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194 Message Routing

890 USE 100 00

B .3 Controller Bridge Mode Routing

If a Modbus message is received at the Modbus port of a controller that

is set to bridge mode, the address (in the range 1 ... 255) is converted as

shown in Figure 75.

RESERVED

255

DIRECT

ATTACH

ADDRESS

EXPLICIT

ATTACH

ADDRESS

IMPLICIT

ATTACH

ADDRESS

Figure 75 Controller Bridge Mode Address Conversion

1 ... 64

If the address is in the range 1 ... 64 (Direct Attach Address), the

message is routed to the specific node address 1 ... 64 on the local

Modbus Plus network.

70 ... 79

If the address is in the range 70 ... 79 (Explicit Attach Address), it

causes the controller to access an address map table stored in a set of

holding (4x) registers. These registers are located immediately

following the Free-Running Timer Register in user logic (you must

therefore implement the Timer in your logic program). Modbus

addresses in this range thus become pointers to the routing table,

which contains ten stored routing paths for Modbus Plus.

1 2 ... 202 203 204 205 206 207 208 209 210 211 212 ... 260 261

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Schneider Electric Modbus Plus Network Bridge Multiplexer none Guia de Instalação Página 207