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240 Operators Manual

Model 240 Operator Manual Rev. 1.8 Page 18 of 29

7. System Features

7.1 Modbus Communications

The model 240 controller features a Modbus compatible communications protocol and is addressable by a

PLC, PC/HMI, DCS, or other Modbus RTU master polling device. Communications is accomplished by

two wire half duplex RS-485, 9600 baud, 8 data bits, 1 stop bit, no parity, through the controllers secondary

port. Wiring should be brought directly to J10 located on the motherboard.

A Modbus™ RTU master device up to 4000 feet away can theoretically poll up to 64 different controllers.

This number may not be realistic in harsh environments where noise and/or wiring conditions would make

it impractical to place so many devices on the same pair of wires. If a multi-point system is being utilized,

each controller must be set to a different device address.

Modbus™ Register Detail:

Code 03 - Read Holding Registers is the only code supported by the 240 controller.

40000 Channel 1 Reading

40001 Channel 2 Reading

40002 Fault Status Bits

High Byte

Bit 7 Not Used

Bit 6 Not Used

Bit 5 Not Used

Bit 4 Not Used

Bit 3 Not Used

Bit 2 Not Used

Bit 1 Not Used

Bit 0 Not Used

Low Byte

Bit 7 Not Used

Bit 6 Not Used

Bit 5 Not Used

Bit 4 Not Used

Bit 3 Not Used

Bit 2 Not Used

Bit 1 1 = Channel 2 Fault 0 = Channel 2 no Fault

Bit 0 1 = Channel 1 Fault 0 = Channel 1 no Fault

40003 Alarm 1 Status Bits

High Byte

Bit 7 Not Used

Bit 6 Not Used

Bit 5 Not Used

Bit 4 Not Used

Bit 3 Not Used

Bit 2 Not Used

Bit 1 Not Used

Bit 0 Not Used

Low Byte

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 32 33

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