■Changing a module directly
[When the system is configured using a CPU module]
Step in online module change
Checks before replacement
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 As a module is removed by means of the direct change, the CPU module enters the following state: the READY LED flashes; a module
verification error occurs; and the ERROR LED turns on. Even though the direct change is completed successfully, the module
verification error is not cleared and the ERROR LED remains on.
*5 Turning off the ERROR LED requires the error to be cleared by using the module diagnostics of the engineering tool or other means.
Change in 'Online module
*1
changing status' (SD1617)
0
0 5
5 7
7 9
9 0
LED status on CPU module
READY LED
ERROR LED
ON
OFF
ON Flashing (interval
OFF ON
of 400ms)
Flashing (interval of
ON
400ms)
Flashing (interval of
ON
400ms)
ON OFF
Flashing (interval of
400ms) ON
3 REPLACEMENT PROCEDURE
LED status on target
*3
module
*2
RUN LED
ON
*4
OFF
OFF ON
*5
ON
3.1 Specifications
3
17