Input lters for the 24-V count inputs
For the purpose of suppressing interference, you can parameterize input lters with a uniform
lter time for the 24 V inputs A*, B* and N* and for the digital inputs. Input lters available:
Table 9-3 Input lters
Features Input lter 1
(default)
Input lter 2
Typical input delay 1 µs 15 µs
Maximum count frequency 200 kHz 20 kHz
Minimum pulse width of count signals 2.5 µs 25 µs
Monitoring encoder signals
The 24-V count signals are not monitored to detect wire-breaks or short-circuits.
Coding plug (only for FM 350-1)
To operate this encoder, insert the coding plug in position D.
9.5 Signal evaluation
Overview
The counter module supports the count of signal edges. It usually evaluates the edge at A (A*)
(single evaluation). Options in the program of increasing the resolution:
• Single evaluation
• Double evaluation
• Quadruple evaluation
Multiple evaluation is only supported for 5-V incremental encoders which return the A and B
signal with a phase shift of 90°, for 24-V incremental 24 V encoders with a phase shift of 90° of
the A* and B* signals.
Single evaluation
In this mode, the module evaluates only one edge of signal A. Up count pulses are recorded at
the positive edge at track A, and if track B is low. Down count pulses are recorded at the positive
edge at track A, and if track B is low.
The diagram shows a single evaluation of signals:
Encoder signals and their evaluation
9.5 Signal evaluation
Counter module FM 450-1
Equipment Manual, 03/2022, A5E03648739-AC 83
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