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CQM1-SRM21-V1 Master Unit for CQM1 PLCs Section 4-4
4-4-2 Switch Settings
DIP Switch
The DIP switch is used to make the PLC word allocation setting and the num-
ber of points/unit number 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.
• 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.
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.
Indicator Status Meaning
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
Reserved (Always OFF.)
PLC word allocation setting
Number of points/unit number setting
Communications mode
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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