9 DEDICATED INSTRUCTIONS
9.2 ONDEMAND Instruction
The ONDEAMAND instruction transmission data using the
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| Applicable device |
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Set | Internal device |
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| MELSECNET/H, |
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| MELSECNET/10 | Special module |
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data | (System, user) |
| File register |
| Index register Zn | Constant | Others | |||||||||||||||||||||||
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| Direct J | \ |
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| U | \G |
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| Bit |
| Word |
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| Bit |
| Word |
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(S1) | — |
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| — |
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(S2) | — |
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| — |
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(D) |
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| — |
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| [Instruction |
| [Executing |
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| code] |
| condition] |
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| Command |
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| ONDEMAND |
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| G.ONDEMAND | Un |
| (S1) | (S2) |
| (D) |
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| ONDEMAND |
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| Command |
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| GP.ONDEMAND |
| Un |
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| (S1) |
| (S2) |
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| (D) |
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Set data
Set data | Description | Set by | Data type | |
Un | Start I/O signal of the module | User | BIN16 bit | |
(00 to FE: Top | ||||
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(S1) | Head number of the devices in which control data is stored. | User, |
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system | Device name | |||
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(S2) | Head number of the devices in which transmission data is stored. | User |
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(D) | Bit device number to be turned on at completion of execution. | System | Bit |
The file register per local device and program cannot be used as the set data.
Control data
Device | Item | Set data | Setting range | Set by | 3 |
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| • | Set transmission channel |
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(S1) + 0 | Transmission channel | 1: Channel 1 (CH1 side) | 1, 2 | User |
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2:Channel 2 (CH2 side)
•Result read by an ONDEMAND instruction is stored.
9 |
| (S1) + 1 | Transmission result | 0: | Normal | 1 |
| — | System |
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| Other than 0: Error code |
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| (S1) + 2 | Transmission data count | • Set the transmission data count. | 2 | 1 or more | User | ||
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1 For error codes relating to abnormal completion, see Chapter 10 of the User's Manual (Basic).
2 When setting "Word/byte units designation" by GX
3 The settings are done by either of the following:
•User: Data set by the user before executing the ONDEMAND instructions.
•System: The PLC CPU stores the execution result of the ONDEMAND instructions.
9 - 2 | 9 - 2 |