Addressing Slave Central Units - ABB AC 31 Technical Manual

ABB Control - AC 31
1SBC 260400 R1001-b 06.99
Installation
50
CS 31 bus
series
interface
master
62
RU
X
RU
Addresses X+4

5.3.2. Addressing slave central units

Information exchanges between a master central unit and a slave central unit isn't limited to
the exchange of physical input/output variables. It is possible to exchange a data table, whose
size may be defined in bits or words, as follows:
- bit exchange in 8 bit packets (1 byte) = from 2 bytes to 15 bytes.
Address = ( 0 ≤ Y ≤ 61 )
- word exchange from 1 to 8 words. Address = ( 0 ≤ Y ≤ 61 )
(see chapter 6 - Program Optimization).
The addressing of the slave central unit is done in the AC31GRAF software.
The addressing of the central unit extensions is independent of the CS 31 bus addressing. It is
defined and managed by the slave central unit.
50
series IW /
master OW
62 63
CS 31
bus
interface
RU
X X+1
50
series
slave
Y
IW
IW / O I
OW
63 63 64 63
I O IW/ I/O
OW
X+1 X+1 X.00 X+2 X+3 X.04
to
X.03
I O IW I/O
X+5 X+5 X+4.00 X+6 X+7 X+4.00
to
X+4.07
O IW I O
63 64 63 64
I I I/O I O
X+2 X+3 X+4 X+4 X+5
O I/O
I I IW/
OWI
63 64 63 63 65
O I
64 64 Addresses
O IW/
OW
Addresses
to
X.07
O OW
to
X+4.07
I
64 Addresses
O
Addresses
O
66 Addresses managed by the
slave central unit
Page 4-23