Specifications

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B-10
B Buep 19-Expander driver
Screening
The shield should be connected on both sides to a metallized connector
hood. If non-metallized 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 earthing 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 earth 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).
Programming cable PCS 733 Connection PLC to PCS
Use this cable for the programming (loading of the driver and user pro-
gram) of the PCS.
Data transmission PCS - PLC Data transfer between the PCS and the programmable controller is ef-
fected in data packets. Each data packet is assigned a checksum (CRC).
The package content is checked for possible errors by the programmable
controller operating system and the PCS. Each packet consists of a mini-
mum of one sub-packet which performs a clearly defined task. The tasks
to be integrated in a packet are determined by the PCS based on numer-
ous single criteria. A criterion represents the importance of a task. Each
of these tasks is assigned a specific start priority. Priority management
assures that no task is lost. The highest priorities are processed first.
These priorities have nothing in common with the priority management
(PCS manual)! The indicated packet lengths refer to words, including
header. Data word 13 is used to prevent transmission of specific data
words (PCS manual).