Specifications

IP 240 Position Decoding
If the direction is reversed outside the hysteresis range following switching of an output, the
switching point at the track limit is retained ( Fig. 7-7).
Fig. 7-7. Resetting of an Output Following a Reversal of Direction Outside the Hysteresis Range
Entry into the track
LT - H LT
LT Lower track limit
LT - H Lower track limit - hysteresis
Actual
value
Exit from the track
Reversal of direction
Output
Dn
Output
Dn
Actual
value
If the direction is reversed within the hysteresis range following switching of an output, the
hysteresis offsets the switching point by the value of the hysteresis.
a) Resetting of an output
Fig. 7-8 shows how an output is switched upon entry and upon exiting of the lower track limit.
The output is set when the lower track limit is exceeded, and the specified hysteresis value
goes into force for this limit. The direction is reversed within the range of the hysteresis. The
output is reset when the actual value reaches the ”lower track limit - hysteresis”.
Fig. 7-8. Resetting an Output Following a Reversal of Direction Within the Hysteresis Range
LT - H LT
LT Lower track limit
LT- H Lower track limit - hysteresis
Exit from the track
Entry into the track
Actual
value
Output
Dn
Ouput
Dn
Actual
value
Reversal of direction
EWA 4NEB 811 6120-02a 7-11