3.9.2
Connection of digital sensors
A digital sensor can be connected to any of the inputs. Both bits in a two bit sensor are to be
connected to input channels within the same 8-16 bit group. The connection is to be made to
two input channels next to each other, with the lowest bit connected to the input channel with
the lower number.
Up to three one-bit sensors for distance searching can be connected to the sensor inputs of the
safety board. These inputs have faster response time, 12 ±5 ms compared to 12 (-5 +15) for the
digital inputs. The inputs are supplied with +24 V voltage in the same way as for digital I/O.
Sensor inputs on the system board cannot cope with input signals with pulse widths between
0.2 and 4 ms. It is therefore important to use transducers with hysteresis, intended for
industrial environments.
Certain proximity transducers can give showers of pulses where they are at the change-over
point or if the supply voltage is disturbed.
CONNECTION TABLE - Signals from one-bit sensors via the safety board
User contact XS3 or XT3
Signal name Function Terminal Note
SENSOR 1 See Programming manual D10 logical input 237
SENSOR 2 See Programming manual Dll logical input 238
SENSOR 3 See Programming manual D12 logical input 239
0 V SENSOR 0 V, supply to SENSOR inputs D13
3.9.3
Connection of analog sensors
An analog sensor can be connected to any analog input on the analog I/O board.
INSTALLATION S3
3:20
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