User Manual

3. Installation
3−9
Festo GDCP−SFC−LACI−DN−EN en 0812NH
3.2.1 Function of the hardware enable
Application of 24 VDC to pin 3 (relative to pin 5) of the power
supply connection is essential for operation of the SFC−LACI.
In a
similar fashion to the relay, Hardware Enable" switches
the load voltage on and off, whereby the voltage of the
hardware enable represents the control voltage:
 Hardware enable applied: the load voltage is switched
through.
 Hardware enable missing: the load voltage is blocked.
Switching the voltage on or off of
the Hardware Enable" is
thus equivalent to switching the load voltage on or off.
The Hardware Enable is electrically isolated.
Use of the Hardware enable is
described in section 5.6.9.