Rockwell Automation 61C350 2-In/2-Out 0-10 Volt Analog Rail Module - Manual (Page 31)

4Ć9
4.1.4 Analog In (AIN) and Analog Out (AOUT) Instruction
Blocks
The AIN and AOUT blocks are used, respectively, to read inputs
from and write outputs to the Analog Rail module. AIN and AOUT
Blocks are supported for the 20E processor. The AIN and AOUT
blocks make it possible to update the channels on the Analog Rail
module during the scan instead of at the end of the scan (the
standard AutoMate I/O update). The blocks also make it possible to
update all four channels during the scan in Rail mode, a hardware
configuration which would otherwise allow only one channel on the
module to be updated. The format of the two blocks is shown in
figures 4.11 and 4.12.
AIN Instruction Block
The example below shows an AIN block for an Analog Rail module connected to
port 2 of an AutoMate Processor.
IOPORTĆ Host port to which the Analog Rail is connected (directly or
indirectly); value range 0Ć3.
LHPORTĆ Local I/O Head port to which the Analog Rail is connected; value
range 0Ć3. If a Local I/O Head is not used, the value is 0.
CHAN Ć Channels on the Analog Rail module to read; value range 2 or 3.
DESTĆ Register number where the value of the channel is stored.
12
.01
AIN
[ ] EN EN
ER
AIN
IOPORT:
LHPORT:
CHAN:
DEST:
VALUE:
2
0
3
2000
AutoMate 20E
with ports
0, 1, 2, and 3
Analog Rail with
channels 0, 1, 2, and 3
In Rail Mode
0
1
2
3
Chan 0
Chan 1
Chan 2
Chan 3
13
.01
( )
76
.00
( )
Figure 4.11 Ć AIN Instruction Block