Appendix 2.2 Riwt Instruction - Mitsubishi MELSEC Q Series User Manual

APPENDIX
Sequence program
RIWT instruction
Completion device
Status display device
at completion
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(c) There are two types of interlock signals for the RIWT instruction: the
completion device (D) and the status display device at completion (D) + 1.
1) Completion device
Turns ON in the END processing of the scan where the RIWT instruction
is completed, and turns OFF in the next END processing.
2) Status display device at completion
Turns ON and OFF depending on the completion status of the RIWT
instruction.
Normal completion : Stays OFF and does not change.
Abnormal completion: Turns ON in the END processing of the scan
END processing END processing
ON
OFF
OFF
OFF
(d) Multiple dedicated instructions cannot be executed for the same station.
Since it takes several scans until the processing of the dedicated instruction
is completed, execute the next dedicated instruction after the completion
device has turned ON.
The next dedicated instruction executed before completion of the previously
executed dedicated instruction is ignored.
(e) The basic number of steps of the RIWT instruction is 8 steps.
(f) The send buffer assignment is performed using the "Station information
setting" of the network parameters of the GX Developer. For more details,
see Section 6.2.
(4) Operation error
In the following cases, an operation error occurs; the error flag (SM0) turns ON
and the error code is stored in SD0.
Error code
When the module specified by Un is not an intelligent function module.
2112
When the module specified by Un is not a special function module.
4002 When an attempt was made to execute an unsupported instruction.
4003 When the number of devices in the instruction is incorrect.
4004 When the instruction specifies a device that cannot be used.
4100 When the instruction contains the data that cannot be used.
When the number of data set to be used exceeds the allowable range.
4101 Or, when the storage data or constants of the device specified with the instruction
exceeds the allowable range.
where the RIWT instruction is completed, and
turns OFF in the next END processing.
Execution completion of
the RIWT instruction
Description of operation error
MELSEC-Q
END processing END processing
ON
ON Abnormal
completion
Normal completion
1 scan
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