Panasonic SG-P Series Instruction Manual page 37

3.3 Connecting the Switch Body with the Controller and Power Supply Unit
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For NPN output
(Note 1) For connecting multiple units, connect the "check output line (gray)" with the "check input line (pink)"
SG-P□□-S sub unit connected next. Connect the "check output line (gray)" of the SG-P□□-S sub unit
connected at the end with the "check input line (pink) " of the SG-P□□-M standard unit placed at the
beginning.
WUME-SGPUM-2 3-11