Specifications

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A-35
A LAUER driver
Communications cable PCS 736 For each interface, the connection is made via 2 TTY channels. The line
currents for both channels are supplied by the PCS operating console.
Thus, the programmable controller is galvanically isolated.
When using shielded standard cable (2 * 2 * 0.14, untwisted) the following
recommended maximum length apply:
19200 baud 10 meters
9600 baud 20 meters
4800 baud 40 meters
1200 baud 160 meters
When using low-capacity data cables twisted in pairs the 10-fold lengths
can be projected (example: Belden cable 8723; alternative: 2-fold foil
shielded 4-wire 2*2*0,2 mm cables twisted in pairs).
Interrupting the connection is registered by the PCS operating console
and shown on the PCS 830.3 display (status „St.x“). The fault is indicated
in the error word (DW3) for the further evaluation.
Screening
Connector hoods are used, the shield may also be connected to pin 1,
but this is not recommended due to interferences, because the data lines
should be completely covered by the shield (if possible). It should be
noticed, however, that grounding on both sides may require an
equipotential bonding conductor with a cross section of 10 times that of
the shield (in order to compensate for ground potential variations and to
prevent equalizing currents on the cable shield)! This is especially
important, if the PCS and the programmable controller are not connected
to the same common point (if they are for example installed in different
control cabinets).