ABB AC 31 - Page 169

Program Optimization
Page 6-16 ABB Control - AC 31
1SBC 260400 R1001-b 06.99
The master central unit will send the analog information to the slave central unit via the
OWxx.00 to OWxx.M outputs, (M+1) being the number of words to transmit from the master
central unit to the slave central unit.
The slave central unit will receive the information in the IW00.00 to IW00.M inputs.
The N and M values may differ but have to be between 0 and 7.
For example : the transmission of the word value "VALUE1" from the slave 4 central unit to
the master central unit and the transmission of the word value "VALUE2" from the master
central unit to the slave 4 central unit.
The program is:
- In the master central unit:
VALUE1
%OW04.05VALUE2
%IW04.00
word emission in %OW04.05
word reception in %IW04.00
- In the slave central unit at address 4:
VALUE2
%OW00.00VALUE1
%IW00.05
word emission in %OW00.00
word reception in %IW00.05