I/O Wiring Considerations; Exchanging Data With The Cpu Unit; Outline Of Data Exchange - Omron CS1W-AD041-V1 Operation Manual

Exchanging Data with the CPU Unit

7-4-5

I/O Wiring Considerations

7-5 Exchanging Data with the CPU Unit
7-5-1

Outline of Data Exchange

CJ-series CPU Unit
2000 + n x 10
10
words
2000 + n x 10 + 9
D20000 + n x 100
100
words
D20000 + n x 100 + 99
n: Unit number
When wiring inputs, apply the following points to avoid noise interference and
optimize Analog I/O Unit performance.
• Use two-core shielded twisted-pair cables for external connections.
• Route I/O cables separately from the AC cable, and do not run the Unit's
cables near a main circuit cable or a high voltage cable. Do not insert out-
put cables into the same duct.
• If there is noise interference from power lines (if, for example, the power
supply is shared with electrical welding devices or electrical discharge
machines, or if there is a high-frequency generation source nearby) install
a noise filter at the power supply input area.
Data is exchanged between the CPU Unit and the CJ1W-MAD42 Analog I/O
Unit via the Special I/O Unit Area (for data used to operate the Unit) and the
Special I/O Unit DM Area (for data used for initial settings).
I/O Refresh Data
Analog input conversion values, analog output set values, and other data
used to operate the Unit are allocated in the Special I/O Unit Area of the CPU
Unit according to the unit number, and are exchanged during I/O refreshing.
Fixed Data
The Unit's fixed data, such as the analog input signal ranges and analog out-
put signal ranges, is allocated in the Special I/O Unit DM Area of the CPU Unit
according to the unit number, and is exchanged when the power is turned ON
or the Unit is restarted.
Special I/O Unit Area
Analog inputs
Analog outputs
:
DM (Data Memory) Area
Input signal range
Output signal range
Power ON or
:
Unit restart
CJ1W-MAD42 Analog I/O Unit
I/O Refresh Data
Exchanges normal data
such as analog inputs and
analog outputs.
I/O refresh
Fixed Data
Transmits initial settings
such as analog input
ranges and analog output
ranges.
Section 7-5
See 7-5-6 I/O
Refresh Data
Allocations for
details.
See 7-5-5 Fixed
Data Allocations
for details.
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