Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 217)

6 Application Instructions API 00-49
DVP-PLC Application Manual 6-5
API Mnemonic Operands Function
01 CALL P Call Subroutine
Controllers
ES/EX/SS SA/SX/SC EH/SV
OP Range Program Steps
P0 ~ P255 CALL, CALLP: 3 steps
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Operands:
S : The pointer of call subroutine.
Explanations:
1. Operand S can designate P.
2. P can be modified by index register E, F.
3. In ES/EX/SS series models: Operand S can designate P0 ~ P63.
4. In SA/SX/SC/EH/EH2/SV series models: Operand S can designate P0 ~ P255.
5. Edit the subroutine designated by the pointer after FEND instruction.
6. The number of pointer P, when used by CALL, cannot be the same as the number designated by CJ instruction.
7. If only CALL instruction is in use, it can call subroutines of the same pointer number with no limit on times.
8. Subroutine can be nested for 5 levels including the initial CALL instruction. (If entering the sixth level, the
subroutine won’t be executed.)
API Mnemonic Function
02 SRET Subroutine Return
Controllers
ES/EX/SS SA/SX/SC EH/SV
OP Descriptions Program Steps
N/A
Automatically returns to the step immediately following the
CALL instruction which activated the subroutine
SRET: 1 steps
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Explanations:
1. No operand. No contact to drive the instruction is required.
2. The subroutine will return to main program by SRET after the termination of subroutine and execute the
sequence program located at the next step to the CALL instruction.
Program Example 1:
When X0 = On, CALL instruction is executed and the program jumps to the subroutine designated by P2. When
SRET instruction is executed, the program returns to address 24 and continues its execution.