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FixSus develops field equipment for building automatisation using as base the Beckhoff PLC technology.
Simplicity, affordability and ease of use all lay at the base of our products. All our products communicate with the PLC through the DIOC protocol. More about this subject at ‘More about the DIOC protocol

More simplicity for the installer, more comfort for the client

It cannot be easier: the communication goes through the standard Input/Output terminals

Our devices are trendsetters in the world of open building automation.

Main Advantages:

  • Simple hardware: The bidirectional communication happens by sending fast pulsation messages through a standard PLC input and output.
  • Standard cabling: The DIOC protocol requires only a cable with 3 arteries, without shielding. At FixSus we use SVV 3×0.8 or the halogen-free alternative SGG 3×0.8 (parlophone cable). We use this to support distances up to 200 meters.
  • No external power necessary: Our devices are so economical that the power is delivered through the digital exit of the PLC controller. An independent power cable is never required.
  • No addresses, no numbering: A DIOC device contains no software, nor any address that changes for every project. To replace a device? Just take a new device out of its box or a device from the next room and click it in… and that’s it!
  • The logic is situated in the central PLC controller: In the device, there are only sensors and a simple communication chip. All logic is located in the PLC controller, and can also be controlled centrally. If the functionality has to be adapted for all devices, we just make one adjustment in the PLC controller.

More about the DIOC protocol

Curious about how the DIOC works? We give you with pleasure a brief overview.

DIOC (Digital Input and Output Communication) is a point to point communication between the TP10/RA and a digital input and a digital output of the PLC. All communication works on the base of a digital pulse train of 20 bits, composed of 1 start bit, 7 address bits and 12 value bits.

There are three communication principles:

Polling, on initiative at the PLC

The PLC asks the device to read a sensor value, the device answers with the sensor value 22,03 °C. Each device contains multiple sensors that we can read individually per register.

OnChange, on initiative from the device

The TP10 sends on its own initiative a message to the PLC-controller when a button is being touched. By this, the TP10 notifies that the button is being used. Upon release of the button, the TP10 sends another message to notify that the button is no longer in use.

AutoRepeat where the TP10 sends data periodically

The PLC-controller can impose a device to for example send a sensor value every 5 seconds, like for example the relative humidity. Of course you can choose the interval freely.