7. Electrical installation
Festo P.BE-CMMP-AS-3A-HW-EN 0708NH
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An unshielded cable is often sufficient for the 24 V signals. In environments with heavy
interference and with long cables (l > 2 m) between the control system and the CMMP-AS
servo positioning controller, Festo recommends using shielded control cables.
Despite the differential nature of the CMMP-AS servo positioning controller analog inputs,
unshielded cables are not recommended for the analogue signals because the interfer-
ence, e.g. from switching breakers or the converter end stages, can reach high levels. They
influence the analogue signals and cause common-mode interference, which can result in
deviations in the analogue measurements.
With short cables (l < 2 m, cabling inside the switching cabinet) the outer PE shield at both
ends is sufficient to provide interference-free operation.
For the best possible interference suppression of the analogue signals, the individual ana-
log signal conductors should be shielded. One end of the inner cable shied is connected to
AGND (Pin 1 or 14) of the CMMP-AS servo positioning controller. It can also be connected
at both ends in order to achieve a connection between the control system and CMMP-AS
servo positioning controller reference potentials. Pins 1 and 14 are directly connected to
each other in the controller.
7.5.5
Connection notes [X1]
The digital inputs are designed for 24V control voltages. The high signal level already of-
fers a high degree of interference immunity for these inputs. The CMMP-AS servo position-
ing controller provides a 24 V auxiliary supply, which can be loaded to a maximum of
100 mA. The inputs can thus be directly controlled via switches. They can, of course, also
be controlled using 24 V PLC outputs.
The digital outputs are implemented as so-called "high side switches". This means the
24 V supply of the CMMP-AS servo positioning controller can be directly switched to the
outputs. Loads such as lamps, relays etc. are switched to GND24 by the output. The four
outputs DOUT0 to DOUT3 can each supply a maximum load of 100 mA. The outputs can
also be directly connected to 24 V PLC inputs.
Summary of Contents for CMMP-AS-C2-3A
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