8.5 Modbus/TCP
The Modbus/TCP protocol provides device control using register and coil banks defined by the slave device. This section defines the iVu
Plus Modbus/TCP register and coil banks. From the point of view of the slave device (PLC), there is one output coil registers and two
Input Coil registers. The bits in the Output Coil Registers cause actions to occur. The corresponding ACK bits in the Input Coil register get
set when the action is complete. The Status Coil register provides status of certain system states. By specification, Modbus/TCP uses
TCP port 502.
Note that the output coils correspond to the Output and ACK Flags, and the input coils correspond to the Input Flags.
Modbus Function Codes Supported:
01: Read Coil Status
02: Read Input Status
03: Read Holding Registers
04: Read Input Registers
05: Force Single Coil
06: Preset Single Register
07: Read Exception Status
15: Write Multiple Coils
16: Preset Multiple Registers
iVu Plus User's Manual
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