Connecting Sensors/Actuators
7.1
Safety- -relevant input/output signals
7.1.1
Overview of the SGEs/SGAs and their structure
Description
The safety--related input and output signals (SGEs and SGAs) are the interface of
the internal Safety Integrated functionality to the process.
SGE signals (safety--related input signals) control the active monitoring by dese-
lecting or selecting the safety functions. This is realized, among other things,
depending on the status (switching status) of sensors and transmitters.
SGA signals (safety--related output signals) are feedback signals from safety func-
tions. They are, among other things, suitable for controlling actuators in a safety--
related fashion.
Processing I/O signals for the NC and drive through two channels
A two--channel structure is used to input/output and process safety--related input/
output signals (refer to Figure 7-1 "NCK and drive monitoring channel"). All of the
requests and feedback signals for safety--related functions should be entered or
retrieved through both monitoring channels (two--channel structure).
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
7
7-189