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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 ports 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 acknowledgment
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 circuit is not carried out by the motor controller. The
inputs have no tolerance against test pulses (OSSD).
Inter-
face
Port Description
Pin Designation
[X1] 6 GND24 Reference potential for digital inputs and outputs
9 DIN 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 0 V 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 accordance with EN ISO 13849-1, two channels are required, that is, a
restart must be reliably prevented through two separate paths that are completely independent of
each other. These two paths for interrupting the energy supply to the drive with the reliable impulse
block are called 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 IGBTs).