SmartCheck FAQs and HowTos: Inputs and Outputs

Yes, SmartCheck supports Power over Ethernet (PoE) according to the IEEE 802.3af Mode A standard. This allows the device to receive both data and electrical power through a single Ethernet cable, simplifying installation and reducing the need for additional power sources.

No, they are standard M12 plug connectors. Only the M12 ethernet cable has a D coding.

The digital output of the SmartCheck device is an open collector. This means that it can only pull the output to ground (0V) and cannot provide a positive voltage. To connect a digital input, you will need to use a pull-up resistor, i.e. a resistor that pulls the output to a positive voltage (e.g. 5V or 24V). The value of the pull-up resistor can be between 1kΩ and 10kΩ, depending on the input impedance of the device you are connecting to.

1. PLC
2. SmartCheck
3. Signal
4. Ground

In general, there are two types of digital sensors: NPN and PNP. The main difference between the two is the way they switch the output signal. NPN sensors switch the output signal to ground (0V), while PNP sensors switch the output signal to a positive voltage (e.g. 5V or 24V).

When using a sensor with an NPN output, an external pull-up resistor is needed, which pulls the output to a positive voltage. For this, the supply voltage for the sensor can be used. When using a sensor with a PNP output, no pull-up resistor is needed, since the sensor itself switches the output to a positive voltage. The digital input of SmartCheck already has an internal pull-down resistor, which pulls the output to ground when the sensor is not active.

NPN	PNP
PLC or sensor with an NPN output SmartCheck 24V Signal Ground	PLC or sensor with an PNP output SmartCheck 24V Signal Ground

When using an NPN sensor, we advise to invert the input logic in the configuration of SmartCheck, so that a closed switch corresponds to a high signal and an open switch corresponds to a low signal. This makes it easier to understand the signal and to set up the monitoring configuration.

There are several ways to measure temperature with the SmartCheck, depending on the type of temperature sensor you want to use. The SmartCheck supports the following types of temperature sensors:

When using one of the analogue inputs of SmartCheckto measure temperature, the following steps are needed:

1. Check if the input is already in use by a measurement job, measurement trigger or measurement condition. If this is the case, you will need to change the measurement job, trigger or condition to use a different input.
2. Change the unit group to “Temperature”.
3. Set the input type and min/max values according to the temperature sensor’s output range.