IDEC FS1A Controller - Manual (Page 61)

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Logic 3: General purpose logic for machines with openings
Overview (Logic 3)
This logic is for using safety devices with dual channel solid state outputs, such as safety light
curtains, for safety protective measures of production machinery, robots, and other machinery.
This logic enables the connection of 2 dual channel solid state output (PNP) devices and 4 dual
channel direct opening inputs.
When in this state all of the safety inputs are receiving safety input signals (24V DC is applied
from the solid state output devices, and the all contacts of contact devices are closed), the
safety outputs are turned ON upon input of the start input. If any of the safety input signals is cut
OFF while the safety outputs are ON, the safety outputs are turned OFF after the preset
OFF-delay time.