Mitsubishi Electric MELSEC-Q/L Programming Manual page 486

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• The device used for the argument of the XCALL instruction must not be used in a subroutine program. If used, it will not be

possible to perform correct calculations. (Page 484 Incorrect operation example)

■Incorrect operation example

The following example shows the operation performed when D0 is specified for FD0 in the subroutine program and D1 is used

in the subroutine program.

[Program example]

[Operation performed after subroutine program execution]

Before the execution

of subroutine program

*1 Stores the execution result of the subroutine program.

*2 Replaced by the value of the function device.

*3 D1 does not reflect the operation result in the subroutine program.

7 APPLICATION INSTRUCTIONS

7.6 Structure Creation Instructions

Immediately after the execution

of XCALL instruction

At the time of subroutine

program execution

After the execution

of RET instruction