Replace the PLC with io-key

Use the io-key edge switching functions to switch up to two digital outputs in real time directly at the device, independently of the cloud. For this purpose, a configuration is stored directly on your device.

Regardless of the selected transmission interval, the edge switching function runs autonomously on io-key and permanently monitors the process or application. io-key thus replaces a PLC and enables direct addressing of actuators (e.g. stack lights or acoustic signals). Wiring is possible using a simple Y-cable and is easy to perform.

In the respective cloud account, it is possible to set the condition under which a switching output is changed directly on io-key, regardless of the applied transmission interval. To do so, set the rule (e.g. limit value greater than X, limit value less than X) before selecting the switching output that is to be changed on io-key as soon as the limit value has been reached. Furthermore, a hysteresis as well as a switch-on/ switch-off delay can be set. As soon as the set limit value has been reached or exceeded, the output function at the set output changes.


Schematic representation of the switching function and configurable parameters:

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Overview of the io-key edge switching function:

1) Basics
The name of the rule can be assigned individually.

2) Condition
The switching rule and the switch point are set.

3) Hysteresis
The hysteresis refers to the difference between the switch point and the switch-back point.

4) Output signal
The output port and its output function are selected.

5) Switching delay
The switching signal can be delayed with this function.

Edge switching function

Application example: Alarm for leakage

Remote tank system monitoring with io-key

io-key collects and transmits sensor data for further processing in an individual cloud and software environment. A new feature is that it can also execute alarms and switching operations directly at the machine independently and in real time. This makes it possible to create complete end-to-end applications for IIoT without a complex and expensive infrastructure – the use of a PLC is no longer necessary.

Edge valve control at a critical filling level

If the tank reaches a critical filling level, the level sensor registers this and an alarm is immediately triggered at io-key, which is indicated by the message "Tank system: Critical filling level reached. Valve opened" in the

At the same time, a switching output is activated at the edge, which opens the electric valve to initiate the discharge of water and activates the red status indicator. When the tank is almost empty, the valve is closed by io-key and the green LED lights up again. The flow sensor reports the flow rate in the cloud and notifies the production management about this process.

The io-key edge switching and alarm function is conveniently controlled from an office without the need for any programming. All the necessary parameters are defined via a graphical interface in the from anywhere in the world, stored locally at the edge and executed independently of the wireless connection.


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