User Manual PLC-3 BACKUP CONC(OR.DU1 Owner's manual

Diagnosing Faults
Chapter 6
6-3
Figure 6.1
Processor
Front Panel
10921
PROCESSOR
OUTPUTS
PROGRAM
ACCESS
Table 6.A
Status Indicators for Primary Processor
Indicator Status Description
PROCESSOR GREEN Primary processor is active (normal operation)
RED Major fault occurred
OFF Power is off in the primary processor
OUTPUTS GREEN Outputs enabled
RED Outputs disabled or major fault*
OFF Not used
PROGRAM GREEN Primary processor is in program load mode
RED Major fault*
OFF Primary processor is not in program load mode
ACCESS GREEN A peripheral device is connected to a peripheral
communication channel and is online (channel active).
RED A peripheral device is editing the program or major fault
1
OFF No peripheral communication channels are active.
1. When automatic switchover is selected, a major fault will turn all four status indicators red.