

Data signals isolated from System 57 power supply.

Asynchronous serial link configurable for baud rate, parity and stop

bits.

Primary and secondary channel operation.

Half duplex operation.

Multi-drop capability.

Easily configured using Engineering Interface Software.

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