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Program execution control instructions
MC
Executes the program between the master control relay MC and master control relay end MCE
Description
(see page 1008) instructions of the same number Num* only if the trigger EN is in the ON-state
When the predetermined trigger EN is in the OFF state, the program between the master control
relay MC and master control relay end MCE instructions is not executed.
A master control instruction (MC and MCE) pair may also be programmed in between another pair
of master control instructions. This construction is called "nesting".
The constant number Num* that must correspond to MC number, both of which delimit a "nested"
program that is not executed.
It is not possible to use this function in a function block POU.
The maximum possible value that can be assigned to Num* depends
on the PLC type.
Availability of MC (see page 1328)
PLC types
Data types
Variable
Data type
constant
Num*
Example LD
1008
Master control relay
Function
Constant number that must correspond to MCE number,
both of which delimit a "nested" program that is not executed
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