Kataeb
Member
We have an inductive sensor mounted in front of a rotating pulley, which has one small steel part rising close to the sensor.
The sensor is wired to a digital input on a plc, which is checking if the pulley is rotating or not, using two timers (one for ON detection, the other for OFF). The logic is executed at a fixed scan cycle of 100 ms.
Now the Puzzling Phenomena is happening only at a production speed of 80%. The plc is seeing the sensor input as ZERO! Below this speed, and above this speed, all is OK and normal!!
Can anyone explain what is happening here?...
The sensor is wired to a digital input on a plc, which is checking if the pulley is rotating or not, using two timers (one for ON detection, the other for OFF). The logic is executed at a fixed scan cycle of 100 ms.
Now the Puzzling Phenomena is happening only at a production speed of 80%. The plc is seeing the sensor input as ZERO! Below this speed, and above this speed, all is OK and normal!!
Can anyone explain what is happening here?...