Table of Contents
Advertisement
■MC
• If the execution command of the MC instruction is ON when master control is started, the result of the operation from the
MC instruction to the MCR instruction will be exactly as the instruction (ladder) shows. If the execution command of the MC
instruction is OFF, the result of the operation from the MC instruction to the MCR instruction will be as shown below:
Device
High speed timer
Low speed timer
High speed retentive timer
Low speed retentive timer
Counter
Devices in OUT instruction
Devices in SET instruction or RST instruction
Devices in SFT instruction
Devices in Basic instruction or Application instruction
• Even when the MC instruction is OFF, instructions from the MC instruction to the MCR instruction will be executed, so scan
time will not be shortened.
When a ladder with master control contains instructions that do not require any contact instruction (such as
FOR to NEXT, EI, DI instructions), the CPU module executes these instructions regardless of the ON/OFF
status of the MC instruction execution command.
• By changing the device designated by (D), the MC instruction can use the same nesting (N) number as often as desired.
• Coils from devices designated by (D) are turned ON when the MC instruction is ON. Further, using these same devices with
the OUT instruction or other instructions will cause them to become double coils, so devices designated by (D) should not
be used within other instructions.
■MCR
• This is the instruction for recovery from the master control, and indicates the end of the master control range of operation.
• Do not place contact instructions before the MCR instruction.
• Use the MC instruction and MCR instruction of the same nesting number as a set.
However, when the MCR instructions are nested in one place, all master controls can be terminated with the lowest nesting
(N) number.
Operation error
• There is no operation error in the MC or MCR instruction.
5 SEQUENCE INSTRUCTIONS
174
5.5 Master Control Instructions
Device status
Count value goes to 0, coils and contacts all go OFF.
Coils go OFF, but counter values and contacts all maintain current status.
All turned OFF
Maintain current status
Advertisement
Table of Contents
