Communication; Communication Between Basic Units On The Cs31 System Bus; Addressing In The Cs31 System Bus; Defining The Communication Data - ABB 07CR41 Operating Manual

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Communication

6.1 Communication between basic units on the CS31 system bus

6.1.1 Addressing in the CS31 system bus

6.1.2 Defining the communication data

Advant Controller AC 31 / Issued: 01.99
The 50 series basic units have a CS31 system bus interface. They can either be used in the
MASTER mode of operation or, instead of an extensible remote unit or I/O device, as a
SLAVE.
With this configuration you can improve performance considerably if part of the process is
processed locally. Program execution is much quicker and availability is improved, for a slave
can continue to control its own local process independently.
The configuration of the basic unit as a master or slave is done via the system constant
KW 00,00.
The following CS31 addresses are permitted:
Master basic unit
50 series
90 series
A slave basic unit is regarded as a digital or analog input/output unit by the master basic unit.
The volume of data which is exchanged between the master and the slave basic units for
every CS31 bus cycle can be defined via the configuration. To optimize communications times
on the CS31 system bus, this value should be selected in accordance with the actual data
volume transferred.
The maximum number for a bit configuration is 120 inputs and 120 outputs and the maximum
for an analog configuration is 8 word inputs and 8 word outputs.
These settings are made in the system constants KW 00,10 and KW 00,11.
•
Size of the transmitting area of the slave basic unit
Absolute identifier:
Symbolic identifier:
Meaning of the value of the constants:
The slave basic unit can be used either in the binary area or word area at the CS 31
system bus. The digital values are transferred byte by byte. It is possible to set the number
of bytes (or words) which are to be sent from the slave basic unit to the master basic unit.
For use in the digital area:
Transmitting: 2...15 bytes
For use in the word area:
Transmitting: 1...8 words
Default value:
Range of values:
Changes to these system constants take effect:
on the next warm start or
on the next cold start
Slave basic unit
50 series
digital analog
0 to 61 0 to 61 0 to 61
0 to 61 0 to 5 0 to 61
KW 00,10
SLV_SEND
2...15
101...108
4
2...15 and 101...108
6 – 1
90 series
digital analog
0 to 5
0 to 5
Communication
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