Return From Subroutine Programs - Mitsubishi Electric MELSEC-Q/L Programming Manual

Return from subroutine programs

RET
High
Basic
Process
Redundant Universal
performance
RET
Setting Internal device
data
Bit Word
 
Processing details
• Indicates end of subroutine program
• When the RET instruction is executed, returns to the step following the CALL (P), FCALL (P), ECALL (P), EFCALL (P) or
XCALL instruction which called the subroutine program.
Main routine
program
CALL Pn
END
Operation error
• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.
Error Error details
code
4211 After the CALL(P), FCALL (P), ECALL (P), EFCALL (P) or XCALL instruction
was executed, an END, FEND, GOEND, or STOP instruction was executed
prior to the RET instruction.
4212 The RET instruction was executed prior to the CALL (P), FCALL (P), ECALL
(P), EFCALL (P) or XCALL instruction.
LCPU
R, ZR J\
Bit
Subroutine
program
Pn
RET
U\G Zn
Word
Q00J/ QnH QnPH
Q00/
Q01
  
  
7 APPLICATION INSTRUCTIONS
7.6 Structure Creation Instructions
RET
Constant Others
QnPRH QnU LCPU
  
  
467
7