2 Description of the safety function STO
Festo – GDCP-CMMS-AS-G2-S1-EN – 1306NH – English 15
2.2.2 Overview of interfaces [X1] and [X3]
The motor controller has control por ts for requesting the safety function at the following interfaces
Section 3.2:
– 25-pin connection [X1] on the top side with the control port (1st switch-off path) and the controller
enable control port (for implementation of the SS1 function in combination with an externally safe
time relay).
– 6-pin connection [X3] on the bottom with a control port (2nd switch-off path), an ac knowledgment
contact and a 24 V auxiliary supply for external sensors.
A safety circuit for additional interfaces on the CMMS-AS-...-G2 motor controller is neither required nor
intended.
Tab. A.6 in Appendix A.1.3 describes the technical data for the control ports.
Cross-circuit detection in the input c ircuit is not carried out by the motor controller. The
inputs have no tolerance against test pulses (OSS D).
Inter-
face
Port Description
Pin Designation
[X1] 6 GND24 Reference potential for digital inputs and outputs
9 DI N 5 Controller enable (high active)
18 +24 V 24 V supply provided
21 DIN 4 Output stage enable (high active)
[X3] 1 24 V Auxiliary power supply (24 V DC logic supply of the motor controller
provided).
2 Rel Activation of driver supply relay
High = driver supply switched on
Low = “pulse blocker” active, driver supply switched off
3 0V Reference potential for digital inputs and outputs.
5 1(NC1)Acknowledgment contact for the status “Safe Torque Off ” ( STO)
– Acknowledgment contact closed = “Safe Torque Off” (STO) active
(or controller switched off)
6 2(NC2)
Tab. 2.2 Function of the connections
For STO in category 3‚ PL d in acc ordance with EN IS O 13849-1, two c hannels are required, that is, a
restart must be reliably prevented through two separate paths that are c ompletely independent of
each other. These two paths for interrupting the energy supply to the drive with the reliable impulse
block are c alled switch-off paths:
1st switch-off path:
Output stage enable via [X1] (blocking of the PWM signals; the IGBT drivers are no longer actuated with
pulse patterns).
2nd switch-off path:
Interruption of supply of the six output stage IGBTs via [X3] with the help of a relay (the IGBT opto-
coupler drivers are separated from the power supply through a relay, thus preventing the PWM signals
from reaching the I GBTs).
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