OPERATION MANUAL CompoBus/S

CJ1W-SRM21 Master Unit for CJ-series PLCs Section 4-3
108
Set pin 1 (NODE) of the DIP switch as shown in the following table.
Pin 1 setting Usable node number
setting
OFF IN0 to IN7 and OUT0 to
OUT7 (up to 16 nodes
can be connected)
ON IN0 to IN15 and OUT0 to
OUT15 (up to 32 nodes
can be connected)
Maximum
I/O points
128 points
(64 inputs,
64 outputs)
256 points
(128 inputs,
128 outputs)
Words allocated in the
Special I/O Unit Area
10 words (words for one
unit)
Input/output data: 4 input
words and 4 output words
Status information: 2
words
20 words (words for two
units)
Input/output data: 8 input
words and 8 output words
Status information: 4
words
Note 1. The usable node number setting determines the total number of words allocated,
and combined with the DIP switch pin 2 setting, determines the
Slaves’ communication cycle. Refer to 4-1-3 I/O Allocations in CS-series,
C200HX/C200HG/C200HE-(Z)E, and C200HS PLCs for details.
2. When the usable node number setting is set to IN0 to IN15 and OUT0 to
OUT15, the CompoBus/S Master Unit is allocated twice as many words in
the PLC’s Special I/O Unit Area (the words for unit number set on the Master
and the next unit number). The Master’s unit number and the next unit
number cannot be used by another Special I/O Unit mounted to the PLC.
Set pin 2 (DR) of the DIP switch as shown in the following table.
Pin 2
setting
Communications
mode setting
OFF High-speed Communications
Mode
ON Long-distance
Communications
Mode
Communications
distance
Communications
baud rate
Communications
cycle time
100 m max. 750 kbps 0.5 ms (pin 1 OFF)
or
0.8 ms (pin 1 ON)
500 m max. 93.75 kbps 4.0 ms (pin 1 OFF)
or
6.0 ms (pin 1 ON)
Note 1. The communications mode of the Master Unit must match that of all
Slaves. If the CompoBus/S System contains a Slave whose communications
mode does not agree with that of the Master Unit, 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. (In such
cases, the COMM indicator on the Master Unit will light normally.) For information
on the Master Unit indicator statuses, refer to 6-3 Checking Operations
of CS-series and CJ-series Master Units.
2. The setting of pin 2 determines the communications distance, baud rate,
and cycle time as shown in the above table.
Set pin 3 of the DIP switch as shown in the following table.
Pin 3 setting Communications stop mode setting
OFF Communications mode
Continues remote I/O communications when a communications
error occurs.
ON Communications stop mode
Stops remote I/O communications when a communications
error occurs.
If communications stop mode is set, communications automatically stop when
a remote I/O communications error occurs, thereby preventing system malfunctions.