Chapter 7: Computer Link Function
(2)Participating node management table
The participating node management table contains data related to the nodes currently participating in the network.
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| Item | Number | Description |
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| Node number | 1 byte | 1 to 254 |
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| Upper layer status | 2 bytes | RUN/STOP/ALARM/WARNING/NORMAL |
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| Area 1 of common memory: Data top | 2 bytes | Word address (0 to 0x1ff) |
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| Area 1 of common memory: Data size | 2 bytes | Size (0 to 0x1ff) |
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| Area 2 of common memory: Data top | 2 bytes | Word address (0 to 0x1fff) |
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| Area 2 of common memory: Data size | 2 bytes | Size (0 to 0x1fff) |
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| Allowable refresh cycle time | 2 bytes | In units of 1 msec. |
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| Token monitor time | 1 byte | In units of 1 msec. |
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| Minimum separation of frames | 1 byte | In units of 100 µsec. |
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| Link status | 1 byte | Participate/leave | |
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-"0x1ff" is the hexadecimal notation for 1FF(HEX).
-For details about the participation node management table maintained by the
(3)Network management table
The network management table contains information common to the network.
Network management table
Item | Number | Description | |
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Token latch node number | 1 byte | Currently token staying node. | |
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Minimum separation of frames | 1 byte | In units of 100 µsec. | |
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Allowable refresh cycle time | 2 bytes | In units of 1 msec. | |
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Measured refresh cycle time (current value) | 2 bytes | In units of 1 msec. | |
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Measured refresh cycle time (maximum value) | 2 bytes | In units of 1 msec. | |
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Measured refresh cycle time (minimum value) | 2 bytes | In units of 1 msec. | |
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- For details about the network management table maintained by the