Siemens SIMATIC FM 452 Manual page 135

10.2 Initiators
Initiators are simple switches without direction information that output pulses. You
specify the direction with the machine data for selecting the initiator.
Caution
!
Damage to equipment is possible.
Specifying a direction incorrectly can lead to serious errors in the system (for
example as a result of incorrectly activating units.
Check the direction information each time you install and start up a system and
whenever you replace an initiator.
Connectable Initiators
You can connect the following initiators to the FM 452:
Initiators with 24 V level (Proximity Switches)
Limit Frequency = 50 kHz
max. 100 m cable length
Signal Evaluation
With an initiator, the rising edge of Signal A* is counted.
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Encoders
10-5