IFM Electronic DA102S - Y7 Transistor Output; Pulse Pick-Ups (Sensors); Sensor Monitoring; Pulse Comparison Input 1 and 2

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5.6 Y7 transistor output
The Y7 transistor output provides a non-safety related signal for communication to
a PLC.
Status Y7 transistor output
Normal operation (no error) HIGH (ON)
Error LOW (OFF)
The output data is compatible with the input data of the current-sinking inputs of
type 1, 2, 3 to EN 61131-2.
5.7 Pulse pick-ups (sensors)
2 pnp-switching sensors with the "normally open" output function are connected to
the device as pulse pick-ups.
The position of the sensors and the mechanical design of the cams are not
arbitrary since one sensor must always be damped.
(→6.3Arrangementofthedampingcams)
5.8 Sensor monitoring
In order to prevent faulty standstill signalling, the sensors are permanently
monitored during operation of the installation.
5.8.1 Pulse comparison input 1 and 2
By permanently comparing the pulses it is evaluated whether the pulse sequences
of both sensors differ from each other.
If during operation a mechanical or electrical error causes one sensor to fail, there
willbeaninterruptionoftheotherwiseidenticalpulsesequence(f1≠f2).
In accordance with "safe" standstill monitoring this is not considered as
underspeed.
The output relays K1/K2 do not switch, there is an error message.
5.8.2 Mechanical requirements on damping cams and gaps
The arrangement of the mark-to-space ratio of the damping cams and gaps
ensure that at least one sensor is damped all the time.
Therefore the gap between the damping cams must not be of a size that both
sensors face a gap at the same time and are not damped.