IDEC FS1A Controller - Manual (Page 51)

5-10
Logic 2: General purpose logic for NO/NC contact inputs
Overview (Logic 2)
This logic function is for using dual channel NO/NC contact devices as safety protective measures
for semiconductor manufacturing machines, food packaging machinery, and other machinery.
This logic has 4 dual channel inputs for NO/NC contact devices and 2 dual inputs for direct
opening inputs.
When all of the safety inputs are in the safe state (for NO/NC contact devices: NO contacts are
ON and NC contacts are OFF (actuators are in installed in the interlock switches), for direct
opening devices: all contacts are ON), safety outputs are turned ON with the start input. While the
safety outputs are ON, if the safe state of any safety input devices is broken (for NO/NC contact
device: NO contact is OFF or NC contact is ON (actuator is removed from interlock switch), for
direct opening inputs: contact is OFF), the safety outputs are turned OFF after the preset
OFF-delay time.