SICK MSM Instrucciones De Operación página 186

Operating
Instructions
MSM
Explanation
Note
8 008 329/O371/05-04-04 © SICK AG • Industrial Safety Systems • Germany • All rights reserved
186
Product description
Technical requirements for testable sensors
Ÿ
Test in active state (when material activates sensor).
Ÿ
Sensor output signal "LOW" in active state.
Testing function
To ensure the muting sensor is functioning and connected,
when the muting sensor is active (see Fig. 4 and Fig. 5) and on
changeover from HIGH to LOW signal a brief test signal (LOW
signal) is sent to the sensor every 20 minutes and a HIGH
signal at its output is awaited in reply. The test pulse lasts
30 ms and has no effect on the muting function.
Advantages of testable sensors
Ÿ Additional security against manipulation
Ÿ Defects in the muting sensor are revealed
Output
Muting sensor
LOW
HIGH
Muting condition
Met
Not met
Section 3