2
Overview
Festo – EXCM-30/-40-...-PF-EN – 1603 – English
11
2.5
Switch-off functions of the controller
The drive can be switched off through the switch-off functions Safe Torque Off (STO) and External Stop
(ESTOP).
Logic voltage
Driver supply
Activation/shut-down of the driver supply
Driver supply
monitoring
Driv
er supply
ackno
wledgment contact
PWM driver
step
IGB
T
output stage
μP
+24 V
GND
STO1
DIAG1
DIAG2
ESTOP
STO2
Fig. 2.3
Switch-off functions - block diagram
2.5.1
External stop ESTOP
If the External Stop - ESTOP switch-off function is requested, the motors are decelerated with the quick
stop braking ramp (Quick Stop) until they are at rest. After standstill is reached, the brake control is
activated and the output stage switched off.