With the signal polarity parameter you can physically adapt the inputs of your System
SLIO safety module to the signal polarity of your sensor for 2-channel evaluation. The 1.
channel always supplies the current input signal of the sensor. Independent of the signal
polarity, in the safety control system the resulted input value (corresponds to the polarity
of the 1. channel) is passed to both input bits of a channel group.
n
With
equivalent
signal polarity the 2. channel supplies the same value as the 1.
channel.
n
With an
antivalent
signal polarity the signal is inverted by the 2. channel of the sensor.
Antivalent signals are used, e.g. in the wiring of security doors. By this way simple
manipulations can be prevented.
n
During the switching operation of 2-channel sensors, temporarily both channels do
not supply the same signal state. With the
discrepancy time
you can set the time until
both channels have valid values after switching.
n
If the discrepancy time is exceeded, the System SLIO safety module switches to the
fail-safe state.
n
It is valid for electrical and electromechanical sensors:
Discrepancy to be set
= real signal discrepancy (switch and bounce time of the
sensor) + set
Input smoothing time
+ 7 ms
n
It is valid for active sensors with semiconductor output (and own test pulse genera-
tion):
Discrepancy to be set
= real signal discr set
Input smoothing time
* 3 + 4 ms
Please consider with mechanical sensors and increasing abrasion by e.g.
contact bounce, the discrepancy time increases and this is reported as
error by the System SLIO safety module.
In this case, in order to avoid failure of a sensor, during operation a
defective sensor must immediately be changed!
This parameter allows you to define how you can acknowledge a discrepancy error.
n
With 0 of this parameter, a discrepancy error can only be acknowledged when the
sensor supplies 0 signal. For example, an emergency stop switch must be pressed.
n
With 1 of this parameter, a discrepancy error can only be acknowledged when both
sensors supply a valid signal state (depending on the parametrization equivalent or
antivalent).
Chap. 3.17 ‘Sample application’ page 117
Signal polarity
Discrepancy time
Reintegration after dis-
crepancy error
VIPA System SLIO
Product description
SDI 4xDC 24V - FSoE Parameter record set > FSoE application parameters
HB300 | SM-S | 02x-1SD10 | en | 20-02
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