Mitsubishi Electric Melsec Q Series User Manual page 170

6
PARAMETER SETTING
(3) Error codes for the operation mode change failure
(4) Precautions when changing the operation mode
6
- 5 6.2 Operation Mode Setting
If the operation mode change is unsuccessfully completed, an error code is stored in
the Operation mode change result area (Un\G2256) on the QJ71PB92V.
For error codes, refer to Section 9.5.2.
(a) When the operation mode change is attempted during I/O data exchange
When the operation mode change is attempted during I/O data exchange, the
QJ71PB92V stops I/O data exchange before changing the operation mode.
The Data exchange start completed signal (X00) turns OFF.
(b) Status in which the operation mode change is not executable
The operation mode change is not allowed while the QJ71PB92V is executing the
following processing.
Change the operation mode after the processing is completed.
If the operation mode change is attempted during execution of the following
processing, E302
H
(Un\G2256):
• Acquisition of extended diagnostic information
• Global control function
• Acyclic communication
• Alarm acquisition
• Time control function
(c) When the QJ71PB92V is mounted on a redundant system
1) Operation mode of redundant CPU
If the redundant CPU is in the Backup mode, the operation mode of the
QJ71PB92V cannot be changed.
An error code is stored in the Operation mode change result area (Un\G2256).
( Section 9.5.2)
The operation mode of the QJ71PB92V must be changed when the redundant
CPU is in Separate or Debug mode. (
system for the CPU module used)
2) Tracking transfer between redundant CPUs
Stop the tracking transfer between the redundant CPUs.
Use the special relays (SM1520 to SM1583) of the redundant CPU to stop the
tracking transfer. (
module used)
If the operation mode of the QJ71PB92V is changed without stopping the
tracking transfer, an error code may be stored in the Operation mode change
result area (Un\G2256).
3) Confirmation after operation mode change
To use the redundant CPU in Backup mode, check that the same operation
mode is active in the QJ71PB92V in system A and the one in system B.
If the mode is different between them, a malfunction may occur in system
switching.
is stored in the Operation mode change result area
User's manual for the redundant system for the CPU
User's manual for the redundant