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8-32 DI-DO PNP to PNP RS485 Modbus Rtu Remote IO Module DC 12-24V 300MA Output

16-48 DI NPN/PNP Digital Switch PLC IO Expansion Board DC Optical isolation Inpu

24CH RS485 Remote Control Switch Multifunction PLC IO Expansion Board Modbus

3 IN 1 Serial Serve/Ethernet/RS485 Relay Module Modbus Network Controller Switch

1 PCS 8 Channel 12V 24V Relay Shield Module RS485 PLC IO Expanding Board

Industrial Grade 4DO RS485 Relay Module DIP Switch Set Parameters Modbus RTU

1 PCS 8 Channel 12V 24V Relay Shield Module RS485 PLC IO Expanding Board