Master Control (End)

Instruction Parameters

XPnA/1R	XPnB	XPnE	XPnF	CP3A/B/P/U CP4A~D/U	CPnE	CPnF	BP	PLC-S
✓	✓	✓	✓	✓	✓	✓	✓	✓

	M	X	Y	K	L	F	T	C	S	Z	R	Q	D	@D	Constant
n	-	-	-	-	-	-	-	-	-	-	-	-	-	-	✓

Steps
1

Operand	Description
n	The only operand. Entries are only constants. This is the identifier for the end of the master control area. If nesting master control, the value range is 0 ~ 7.

A compile error will occur when the number of nests, n, is greater than 8.

Instruction Behavior

The MCR instruction behaves as follows:

MCR n indicates the end of the master control area.
MCR recovers from the master control and starts the process of scanning the program from the next step.
Identical nesting numbers, n, of MC and MCR are used as a set.
MCR with the lowest nesting number can terminate all master controls when:
- MCR instructions are nested in one place.
- There may be MC instructions with higher nesting numbers, n, within the MC ~ MCR area with the lowest nesting number, n.

Master Control is defined as a control area within the ladder logic for executing certain parts of the ladder logic code.
Master Control will execute from MC n through MCR n where n is a constant.
If MC ~ MCR instructions are nested in other MC ~ MCR, the nesting number, n, is available from lower to higher with the MC instruction and higher to lower with the MCR instruction.
- Please refer to Master Control Example 1.
MCR with the lowest nesting number can terminate all master controls when:
- MCR instructions are nested in one place.
- There may be MC instructions with higher nesting numbers, n, within the MC ~ MCR area with the lowest nesting number, n.