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2-12 TCP/IP Ethernet Communications for the Series 90™ PLC User's Manual
–
May 2002 GFK-1541B
2
Verifying Proper Power-Up of the CMM321
Powering-up the Ethernet Interface
After configuring the CMM321, follow the procedure below to be sure it is operating correctly.
1. Turn power OFF to the PLC for 3–5 seconds, then turn the power back ON. This will initiate
a series of diagnostic tests.
The OK LED will blink indicating the progress of power-up.
2. The LEDs will have the following pattern upon successful power-up. At this time the
Ethernet Interface is fully operational and on-line.
LED Ethernet Interface Online
OK ON
LAN ON or blinking
FDX ON Solid if Full Duplex mode is active OFF
if Full Duplex mode is not active
STAT ON
If STAT LED is OFF, check the PLC Fault Table. Alternatively, use the Station
Manager LOG command as explained in GFK-1186,
TCP/IP Ethernet Communications
for the Series 90 PLC Station Manager Manual
.
Problems During Power-up
If a problem is detected during power-up, the CMM321 may not transition directly to the
Operational State. If the Interface does not transition to Operational, check the LED pattern on
the Interface and refer to the following diagram and table for suggestions.