130
CQM1-SRM21-V1 Master Unit for CQM1 PLCs
Section 4-4
The following table shows all of the possible combinations of DIP switch set-
tings.
Note
When the CQM1 Master Unit is used in 4-point mode, Slaves with 16 points or
more cannot be used. If Slaves with 16 points or more are used, a data area
overlap error (ERS indicator lit) will occur.
Set the communications mode with DIP switch pin 4 (DR), as shown in the fol-
lowing table.
Note
1.
Make sure that the communications mode of the Master Unit is the same
as that of all the Slaves. If the CompoBus/S System contains a Slave with
a different communications mode, the COMM indicator on that Slave will
not light, and normal communications with that Slave will not be possible.
Other Slaves will not be adversely affected, and the COMM indicator on the
Master Unit will light normally. For information relating to the states of the
Master Unit indicator, refer to
.
2.
When using a previous Master Unit model (without V1), pin 4 must be set
to OFF. Otherwise, normal communications may not be possible.
3.
Pin 4 is factory-set to OFF (High-speed Communications Mode).
4.
The settings for the communications distance, baud rate, and communica-
tions cycle time vary according to the setting of pin 4, as shown in the
above table.
4-4-3
I/O Allocations in CQM1 PLCs
In CQM1 PLCs, the Master Unit is treated just like an I/O Unit that has both
inputs and outputs, so the Slave’s I/O data is stored in the words allocated to
those inputs and outputs.
Setting
PLC word
allocation
Max. number of
I/O points
Points/n
ode
number
Usable node
numbers
Communications cycle
time
Use of Ana-
log Termi-
nals
Pin 1 Pin 2 Pin 3
High-
speed
Communi-
cations
Mode
Long-dis-
tance
Communi-
cations
Mode
OFF
OFF
OFF
2 words
(1 IN/1 OUT)
16 input points,
16 output points
8 points
IN: 0 and 1
OUT: 0 and 1
0.5 ms
4.0 ms
Possible
(Only for
Master Unit
models with-
V1. Not pos-
sible for
models with-
out V1.)
ON
OFF
OFF
4 words
(2 IN/2 OUT)
32 input points,
32 output points
8 points
IN: 0 to 3
OUT: 0 to 3
0.5 ms
4.0 ms
OFF
ON
OFF
8 words
(4 IN/4 OUT)
64 input points,
64 output points
8 points
IN: 0 to 7
OUT: 0 to 7
0.5 ms
4.0 ms
ON
ON
OFF
OFF
OFF
ON
2 words
(1 IN/1 OUT)
16 input points,
16 output points
4 points
IN: 0 to 3
OUT: 0 to 3
0.5 ms
4.0 ms
Not possible
ON
OFF
ON
4 words
(2 IN/2 OUT)
32 input points,
32 output points
4 points
IN: 0 to 7
OUT: 0 to 7
0.5 ms
4.0 ms
OFF
ON
ON
8 words
(4 IN/4 OUT)
64 input points,
64 output points
4 points
IN: 0 to 15
OUT: 0 to 15
0.8 ms
6.0 ms
ON
ON
ON
Pin 4
Communications
mode setting
Communications
distance
Communications
baud rate
Communications
cycle time
OFF
High-speed Com-
munications Mode
100 m max.
750 kbps
0.5 or 0.8 ms
ON
Long-distance
Communications
Mode
500 m max.
93.75 kbps
4.0 or 6.0 ms