LED status
The following shows each LED status indicated at each step in online module change.
■Changing a module by controlling special relays and special registers
[When the system is configured using a CPU module]
Step in online module change
Checks before replacement
Module selection
Module change activation
Module removal
Module mounting
Module recognition
Module control start
*1 The status of online module change is stored.
0: Normal operation
1: Module selection in progress
2: Module selection completion
3: Module removal in preparation
4: Module removal ready
5: Module removal completion
6: Module mounting completion
7: Module recognition in progress
8: Module recognition completion
9: Module control resumption in progress
*2 If a continuation error (the ERROR LED turns on) has occurred before online module change, the ERROR LED remains on during the
module change.
*3 A failure in the module can cause the status to be different from the description above.
*4 A failure in the module can result in Module removal completion (5) instead of Module removal ready (4).
Change in 'Online module
*1
changing status' (SD1617)
0
0 1 2
*4
2 3 4
4 5
5 6
6 7 8
8 9 0
LED status on CPU module
READY LED
ERROR LED
ON
OFF
ON Flashing (interval
OFF
of 400ms)
Flashing (interval of
OFF
400ms)
Flashing (interval of
OFF
400ms)
Flashing (interval of
OFF
400ms)
Flashing (interval of
OFF
400ms)
Flashing (interval of
OFF
400ms) ON
3 REPLACEMENT PROCEDURE
LED status on target
*3
module
*2
RUN LED
ON
ON Flashing (interval of
400ms)
Flashing (interval of 400ms)
OFF
OFF
OFF ON
ON
3.1 Specifications
3
15