Mitsubishi Electric MELSEC iQ-R Series Manual page 17

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