Mini PLC

Mini PLC

SKU: KTA-323

Arduino-compatible controller with eight relay outputs, four opto-isolated inputs and three 4 to 20 mA or 0 to 5 VDC analog inputs. Interfaces using USB, RS-485 serial or Ethernet. Windows, Mac OS X and Linux compatible. DIN rail mountable.

Ocean Controls
  • Manufacturer: Ocean Controls
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The KTA-323 is a USB, RS-485, or Ethernet controlled IO module for interfacing PC's to real world applications, such as controlling lights and sprinkler systems, reading sensors and monitoring switches and other digital signals. It's also an Arduino compatible controller and can be programmed with Arduino IDE for stand-alone operation.

The relays are capable of switching up to 5A at 250 VAC. Bi-directional, optically-isolated digital inputs can be wired to NPN, PNP or dry contact (switch) type sensors. Three analog inputs can be used for 0 to 5 VDC or 0 to 20 mA (including industry standard 4 to 20 mA) signals.

A simple ASCII protocol allows control from Windows/Mac/Linux using either USB Virtual serial port drivers or RS-485. Additionally, multiple devices can be connected to one RS-485 bus, allowing control of many devices from one USB port.

Multiple controllers can be connected to one or more PCs in an RS-485 network. Each controller can be assigned an address and will respond to commands addressed to them.

The KTA-323 can also be controlled over the internet. A webpage is served out over the Ethernet port, allowing monitoring of all I/O, as well as manipulating the relays.

 December 2013, We now have a mobile version for this website (see pictures), please go to the manual for more details.

The controller is based on the hardware of the Arduino physical computing controllers. It can be programmed as a stand-alone controller using the free, open source Arduino environment. The Ethernet mimics the hardware of the Arduino Ethernet shield, and is fully compatible with the Ethernet Library. Additionally, the unit ships with a globally unique MAC address.

An example program has been written in Visual Basic to show you how to interface with the KTA-323 using a PC.

  • Power Supply: 8 to 32VDC
  • Power Consumption: ~3.1W + external 5V drain
  • Current Consumption: 520mA
  • 3 x Analog Inputs: 10 bits, jumper selectable for 0 to 5 VDC or 0 to 20 mA
  • 4 x Digital Inputs: opto-isolatied, bi-directional, 0 to 30V
  • 8 x Relay Outputs: SPST relays rated 5A, 250 VAC / 30VDC
  • 1 x 5V Auxiliary Supply: 300mA
  • Protocol: ASCII over USB virtual serial driver or RS-485. Also communicates via Ethernet.
  • Easily connect multiple units far apart by RS-485
  • Monitor and control I/O remotely on the internet
  • Power Indicator, relay status, TX and RX LEDs (Serial and Ethernet).
  • Accepts XBee form factor expansion modules
  • Arduino compatible
  • Connections via screw terminals
  • All enclosed in professional looking plastic case
  • DIN rail mountable
  • Operating Temperature: 0 to 70°C
  • Dimensions: 145L x 90W x 40H (mm)
    • SKU
    • Weight
      0.25 kg
    • Dimensions (L x W x H)
      15 x 10 x 5 cm



Faulty Goods and Warranty

Where such goods have been supplied we undertake to repair or replace them as quickly as possible.Prior to returning faulty items, please contact us with a description of the fault as one of our engineers might be able to assist you by resolving the issue over the phone.
A Warranty form must be filled out and returned with any goods.

Our standard warranty period is 12 months from the date of purchase unless stated otherwise.

Other warranty periods:

Labjack Products: 5 Years
Atop Products: 3 Years
MeanWell Products: 3 Years
Terracom Products: 3 Years

Warranty is subject to us being satisfied that a defect was caused by defective workmanship or materials and was not caused by or was not substantially contributed to by other factors beyond our control including incorrect installation, alterations or modifications of the product not recommended by the manufacturer.

Returns Policy

If you are dissatisfied with our goods you may return them within 14 days of the dispatch date. Contact us for an authorisation and we will refund your purchase less shipping costs and restocking fees. All returned goods MUST be in AS NEW condition including ALL PACKAGING and DOCUMENTATION / MANUALS etc.

Please note:

  • The product returned will attract a 20% restocking fee.
  • The customer must pay the delivery costs.
  • Non standard, custom made or a specially manufactured or imported products are not returnable.
  • Semiconductors, books and software are not refundable

Full Terms and Conditions

By placing an order with Ocean Controls, you agree to be bound by our Terms and Conditions of Trade.

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