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Which Zennio devices include binary inputs?
You can check which Zennio devices have binary (digital) inputs in the following table
Differences between Push button and Switch/Sensor inputs
A push button connected to an input consists of a device, which allows, or not, the current flow while this is being pushed; in normal conditions, push buttons contacts are always open (NO) or closed (NC). This event is a pulsation and the time it lasts, threshold time. Depending on the “Threshold Time” it can be distinguished two different actions:
- Short press
- Long press
A Switch/Sensor connected to an input, consists of an electrical mechanism which may have its contacts open or closed under normal conditions. These mechanisms don’t recover their normal position automatically as with the push button. A transition of a digital signal from low/high/low is called "Edge".
- Falling edge: Closed contact to Open Contact.
- Rising edge: Open contact to Closed Contact.
What type of contacts can be connected on the binary inputs?
Binary inputs of Zennio devices are voltage free contacts. They can be individually configured and each of them can be connected to a push buttons and/or a switch/sensors.
Can I connect several push buttons in parallel in the same input?
Yes, inputs are voltage free, so there is no problem in connecting several push buttons in parallel.
Why do I have to press twice over an input for the output to react?
It happens when one output is commuted by two or more different inputs and the output status object isn't used to synchronize these inputs.
What is the maximum length allowed for the wiring of the digital inputs?
The wiring of the digital inputs can be extended up to 30 meters using a cable with a section between 0.15 mm2 and 1 mm2.
What does safe mode mean?
When a device is running in safe mode the programming LED blinks in red, meaning that the application program is halted.
How to set a device in safe mode?
To activate the safe mode, keep the programming button pressed while connecting the device into the KNX bus. This process is described in the datasheet of the device.
How to exit from safe mode?
To exit from safe mode, simply plug the KNX bus into the device but do not press the programming button this time. This way the programming LED does not blink, meaning that the application program is running (safe mode is not active).
How do a download in safe mode?
When an incidence is caused during the download, it is recommended to do a safe mode download, to ensure that the previous corrupted download doesn’t affect to this new download:
To do a download in safe mode, you should follow the next steps:
- Disconnect the device from KNX bus.
- Connect the device to KNX bus while holding down the programming button. The programming LED will start blinking indicating that the device is in safe mode.
- Once in safe mode, download the application program completely to the device.
- When the download is finished, disconnect and reconnect the device from the bus.
