Call Subroutine (Program)

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
PID	-	-	-	-	-	-	-	-	-	-	-	-	-	-	✓
n	-	-	-	-	-	-	-	-	-	-	-	-	-	-	✓

Supported Flags

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

Number of Steps

Steps
2

Operands

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

Notice

Notice

Errors will occur when the following conditions are met:

• The END instruction is located between the SBRT and RET instructions.
• The nesting of the ECALL or ECALLP occurs more than 16 times.
• The JMP/JMPP ~ JMP/JMPP block is located between the SBRT ~ RET block.

Instruction Behavior

The ECALL and ECALLP instructions behave as follows:

• The ECALL or ECALLP instructions in a scan program calls the subroutine program of SBRT ~ RET block inside an external program.
  • The external program may be a scan or subroutine program.
• When the execution condition is ON (1), the ECALL or ECALLP instruction calls the subroutine program, PID, with the assigned subroutine ID number, n.
• When the subroutine is completed, the program continues execution after the ECALL or ECALLP instructions.
• The ECALL and ECALLP instructions can be nested up to 16 times.
• The ECALL and ECALLP instructions can be used multiple times in the same program.
• When SBRT is duplicated in the external program file, a compile error occurs.

Block vs. Program

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

Examples

• Ladder Diagram