Main Processor Indicators
173
Chapter 5
Fault and Alarm Indicators
MP Communication Indicators
The MP communication indicators identify the type of communication occurring
on the controller. The TX light indicates the MP is transmitting a message and the
RX light indicates the MP is receiving a message.
I
⁄
O Bus
Comm Bus
Serial
TriStation
RX/TX
RX/TX
RX/TX
Link
RX/TX
Description
Green
blinking
—
1
—
—
—
Normal response. MP is polling and
sending responses to the I
⁄
O modules.
—
Green
blinking
—
—
—
Normal response. MP is polling and
sending responses to the CM modules.
—
—
Green
blinking
—
—
Normal response. MP is polling and
sending responses to the Modbus master.
—
—
—
Green
steady
Green
blinking
MP is communicating with TriStation.
—
—
—
No
light
—
MP is not communicating with TriStation
or a network hub.
Note: The hub or Ethernet card in the
TriStation computer has a link indicator
that shows whether a hardware connection
has been established with the MP.
1. This symbol ( — ) means the indicator is not important for this condition.
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