Application Manual CDA3000
5-33
5 Software functions
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A
DE
EN
FR
Limit switch evaluation
Limit switch evaluation is based on the evaluation of static signals. No sig-
nal edges are evaluated.
The limit switches are monitored dependent on direction of rotation, so
reversed limit switches are signalled as errors. The drive runs down
uncontrolled.
Mechanical passing of the limit switches is not permitted and is not moni-
tored in terms of plausibility.
Example: If the right side limit switch is approached in clockwise run-
ning, this signal stops the drive. But if this signal is overridden
and the limit switch is no longer damped, the drive starts up
again in the direction of rotation if the clockwise start enable
is still applied.
(1) Mechanical end stop
(2) Limit switches not overridable
(3) Limit switches overridable
Figure 5.10 Limit switch evaluation
Note: The evaluation of pulse switches or upstream limit switches is
not supported. Bridges in limit switches, leads and switch
cabinets are not monitored or detected.
In accordance with EN 954-1 “Safety of machines”, category
B is attained without additional control elements.
(1) (2) (3)
Direction of travel
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