
B–63083EN/02
9. CONNECTION TO FANUC I/O Link
142
NOTE
This analog input module has four input channels. The
digital output section consists of a group of 12 bits within the
three–byte occupied input points. This means that the
channel to be used can be dynamically selected by the
ladder. The channel switching DO point for channel
selection is included in the two–byte occupied output points.
(Digital output)
This digital input module has four input channels. The digital output
section consists of a group of 12 bits within the three–byte occupied input
points. The output format is indicated below.
7
D07Xm (even–numbered address)
0
6
D06
0
5
D05
CHB
4
D04
CHA
3
D03
D11
2
D02
D10
1
D01
D09
0
D00
D08Xm+1 (odd–numbered address)
Address in the module
D00 to D11 represent 12–bit digital output data. D00 and D11 correspond
to weightings of 2
0
and 2
11
, respectively.
D11 is a sign bit expressed as a two’s complement. CHA and CHB
represent analog input channels.
This means that when the two bytes above are read with a PMC program,
the A–D converted data of the CHA and CHB input channels can be read
from D11 to D00. For CHA and CHB, see the description of channel
selection, below.
Section 6.3 provides notes on reading data with a PMC program.
(Channel selection)
With this analog input module, which of the four channels is to be output
to the digital output section must be determined with a PMC program.
The DO points used for this selection are CHA and CHB (two–byte
occupied output points). These are mapped as indicated below.
7
XYn
X
6
X
X
5
X
X
4
X
X
3
X
X
2
X
X
1
X
CHB
0
X
CHAYn+1
Address in the module
By writing the values indicated below to CHA and CHB, the
corresponding channel is selected, and the A–D converted data of the
channel and the data of the selected channel can be read as DI data. The
character X indicated above represents an unused bit, so that either 1 or
0 may be written in place of X.
CHB CHA Channel selected
0 0 Channel 1
0 1 Channel 2
1 0 Channel 3
1 1 Channel 4
9.4.14
Analog Input
Specifications