Mitsubishi Melsec-L Series User Manual page 162

(3) Functions
• This instruction performs the open process for a connection specified by (S1) for the module specified by Un.
The setting value used for the open process is selected by (S2)+0.
• Completion of the OPEN instruction can be checked with Completion device (D1)+0 and (D1)+1.
Item
Completion device
(D1)+0:
Completion device
(D1)+1:
[Operation while the OPEN instruction is being executed]
Program
OPEN instruction
Completion device
Completion device + 1
• The ZP.OPEN instruction is executed on the rising edge (OFF ON) of the open command.
Do not perform an open or close process using I/O signals and the dedicated instruction together for the same connection.
Doing so will result in malfunction.
(4) Errors
If a dedicated instruction ends with an error, Completion device (D1)+1 turns on, and the error code is stored in
Completion status (S2)+1.
160
Turns on at the END process of the scan where the OPEN instruction is completed and turns
off at the next END process.
Turns on and off depending on the completion status of the OPEN instruction.
Normal completion: Stays off and does not change.
Abnormal end: Turns on at the END process of the scan where the OPEN instruction is
completed and turns off at the next END process.
END
Scan Scan
process
Executed
Connection
opened
Description
END END
Scan
process process
Abnormally ended