Safety Functions; Safe Operating Stop (Sos) - Siemens Simatic ET 200SP Equipment Manual

Parameters/address space

4.9 Safety functions

4.9 Safety functions
This provides a quick overview of the principle mode of operation of the F-TM Count module
safety functions.
The description of the safety functions is based on the definition according to standard
EN 61800-5-2 and some simple examples for using the function.
The description of the functions is simplified, as far as possible, to clearly show essential
properties and configuration options.
4.9.1

Safe Operating Stop (SOS)

SOS monitoring
SOS monitoring is initiated whenever the "Enable Safe Stop" bit is set in the control interface
and subsequently processed by the F-TM Count module. SOS monitoring terminates
whenever the "Enable Safe Stop" bit is reset in the process output image and subsequently
processed by the module.
Each time SOS monitoring is initiated, the current position is stored. A "Safe Stop Event" is set
whenever any movement is detected in either direction that exceeds the configured
"Standstill tolerance" as measured from the stored position.
Standstill tolerance is configured in counts.
Once set, the "Safe Stop Event" bit remains set and counting continues after the event is
triggered. The "Safe Stop Event" remains set until the "Reset Safe Stop" bit is set to 1, until a
power cycle, or until a new parameterization is loaded.
Configuring a value of 0 for the standstill tolerance results in the "Safe Stop Event" being set
immediately after the first pulse in either direction.
Safe stop monitoring continues when counting is suspended and SOS monitoring is
enabled.
Since there is no active counting operation, this safety function becomes ineffective. This
can result in unexpected machine or process operation, which can cause death, severe
personal injury, and/or property damage.
You must ensure steps outlined in safety standards applicable to your system are followed
before the event bit is reset.
50
WARNING
ET 200SP F-TM Count 1x1Vpp sin/cos HF (6ES7136-6CB00-0CA0)
Equipment Manual, V1.0, 01/2021, A5E47073911-AA