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8 Relay 8 Analog Modbus IO Module (12V)

8 Relay 8 Analog Modbus IO Module (12V)

The KTA-226 is a Modbus Slave IO module for interfacing to any PLC or PC using the Modbus RTU 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 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.

8 SPDT (changeover) relays can be operated as coils or with a pulse timer. The pulse timer switches the coil on for a specified number of milliseconds before automatically resetting it.

The 8 analog inputs are jumper-selectable for 0-5V or 0-20mA (including 4-20mA) input. 10 bit precision is presented on all channels.

The user can save a set of relay and timer 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.

12V (KTA-226) and 24V (KTB-226) versions are available.


  • 8 Relay Outputs 5A 250VAC
  • 8 Analog Inputs (10 bit) 0-5V or 0-20mA Analog Inputs, Jumper Selectable
  • Connections via Pluggable Screw Terminals
  • USB Virtual Serial Port or RS485 Input
  • Acts as a USB to RS485 converter
  • Easily connect multiple units far apart by RS485

All configuration parameters are available via Modbus. A small utility has been written which allows testing and configuration of serial parameters


Download Manual

Test and Configuration Utility


SKU:  KTA-226

Out of stock - backorder allowed

Out of stock - backorder allowed

Qty. Price
(AUD ex. GST)
1 to 4 $219.00
5 to 9 $197.10 (10% off)
10+ $186.15 (15% off)