
B–63783EN/01
6. CONNECTION OF I/O UNITS TO
MACHINE INTERFACE
89
7
X
Module internal address
Yn
Yn+1
X
6
X
X
5
X
X
4
X
X
3
X
X
2
X
X
1
X
CHB
0
X
CHA
Specifying a pair of values listed below for CHA and CHB causes the
corresponding channel to be selected, thus enabling the A–D conversion
and selection data for the channel to be read as DI data. Letter X in the
above table indicates a bit not in use. It can be either 0 or 1.
CHB CHA Channel to be selected
0 0 Channel 1
0 1 Channel 2
1 0 Channel 3
1 1 Channel 4
(About the addresses)
The first address for X (DI) of the basic modules containing an analog
input module must be even–numbered. With this assignment, the digital
output address of the analog input module is determined based on the
space where it is mounted, as listed below.
D If the analog input module is mounted in the space for expansion
module 1 (m is the top address assigned)
76543210
Undefined
D07 D06 D05 D04 D03 D02 D01 D00
0 0 CHB CHA D11 D10 D09 D08
Module internal address
Xm+3 (odd address)
Xm+4 (even address)
Xm+5 (odd address)
D If the analog input module is mounted in the space for expansion
module 2 (m is the first assigned address)
76543210
D07 D06 D05 D04 D03 D02 D01 D00
0 0 CHB CHA D11 D10 D09 D08
Undefined
Module internal address
Xm+6 (odd address)
Xm+7 (even address)
Xm+8 (odd address)