OPERATION MANUAL CompoBus/S

CQM1-SRM21-V1 Master Unit for CQM1 PLCs Section 4-4
130
Setting PLC word
allocation
The following table shows all of the possible combinations of DIP switch settings.
Max. number of
I/O points
Points/n
ode
number
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 following
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 6-5-1 Indicators.
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 communications
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
Usable node
numbers
Pin 1 Pin 2 Pin 3 HighspeedCommunications
Mode
OFF OFF OFF 2 words
(1 IN/1 OUT)
ON OFF OFF 4 words
(2 IN/2 OUT)
OFF ON OFF 8 words
(4 IN/4 OUT)
ON ON OFF
OFF OFF ON 2 words
(1 IN/1 OUT)
ON OFF ON 4 words
(2 IN/2 OUT)
OFF ON ON 8 words
ON ON ON (4 IN/4 OUT)
16 input points,
16 output points
32 input points,
32 output points
64 input points,
64 output points
16 input points,
16 output points
32 input points,
32 output points
64 input points,
64 output points
Pin 4 Communications
mode setting
OFF High-speed Communications
Mode
ON Long-distance
Communications
Mode
8 points IN: 0 and 1
OUT: 0 and 1
8 points IN: 0 to 3
OUT: 0 to 3
8 points IN: 0 to 7
OUT: 0 to 7
4 points IN: 0 to 3
OUT: 0 to 3
4 points IN: 0 to 7
OUT: 0 to 7
4 points IN: 0 to 15
OUT: 0 to 15
Communications
distance
Communications cycle
time
Long-distanceCommunications
Mode
Use of AnalogTerminals
0.5 ms 4.0 ms Possible
(Only for
0.5 ms 4.0 ms Master Unit
models with-
0.5 ms 4.0 ms
V1. Not possible
for
models without
V1.)
0.5 ms 4.0 ms Not possible
0.5 ms 4.0 ms
0.8 ms 6.0 ms
Communications
baud rate
Communications
cycle time
100 m max. 750 kbps 0.5 or 0.8 ms
500 m max. 93.75 kbps 4.0 or 6.0 ms
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.