FI002K0018v1100UK – THS/21 Instruction manual for installation, use and maintenance
3
INSTALLATION
ORIGINAL INSTRUCTIONS 97
3.7.3 Connection of push-buttons or sensors
Connect each device to the power supply card input corresponding to the function it has to perform.
The power supply voltage of the Vin inputs is protected by an auto-resetting fuse which can be activated if the device is
connected wrongly.
The input devices may be simple contacts (relays or buttons) or sensors with a transistor output
(with saturation voltage less than 1 V, of the push-pull type, PNP or NPN, with 24 V output).
The input logic (positive or negative, depending on whether they are active at the high level +Vin or
the low level 0 V, respectively) can be selected in programming ( Input logic parameter, see the
Programming Manual) and is valid for all
the inputs: as a result, the outputs of all the sensors and
the connection mode of the contacts must be in the selected logic.
LO = N: contact LO = P: contact LO = N: transistor LO = P: transistor
BN: brown – BU: blue:
For the inputs reserved for sensors, however, the operating mode can be set subsequently based on the type of control
performed by the connected sensor.
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