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Digital inputs serve for an indication of TRUE/FALSE logic states and can be also used as counters to collect data from pulse meters, monitor engine revolutions etc.
TRUE logic state (switched on) is indicated by the corresponding LED placed below the inputs.
Note:
For the connection of external devices to digital inputs, we recommend using a different (separate) power supply to retain galvanic isolation.
The software detects TRUE state if the input voltage between the given DIx and DIGND terminals is in range of 7-35V DC. If the voltage decreases below 3 VDC, the FALSE state is indicated. The voltage between 3-7 VDC is detected as a non-defined state.
Connection
Each digital input connector features common DIGND terminal. When using the internal power supply, the terminal is unused. If you wish to use an external power supply for DIs, you need to set switches accordingly first (see DIP switch settings. Only then it is possible to connect the power supply's negative pole to DIGND. The source's positive pole is to be connected through the external device via DIx terminal.
Connection of DI with the internal power supply:
Connecting DI with an external power supply:
Always set DIP switches first before connecting an external power supply
Connecting DI with both external and internal power supplies:
Set DIP switches before connecting the external power supply. You can connect it to any I/O group.
