3.4.8Modbus Address Map
The B85 maintains four internal odbus Address ap tables for routing the odbus messages received at its four odbus ports. Each port has a table that can hold up to 64 entries that you specify during configuration.
Vthe location in the table at which you want to place the entry
Va
Va
Each table entry specifies how you will want a odbus address received at the odbus port to be converted into a
When a odbus message is originated from a device at one of its odbus ports, the B85 searches the odbus Address ap table for that port to find a match between the message's odbus address and a odbus address stored in the table. The actions taken if a match is found, or if a match is not found, are described below and on the following pages.
If a Match is Found
If a match is found, the five bytes of mapped routing from the table entry will be applied to the message, and it will be sent out using that routing. Here are five examples of how the odbus Address ap table can be used to develop routing paths for odbus messages:
Table Location | Modbus Address | Five±Byte Routing Path | |||||
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01 | 47 | 8 | 0 | 0 | 0 | 0 |
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02 | 182 | 20 |
| 14 | 0 | 0 | 0 |
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03 | 27 | 20 |
| 22 | 5 | 0 | 0 |
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04 | 33 | 0 | 3 | 0 | 0 | 0 |
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05 | 125 | 0 | 4 | 99 |
| 0 | 0 |
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VEntry 01 is an example of routing to node 8 on the local odbus Plus network. If the odbus message contains the destination address 47, a match is found in the table. The B85 will apply the routing path 8, 0, 0, 0, 0 to the message. The message is acted upon by the application program in the device at node address 8.
36 Configuring the Modbus Models | 31007492 |
