9 DEDICATED INSTRUCTIONS
1 When setting "Word/byte units designation" by GX
2 The settings are done by either of the following:
•User: Data set by the user before executing the BIDIN instructions.
•System: The PLC CPU stores the execution result of the BIDIN instructions.
Function
(1)The function stores in the device designated in (D1) and succeeding devices the data received via the bidirectional protocol of the module designated in Un, according to the control data of the device designated in (S) and succeeding devices.
(2)When a BIDIN instruction is executed on a channel, other BIDIN instructions cannot be executed on the channel at the same time.
If an attempt is made during execution of a BIDIN instruction to execute another BIDIN instruction, the second instruction will not be executed until the execution of the first instruction is completed.
(3)It cannot be used along with BUFRCVS instruction (for interrupt programs).
(4)Whether a BIDIN instruction was completed normally can be checked by the completion device ((D2)) or status display device at completion ((D2)+1).
(a)Completion device: Turns on at the END processing of the scan where the BIDIN instruction is completed normally, and turns off at the next END processing.
(b)Status display device at completion: Does not change when left off.
[Operation during execution of a BIDIN instruction] |
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Sequence | END |
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processing |
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| Execution of BIDIN instruction |
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| BIDIN instruction | |||
BIDIN |
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instruction |
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| ON |
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Completion device |
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Status display device | OFF |
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at completion |
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One scan
9 - 15 | 9 - 15 |