Festo Контроллеры двигателя SFC-LAC - Manual (Page 63)

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:
ć Hardware enable applied: the load voltage is switched
through.
ć 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.