Chapter 9: Description for Data Link Operation
The data link function is used to send and receive ON/OFF signals (relay link) and data (register link) between modules by assigning one module from PCs or FA devices as the master station and other units as slave stations in the satellite net system. Up to 64 sets of PCs and FA devices can be connected in the satellite net.
Each station sends data in its sending area cyclically and stores data received from other stations in its receiving area. For the
When the
- Master station |
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| Data link (Standard function) Receiving data of all of the relay link area and | |||
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| all of the register link area of all the stations. | ||
- Slave station |
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| Data link (Standard function) } |
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| Data link (Save memory function) |
| In order to effectively use the |
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| memory, unify a partial data area or |
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| sending/receiving address (program) |
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| of slave stations. |
For the standard function and the save memory function of the |
9-1 Communication method
[1] Data link (Standard function)
Each station cyclically sends and receives ON/OFF signals and data of the relay link area and register |
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link area set to a master station parameter. |
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(1) Relay link | ||
Mainly used for sending and receiving ON/OFF information |
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[Example] In the case of sending |
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Master station (PC00) | Slave station (PC01) | Slave station (PC02) |
コ0200 コ0201 コ0202
PC00 Program | PC01 Program | PC02 Program |
| 02000 | 02000 |
| 02000 |
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02010 |
| 02010 |
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| 02010 |
02020 | 02020 |
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02020
:Send :Receive
- The link relay of the receiving station must be programmed as input signal by the PC program- ming. Also, it may be used as source (S) side of application instruction.
- The sending and receiving data correspond in bits of one point unit.
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| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | ||
コ0200 |
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| コ0200 |
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| Is the same value as コ0200 of the master station. | ||||||||||
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | ||
コ0201 |
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| コ0201 |
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Is the same value as コ0201 of the slave station.