Detcon 240 Manual de instrucciones descargar pdf (Pagina 22)

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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Detcon 240 Manual de instrucciones Pagina 22

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