4
Introduction
The 3000/06 Node Processor card is the Main Processing Unit (MPU), which solves user application logic,
communicates with the 3000/01 Chassis Processor cards and also host applications. It can be configured
single, dual redundant, triple redundant or quad redundant.
Two indicator LEDs are located near the top of the front panel. The left LED indicator displays the overall
health status of the card. If this LED is on, the card is functioning normally; if it is off, the card has detected
an error or is offline. The right indicator LED indicates the node processor status as shown below:
On
If left LED is On - Primary without errors
If left LED is Off - WWDT/WDT expires, Board/CPU temperature is > 90
degrees Celsius, or expiration of 2-0 Tolerance Time
1 Blink
Primary with chassis/card error or forced read-only variable
2 Blinks
Redundant without errors
3 Blinks
Redundant with chassis/card error or forced read-only variable
4 Blinks
Bootloader mode
6 Blinks
Offline (Insufficient I/O communication links)
Off
No valid program loaded
If the left LED on the top is off and the right LED on the top is on, then the windowed watchdog timer on
the node processor is expired due to an error (node is running faster or slower than it is configured in
WWDT) or Board/CPU temperature was higher than temperature defined in node processor shutdown
object or 2-0 Tolerance Time, defined in node processor shutdown object, is expired. 2-0 Tolerance time
should be configured only when you operate the SIS with redundant Node Processors. Setting a non-zero
value (between 0.01 seconds and 327.67 seconds) enables the SIS to start the Elapsed timer; when it is
Latched true in redundant mode (more than one node processor had come on line and operational) and
only one Node Processor is left online and operational. If successful redundant Node Processor operation
is not established within the 2-0 Tolerance Time, the remaining Node Processor CPU is turned off,
