Connection between our HMI and Schneider/Modicon Unitelway RS485 PLC

 

This device driver is used to read and write the data or state of Unitelway network device register from Schneider/Modicon PLC
It establishes serial communication connection with the programming port of Unitelway network device through the HMI RS485 serial por

Select the right type device in HMI-Tool

Try the TWIDO Series protocol first, if there is a problem, then check the NEZA Series protocol.

Communication parameters

• Baud rate: 9600
• Data bit length: 8
• Stop bit length: 1
• Parity check bit: Odd

The operation of the TER (and AUX) socket depends on two parameters

• the software configuration of channel 0 defined under PL7 Micro/Junior/Pro
• the signal status of the DPT pin of the TER connector

Therefore, for communication in Unitelway protocol:

• Select Unitelway in the PL7 configuration of channel 0
• NOT connect the DPT pin (pin 5) of the TER socket to 0V (pin 7) : Only use for Modbus software configuration

HMI COM1 or COM2			PLC MD8M
8	TX –	<>	2	TX –
9	TX +	<>	1	TX +
5	GND	<>	7	GND

The distance HMI<>PLC must be less than 500 m

Operational address range

0 to 1023 for %MW : MWdddd where dddd indicates decimal