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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