Rockwell Automation T3151 ICS Regent Real time Clock Communications Modules - Manual (Page 5)

Real-Time Clock Communications Modules (T3151)
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Failures result in a COMM module error indication at the
processor modules and an RTC/COMM error at the
communications module.
Front Panel
Figure 2 shows the physical features of the real-time clock
communications modules. The front panel of each module
contains indicators showing overall module health, transmit
and receive status, and backup battery power. In addition to
the front panel indicators, each real-time clock
communications module has two DB-25 serial ports.
RTC/COMM Indicator
This red and green LED pair indicates the overall health of
the module. During normal operation the green LED is on. If
a module fault occurs the red LED turns on and the green
LED turns off.
Transmit/Receive Indicators
These green LEDs are connected directly to the RS-232 signal
lines and flash while data are being transmitted or received.
The TX LED flashes as data are sent from the module, and
the RX LED flashes as data are received by the module.
Battery Status Indicator
This green LED is on when the battery is good and the
module is installed in the controller chassis and is receiving
power. This LED turns off if power is removed from the
module, or if the battery runs low.