• Another master control instruction (MC, MCE)
set can be programmed between one master
control instruction set as shown on the right. This
construction is called “nesting”.
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5-3. Description of Basic Instructions
1. When programming DF and DF/ instructions in the master control instruction set:
The DF and DF/ instructions remember their trigger state (ON or OFF) just before the trigger of the MC
instruction turns OFF while the master control instruction set is in the OFF state.
Be sure to pay attention to the following when the DF and DF/ instructions are programmed.
2. The MC instruction cannot be started directly from the bus line. Be sure to include a contact input before
the MC instruction in your program.
3. The program cannot be executed in the following
conditions:
- The trigger of the MC instruction is missing.
- There are two or more master control instruction
sets with the same number.
- The order of the MC and MCE instructions are
reversed.
• Trigger to the DF or DF/ instruction between the
MC and MCE instruction set is ignored while
the MC trigger is OFF.
• If, in the example above, output is required at
point A , place the DF or DF/ instruction outside
the MC and MCE instruction set.
• If the same trigger is set for the MC and for the
DF or DF/ instruction, there will be no output.
Place the DF or DF/ instruction outside the MC
and MCE instruction set when output is
required.
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