OPERATION MANUAL CompoBus/S

CJ1W-SRM21 Master Unit for CJ-series PLCs Section 4-3
4-3-2 Switch Settings
Rotary Switches The rotary switches are used to set the Master Unit’s Special I/O Unit number
as a decimal number.
The range of usable node number settings (set using pin 1 of the DIP switch)
are listed in the following table.
DIP switch
pin 1 (NODE)
Usable node number setting Unit number
setting range
OFF IN0 to IN7 and OUT0 to OUT7
(When using the words for one Special I/O Unit (10
words))
ON IN0 to IN15 and OUT0 to OUT15
(When using the words for two Special I/O Units (20
words))
Any unit number in the ranges above can be set, as long as the same unit
number has not been set on another Special I/O Unit mounted in the PLC. Set
the unit number with a small standard screwdriver; be careful not to damage
the switch.
!Caution Always turn the PLC OFF before changing the unit number setting.
The Master Unit is shipped with the unit number set to 00.
The unit number setting determines which words in the PLC’s Special I/O
Unit Area and DM Area are allocated to the Master Unit. Refer to 4-1-3
I/O Allocations in CS-series, C200HX/C200HG/C200HE-(Z)E, and
C200HS PLCs for details.
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.
If the same unit number is used for the Master and another Special I/O
Unit, an I/O UNIT OVER error will occur in the PLC and it will not be possible
to start up the CompoBus/S System.
DIP Switch The DIP switch is used to set the range of usable node numbers of Slaves, the
communications mode, communications stop mode, and Slave registration
function.
4
3
2
1
ON
MACH
No.
x10 1
Note 1. Always turn the PLC OFF before changing the settings.
2. DIP switch pins 1 to 4 are all set to OFF at the factory.
0 1 2 3 4 5 6 7 8 9
0 1 2 3 4 5 6 7 8 9
0
x10
Slave registration function
Communications stop mode
Communications mode
Usable node numbers
0 to 95
0 to 94
107