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Connecting to the RS-232C Port at the Host Section 4-1
Allocation DM Area Settings for CPU Unit
Settings are written from the Programming Device (a Programming Console
or CX-Programmer) directly into the allocation DM area (system setting area)
of the CPU Unit. After the settings are written, they become effective by turn-
ing the power ON, restarting the Unit, restarting the communications port, or
execution of the STUP command.
In the following, the channel numbers of the allocation DM area and the set-
tings are shown.
m=DM30000+100
×unit # (CH)
When Using the NT Link
(1:1) Method
Compatible Host Units
Some models and series of OMRON PLCs have the NT link (1:1) function
built in. With CQM1H PLCs, a Serial Communications Board can be added to
provide 1:1 NT Link communications. Some C200HX/HG/HE(-Z)E CPU Units
can be connected by the NT link (1:1) method by installing a Communications
Board.
Check the model and series of the PLC against the type of CPU Unit before
making the connections.
SCU21
RUN
ERC
SD1
RD1
RDY
ERH
SD2
RD2
No.
F
E
D
C
B
A
9
8
7
6
5
4
3
2
1
0
UNIT
Set the unit number to 0 through F so that
it will not overlap with the numbers used in
other units.
Allocation DM area (CH) Writing Value Settings
Port 1 Port 2
m m+10 8000 Host link mode, 2 stop bits, even parity, data
length 7 bits
m+1 m+11 0000 Communications speed 9600 bps.
0007 Communications speed 19200 bps.
m+2 m+12 0000 Transmit delay time 0 ms.
m+3 m+13 0000 No CTS control Unit No.0 for host link