Chapter 15: Appendix
[3] Node status control
The status control of nodes consists of a local node management table, a participating nodes management table, and a network management table. An outline of each is shown below.
Outline of each table used for node status control
Name | Details |
Local node management table | Control its own node settings. |
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Participating nodes management table | Control information about nodes participating the network. |
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Network management table | Control information shared throughout the network. |
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[4]
(1)Basic function
Control data relating to this node. An outline is shown below.
Used for reading participating request frames and network parameters. The control data are set by the
The node name, top address and size of the data send area in the common memory can be set through the network.
(2) Control data
Individual node management table
Item | Number | Description | |
of bytes | |||
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Node number | 1 byte | 1 to 254 | |
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Area 1 of common memory: Data top address | 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 address | 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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Upper layer status | 2 bytes | RUN/STOP/ALARM/WARNING/NORMAL | |
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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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Vendor name | 10 bytes | Vender name | |
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Manufacturer name | 10 bytes | Manufacture model name, device name | |
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Node name (facility name) | 10 bytes | Node name by user entry | |
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Protocol version | 1 byte | Fixed to 0x80 | |
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FA link status | 1 byte | Participate/leave | |
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Local node's status | 1 byte | Doubled node number detection, etc. | |
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