GE 90-30 PLC Series Installation And Hardware Manual page 181

Status LEDs
The LEDs on the front of the GCM module indicate its operating status and should be on during
normal operation.
OK
COM
Figure 8-2. Genius Bus Wiring Schematic
Figure 8-3. Example of Genius Communications Network
GCM Documentation
For detailed information on the Genius Communications Module, including installation
instructions, refer to GFK-0412, the Series 90-30 Genius Communications Module User's Manual.
GFK-0356Q Chapter 8 Option Modules
Shows the status of the GCM module. This LED turns on after power up diagnostics are
completed.
Shows the status of the Genius communications bus. This LED is on steadily when the bus
is operating properly. It blinks for intermittent bus errors and is off for a failed bus. It is
also off when no configuration has been received from the PLC CPU.
FIRST
DEVICE
SERIAL
1
R SERIAL
2
SHIELD
IN
SHIELD
OUT
SERIES 90-30
C
G
C
P
M
U
GENIUS COMMUNICATIONS BUS
LAST
DEVICE
SERIAL SERIAL SERIAL
1 1 1
SERIAL SERIAL SERIAL
2 2 2
SHIELD SHIELD SHIELD
IN IN IN
SHIELD SHIELD SHIELD
OUT OUT OUT
SERIES 90-30
G
C
M
SERIES 90-70
G
B
C
8
R
8-3