CPU LED Indicators
Original instructions
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Overview
The Quantum Hot Standby CPUs has two types of indicators:
  1. LCD display screen (1)
    The default display screen serves as a controller status screen.
  2. LED indicators (2)
The following figure shows the two types of indicators: 
1
LCD display (lens cover closed) 
2
LED indicators
LED Description
The following table shows the description for the Quantum Hot Standby CPU LED indicators:
LEDs
Indication
COM
CPU is controlled by the Copro hardware, indicates Primary or Standby CPU activity
STS
CPU is controlled by the Copro firmware:
  • Blinking: system is redundant and data are exchanged between the Primary and Standby PLCs
  • ON: system not redundant / Copro booting from power-on to end of self-tests
  • OFF: Copro auto-test detected errors