Home » DC 12V 24V 32-channel DIN Rail PNP NPN Isolated Digital Input Controller Module RS485 Modbus Rtu Controller PLC Expansion Board DC 12V 24V 32-channel DIN Rail PNP NPN Isolated Digital Input Controller Module RS485 Modbus Rtu Controller PLC Expansion Board DC 12V 24V 32-channel DIN Rail PNP NPN Isolated Digital Input Controller Module RS485 Modbus Rtu Controller PLC Expansion Board. Sale price : $18.84 Category : Tools