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Program Optimization
ABB Control - AC 31
Page 6-17
1SBC 260400 R1001-b
06.99
5.3.3. Utilization of the function blocks
Use of the function blocks simplifies the communication between the master/slave central units
and enables a large exchange of data.
The data exchange takes place from the master to the slave as well as from the slave to the
master.
A data zone may thereby be transmitted from one central unit to another.
The exchange of a complete data table is totally transparent for the user.
The slave central unit should be configured for CS 31 bus communication, 8 words on
emission and 8 words on reception.
The exchange of words is effectuated 7 words by 7 words at the most , the 8
th
word being
reserved for the handshake which controls the dataflow.
A total of 4 function blocks is required for a transfer from one central unit to another.
The following function blocks are available:
- for the master :
MT_CS31 (data transmission to the slave)
MR_CS31 (data reception from the slave)
- for the slave :
ST_CS31 (data transmission to the master)
SR_CS31 (data reception from the master)
The MT_CS31(master) and SR_CS31(slave) function blocks are used for a data transfer from
the master central unit to the slave central unit (see Figure 6-11).
D AT A
O W xx.07
O W xx.01
DATA
IW 00.07
IW 00.01
SR_C S31
MT_CS31
O W xx.00
IW xx.07
IW 00.00
O W 00.07
Handshake
Figure 6-11 : Data transfer from master to slave
The following information is necessary for these blocks:
- Slave number.
- The number of words to use per exchange : a data table may be transmitted over the CS 31
bus 7 words by 7 words or, 6 words by 6 words or, 5 words by 5 words, etc. It is therefore
possible to use the unused words for a rapid data transfer between central units at each CS 31
bus cycle. The data transfer may therefore be carried out with 2 different time bases. A typical
application is the transfer of parameters from the CS 31 master to the slave 4 words by 4
words, the 3 remaining words being reserved for the rapid transfer of the inputs/outputs. The
available outputs on the master are OWxx.07, OWxx.06, etc. and the corresponding inputs on
the slave are IW00.07, IW00.06, etc. This number should be identical for both functions.
Summary of Contents for AC 31
Page 1: ...Technical Manual Advant Controller 31 40 50 Series 1SBC 260400 R 1001 b ...
Page 7: ......
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Page 45: ...Technical specifications Page 3 2 ABB Control AC 31 1SBC 260400 R1001 b 06 99 ...
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Page 85: ...Installation Page 4 2 ABB Control AC 31 1SBC 260400 R1001 b 06 99 ...
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Page 130: ...Programming ABB Control AC 31 Page 5 21 1SBC 260400 R1001 b 06 99 ...
Page 182: ...Communication ABB Control AC 31 Page 7 11 1SBC 260400 R1001 b 06 99 ...
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Page 218: ...AC 31 technical documentation ABB Control AC 31 Index Page 1 1SBC 260400 R1001 b 06 99 Index ...