Subroutine Block (End)

Instruction Parameters

Supported PLC Series

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

Supported Data Registers

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

Supported Flags

Flag	Bit	Support
Error	F11.0	✓
Zero	F11.1	-
Carry	F11.2	-

Number of Steps

Steps
2

Operands

Operand	Description
n	The only operand. Entries are only constants. This is the subroutine ID. The value range is 0 ~ 127.

Notice

Subroutine Usage

The error flag, F11.0, will be ON for one scan when the address of the data register assigned by @D exceeds the range of the data register, D. The range of the data register, D, is dependent on the CPU type.
The error flag, F11.0, turns ON when the instruction is processed with a CPU type such as the BP, XPnA/1R, CP3A/B/P/U, and CP4A~D/U.

Errors will occur when the following conditions are met:

• Subroutine ID, n, exceeds the range 0 ~ 127.
• The CALL n or CALLP n instruction exists, but a corresponding SBRT n instruction does NOT exist.
• The SBRT and RET instructions are not used as a matching set.
• More than one SBRT n instruction with the same subroutine ID number, n, are used in the same program.

Instruction Behavior

The RET instruction behaves as follows:

• The subroutine program between the SBRT and RET instructions must be placed after the END instruction of the calling scan program.
• Up to 128 subroutines can be defined in one program (0 ~ 127).
• The SBRT instruction block can be nested 16 times.

Block vs. Program

This section covers information about the RET instruction, where a subroutine block is used.
For more information about using a subroutine program, refer to the subroutine program section and the ECALL or ECALLP instructions.

Examples

• Ladder Diagram