Disabling/Enabling System Switching - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

14.2

Disabling/Enabling System Switching

DCONTSW, ECONTSW
RnPCPU
RnCPU RnENCPU
(Process)
• DCONTSW: This instruction disables manual system switching.
• ECONTSW: This instruction enables manual system switching.
Ladder
FBD/LD
EN ENO
■Execution condition
Instruction
DCONTSW
ECONTSW
Processing details
• When the DCONTSW instruction is executed in the standby system, the system switching operation in the control system is
disabled.
• When the ECONTSW instruction is executed in the standby system, the system switching operation in the control system is
enabled.
• The system switching operation in the control system is enabled by default.
• These instructions can only be executed in the standby system. Even if these instructions are executed in the control
system, no processing is performed.
To execute these instructions in the standby system in backup mode, write the instructions in a program
executed in both systems or in a POU called by a program executed in both systems. For details on executing
a program in both systems, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
14 REDUNDANT SYSTEM INSTRUCTIONS
1444
14.2 Disabling/Enabling System Switching
RnPCPU RnSFCPU RnSFCPU
(Redundant) (Standard) (Safety)
Execution condition
ST
ENO:=DCONTSW(EN);
ENO:=ECONTSW(EN);