Description: The KTB-224 is a Modbus Slave IO module for interfacing to any PLC or PC using the Modbus protocol. It behaves as a Modbus Slave and Relays, Inputs and Outputs are controlled by writing to and reading from the Coils and Holding Registers. It can be used for many applications such as controlling lights and sprinkler systems, reading sensors and monitoring switches and other digital signals, or even for industrial control. The module can connect to a standard RS485 2-wire half duplex network or to a computer via USB. When connected via USB, the module acts as a USB to RS485 converter and multiple IO units (or other Modbus devices) can be connected to the RS485 bus. USB drivers are available for Windows, Mac and Linux. The user can save a set of output statuses to be loaded when the unit is powered up or reset. A watchdog timer can be configured to reset the unit after a user-definable number of seconds since the last communication from a Modbus master.
Features 8 Relay outputs (5A, 250VAC contacts) 4 Opto-Isolated Inputs with counters 3 Analog Inputs (10 bit) jumper-selectable for 0-5V or 0-20mA 4 Input Counters RS485 or USB (virtual serial port) Can be used as a USB to RS485 converter Watchdog Timer resets the unit when communication from the network master is lost Connections via Pluggable Screw Terminals 1200-38400 Baud Modbus Slave Device Specifications Power Supply Vs and COM: KTA-224: 9-16V DC (12V Nominal) ~200mA + External 5V drain KTB-224: 18-32V DC (24V Nominal) ~200mA + External 5V drain Analog Input ANx: 0-5V: ~500kÎ© effective resistance with no jumper installed 0-20mA: ~250Î© effective resistance with jumper installed Opto-Isolated Input: 0-30V, ~1kÎ© effective resistance Relay Outputs: SPDT relays rated to 5A (resistive). 250VAC / 30VDC 5V Auxiliary Supply 5V: 200mA