Panasonic SF4-AH Series Instruction Manual page 75

Emission halt
function
PSDI
© Panasonic Industrial Devices SUNX Co., Ltd. 2013 MJE-SF4A No.0038-55V
This function enables checking of the receiver operation by turning off light
emission.
It is possible to halt emission by keeping the terminal open or 0 to +1.5V,
and to have normal emission by connecting it to +9V to Vs. (Vs is the same
voltage as the voltage of the power supply to be used.)
The abbreviation for the Presence Sensing Device Initiation.
The safety device that restarts automatically without any operation by the
operator after the device detects danger status and halts for a while.
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