Ad693Cmm301 State Logic Serial Communications Module (Scm); Description; Ok Led; Reset Button - GE 90-30 PLC Series Installation And Hardware Manual

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AD693CMM301 State Logic Serial Communications Module (SCM)

Description

This module provides two additional serial ports for a Series 90-30 State Logic PLC System. A
model 33 or 340 State Logic CPU is required.
Figure 9-1. AD693CMM301 State Logic Serial Communications Module

OK LED

The SCM turns on its OK LED after completing its start-up internal self test procedure. The OK
LED remains ON as long as the module is functioning properly. If the OK LED turns OFF while
power is applied to the system, turn OFF PLC power and make sure the module is properly seated
in the baseplate. Turn power back ON. If the OK LED remains OFF when power comes back up,
it indicates a probable hardware failure in the SCM and it should be returned for repair. The other
two LEDs on this module are not used.

Reset Button

Pressing the Reset pushbutton when the OK LED is ON re-initializes the module. However, if the
OK LED is off (indicating a module failure), pressing the Reset button will have no effect.
9-2 Series 90-30 PLC Installation and Hardware Manual – August 2002
OK
OK
RESTART
COMBINED
SERIAL PORT
PORT1
&
PORT2
GFK-0356Q