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103
Overview of Operations
Section 6-3
6-3
Overview of Operations
Analog I/O Boards convert analog signals (voltage/current) into 4-digit hexa-
decimal data, according to the set range code. They are also used to convert
output data (4-digit hexadecimal) into analog voltage/current signals and out-
put to external devices. Ladder programming is used to set the range code,
read the input conversion data, and set the output data.
Setting I/O Range Codes
The I/O range code is set individually for each analog output or input. The set-
tings are made by writing the following range codes from the ladder program
to the output words allocated to the Analog I/O Board.
Note
1.
Use DIP switch 1 to switch between a voltage current analog input.
2.
When the analog input signal range is 1 to 5 V or 4 to 20 mA, line discon-
nection detection will function.
3.
The range code is set for each input and output.
Words Allocated to Analog I/O Board
Analog I/O Boards are allocated I/O words following those allocated to the
CPU Board or the previously connected Expansion Board.
m: The last input word allocated to the CPU Board or to the previous Board if
one is already connected.
Analog output 1
Input words
Output words
DIP-SW1
Voltage/current input switch
A/D conversion
data (read)
Range code of analog
input/output (set)
D/A conversion
source data (set)
DIP-SW2
Input average processing switch
CPM2B-MAD63
Analog I/O Board
Analog input 1
Analog input 2
Analog input 3
Analog input 4
Analog input 5
Analog input 6
Word
m+1
Word
m+2
Word
m+3
Word
m+4
Word
m+5
Word
m+6
Word
n+1
Word
n+2
Word
n+3
Analog output 2
Analog output 3
Range code
Analog input signal range
Analog output signal range
000
−
10 to 10 V
−
10 to 10 V
001
0 to 10 V
0 to 10 V
010
1 to 5 V or 4 to 20 mA
(See notes 1 and 2.)
1 to 5 V
011
0 to 5 V or 0 to 20 mA
(See note 1.)
0 to 20 mA
100
---
4 to 20 mA
Model
Input words
Output words
CPM2B-MAD63
Words m+1 to m+6 (6 words)
Words n+1 to n+3 (3 words)
CPM2B-MAD42
Words m+1 to m+4 (4 words)
Words n+1 to n+2 (2 words)
CPM2B-MAD21
Words m+1 to m+2 (2 words)
Word n+1 (1 word)
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