ModbusTCP Configuration
The XEM CPU has Modbus TCP capability with the built in Ethernet port.
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Modbus TCP uses port number 502.
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The XEM CPU can be a Modbus server and client.
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There are a maximum of 16 Channels to be shared by Modbus TCP Server and Client.
| Type | Capability |
|---|---|
| Modbus TCP Server |
Up to 16 channels available. Up to 512 bytes of data. This is a dedicated function. |
| Modbus TCP Client |
Up to 15 channels available. Up to 512 bytes of data. This is a P2P function. |
Available Memory Locations for Modbus
| Area | Device Type | Size (Word) | Remark |
|---|---|---|---|
| I | %IW0.0.0 - %IW15.15.3 | 1024 | Read, Write Enable |
| Q | %QW0.0.0 - %QW15.15.3 | 1024 | Read, Write Enable |
| M | %MW0 - %MW16383 | 16384 | Read, Write Enable |
| W | %WW0 - %WW32767 | 32768 | Read, Write Enable |
Available Function Codes
| Function Code | Function | Modbus Transcription |
|---|---|---|
| Function Code 01 (h01) | Reading output bit | Read Coils |
| Function Code 02 (h02) | Reading input bit | Read Discrete Inputs |
| Function Code 03 (h03) | Reading output word | Read Holding Registers |
| Function Code 04 (h04) | Reading input word | Write Input Register |
| Function Code 05 (h05) | Writing output bit | Write single Coil |
| Function Code 06 (h06) | Writing output word | Write single Register |
| Function Code 15 (h0F) | Writing output bit sequentially | Write Multiple Coils |
| Function Code 16 (h10) | Writing output word sequentilly | Write Multiple Registers |
LP201