ABB Triguard SC300E MSR04XI

Triguard SC300E

MSR04XI

Serial Communications Module

RS232

The Serial Communications Module provides a serial interface between the SC300E

environment and a variety of remote devices complying with the standard RS232-C.  At least

one Serial Communications Module must be used in the system and fitted in Slot 10 of the

main chassis to enable communications between the system processors and the

workstations.  The workstation link is used for loading the application software and monitoring

ladder and diagnostic functions.  The link utilises Port 0 of the module.  Additional modules can

be fitted to any other I/O slot, ‘wrong slotting’ is prevented by mechanical coding blocks (Figure

2-1 ).  The system software identifies the module via a built-in hardware identifier.

Circuit triplication and voting procedures make the module single fault tolerant and front panel

indicators show Tx/Rx activity, the circuit on-line status and the health of the module.

Communications connections are via four identical ports on the front panel (Ports 0 to 3) and

these connections are duplicated on the field connector (J2) at the rear.  A fifth port is for

diagnostic purposes only.  The module is compatible with ‘single slot hot repair’ and the front

panel has a switch to enable a request that the module be taken off line.

This document is intended to provide a general understanding of the function of Serial

Communications Module, sufficient to enable basic maintenance operations to be effected in

the field.

Triguard SC300E 

ENVIRONMENTAL SPECIFICATIONS 

The maximum ambient temperature measured at the hottest point within the Triguard system 

shall not be greater than 60 degrees centigrade. 

Temperature operating: 

Temperature storage: 

Humidity 

EMC/RFI Immunity 

Vibration/Shock 

Certification: 

+5°C to +60°C -25°C to +70°C 

5% to 95% non-condensing at ambient <40°C 

Tested and certified to IEC 1131-Part 2 1994 

Tested and certified to IEC 1131-Part 2 1994 

General Certification: Ref. SC300E Product Guide (ref 008-5209) 

 PHYSICAL 

The Serial Communications Module is a 9U high PCB with integral front panel and front and 

rear connectors; a plug-in daughter board carries the RS232 interface circuits. Figure 1-1

 shows the general layout, location of the connectors and front panel components. 

Mechanical coding blocks 

All Input/Output modules carry two mechanical coding blocks equipped with pins which mate 

with holes in corresponding blocks in the chassis and prevent the module being inserted into 

the wrong slot. The pins in the module blocks are factory installed in a pattern determined by 

the module and corresponding set screws are removed from the chassis coding blocks to 

enable fitting. Unused holes are plugged with set screws.