OPERATION MANUAL CompoBus/S

CQM1-SRM21-V1 Master Unit for CQM1 PLCs Section 4-4
4-4-2 Switch Settings
Indicator Status Meaning
IN/OUT (red) ON An error has occurred with an Output Slave.
OFF An error has occurred with an Input Slave or all Slaves
are operating normally.
8421 (red) ON/OFF These indicators represent the four-digit binary slave
number of the Slave in which the error occurred.
DIP Switch
The DIP switch is used to make the PLC word allocation setting and the number
of points/unit number setting.
Reserved (Always OFF.)
Communications mode
Number of points/unit number setting
PLC word allocation setting
Set the PLC word allocations with pins 1 and 2, as shown in the following
table. This is the total number of words allocated to Slaves in the PLC.
Pin 1 Pin 2 Max. number of Slaves setting
OFF OFF 2 words (1 input word, 1 output word)
ON OFF 4 words (2 input words, 2 output words)
OFF ON 8 words (4 input words, 4 output words)
ON ON
The Master Unit is shipped with pins 1 and 2 set to OFF (2 words).
Word addresses are allocated separately for inputs and outputs. The
words are allocated in order from the left of the PLC to the right, just like
regular I/O Units.
Note Always turn OFF the PLC’s Power Supply before changing the setting.
!Caution Always set pin numbers 5 to 6 of the DIP switch to OFF.
Set the number of points/unit number with pin 3, as shown in the following
table.
Pin 3 Number of I/O points/Unit number
OFF 8 points (8-point mode)
ON 4 points (4-point mode)
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