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DVP-ES2/SA2/SS2/SA2/SX2/SE Operation Manual - Programming
3-52
API Mnemonic Function
06
FEND The End of The Main Program (First End)
Controllers
ES2/EX2 SS2
SA2
SE
SX2
OP Descriptions Program Steps
N/A No contact to drive the instruction is required. FEND: 1 step
PULSE 16-bit 32-bit
ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2
Explanations:
1. Use FEND instruction when the program uses either CALL instructions or interrupts. If no
CALL instruction or interrupts are used, use END instruction to end the main program.
2. The instruction functions same as END instruction in PLC operation process.
3. CALL subroutines must be placed after the FEND instruction. Each CALL subroutine must
end with the SRET instruction.
4. Interrupt subroutines must be placed after the FEND instruction. Each interrupt subroutine
must end with the IRET instruction.
5. When using the FEND instruction, an END instruction is still required, but should be placed
as the last instruction after the main program and all subroutines.
6. If several FEND instructions are in use, place the subroutine and interruption service
programs between the final FEND and END instruction.
7. When CALL instruction is executed, executing FEND before SRET will result in errors.
8. When FOR instruction is executed, executing FEND before NEXT will result in errors.