Festo CAMC-G-S3 Manual page 51

2 Product description of safety module CAMC-G-S3
Active sensors (two-channel)
Active sensors are units with two-channel semi-conductor outputs (OSSD outputs). The safety module
supports active sensors with equivalent / antivalent output signals as well as with / without test pulse
outputs. Through the integrated safety design of the CMMP-AS-...-M3 series, test pulses to monitor the
outputs and cables are approved. Sensors switching plus/minus switch the plus and minus cable or
signal and earth cable of a sensor signal.
The outputs must switch simultaneously. Irrespective of this, safety functions are triggered as soon as
at least one channel is switched.
Examples of active sensors:
– light curtain
– laser scanners
– controllers
These errors are detected by active sensors:
– antivalent or equivalent input signals after the discrepancy time has elapsed, depending on the
sensor type and parameterisation
Passive and active sensors (single-channel)
Single-channel sensors are used for sequence control and for feedback and diagnostics.
Examples of passive sensors:
– acknowledgment contact of an external clamping unit,
– pushbutton to acknowledge pending errors,
– pushbutton for restart.
Combinations of single-channel sensors can also be used to control safety functions, for example:
– mode selector switch (1 of N selection).
These errors are detected by single-channel passive sensors:
– on supply via a safe output of the safety module:
Cross-circuits and shorts to +24 V and 0 V through the lack of the test pulses
Approved sensor types
Tab. 2.14 shows an overview of the approved sensor types at the digital inputs.
Festo – GDCP-CAMC-G-S3-EN – 1406NH – English 51