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MCE
Executes the program between the master control relay MC (see page 1007) and master control
Description
relay end MCE 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 MCE (see page 1328)
PLC types
Data types
Variable
Data type
constant
Num*
In this example, the progamming language Instruction List (IL) is used.
Example
IL
Master control relay end
Function
Constant number that must correspond to MC number, both
of which delimit a "nested" program that is not executed
LD
start
(* EN = start; Starting signal for the MC/MCE function.
*)
MC
1
(* 1 = Num* *)
(* ... *)
(* Execute or execute not this program part. *)
(* ... *)
MCE
1
(* 1 = Num* *)
Program execution control instructions
1009
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