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© Systeme Lauer GmbH AEG250PX-Expander driver
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D
D3.2 Programming cable PCS 733
PC - PCS Connection
D3.3 Data transfer PCS - PLC
The data traffic with the controller is made in data packages. Each data package
is provided with a checksum. The contents of the checksum is examined for possible
faults by the programmable controller operating system and by the PCS. In
addition, each read and write cycle is provided with a continuous order number.
The PCS is the master during communication. It has the task of establishing the
communication and of sending orders to the programmable controller. PCS and
programmable controller communicate asynchronously via the serial interface (RS
232). Adjustable transmission baud rates are 19200 and/or 9600. 8 data bits are
fixed pre-defined, ODD parity, 1 stop bit for communication via the programming
unit interface.
Only the interchange of data packages is described in this manual.
Structure of the reading cycle:
PCS PROGRAMMABLE CONTROLLER
READ N BYTES →
← ANSWER N BYTES
...
(REPETITION CORRESPONDING TO THE DATA FIELD)
...
READ N BYTES →
← ANSWER N BYTES
Communication
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