User Manual
Appendix A
GFK-2843A
Jan 2020
VersaSafe system
89
A-10
Achievable safety depending on the modules
used
Important
Emerson recommends using the SISTEMA software utility to determine the achievable
safety.
The SISTEMA software utility for the safety of control systems on machines can be
downloaded free of charge from the website for the Institute for Occupational Safety and
Health of the German Social Accident Insurance, see
http://www.dguv.de/ifa/en/pra/softwa/sistema/index.jsp.
This Windows tool provides assistance in evaluating the safety of control systems within
the scope of EN ISO 13849-1.
According to SISTEMA, performance level PL e can be achieved with the maximum con-
figuration of 5 serial chains (6 x IC220SDL963 plus the relevant satellites). However, you
should always check your actual application to ascertain the level of safety that can be
achieved.
A-11
Behavior in the event of an error
Error messages
Errors that occur on the safe devices can be detected using
process data, functional blocks, device LEDs.
These error messages can be evaluated in the standard
application program or can be displayed by means of a
visualization.
Important
For instructions on how to proceed in the event of an error, please
refer to Section "Acknowledging an error" on page 55.
Service
information
In addition to error messages, service information can also be
output. This information takes the form of device message
warnings that do not affect the safety function. These warnings
are either unacknowledged messages or messages that are
acknowledged via the controller.
Error classes
The response of all devices connected to the system and the
safety functions to an error depends on the error class detected.
There are five different error classes in the VersaSafe system:
–
Critical system and device errors
–
Parameterization and configuration errors
–
Communication errors
–
I/O errors
