Diagnosing faults chapter 6 – Rockwell Automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CONC(OR.DU1 User Manual
Page 107
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 onĆline (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.