Safety functions in the drive
Safety functions ("Safety Integrated Basic Functions") in the SINAMICS drive are
safety-oriented, internal drive functions with the goal of shutting down the respective drive
safely. In addition, additional safety functions are available to monitor definable limits
("Safety Integrated Extended Functions"). The goal of these safety functions is to monitor
that the respective limit is maintained, to signal the violation or to subsequently shut down
the drive safely. To prevent the monitoring function from being triggered, it is necessary to
switch the axis to the monitored operating mode with the user program or to keep it in
this mode.
The cooperation of the safety functions in the drive and the SIMATIC S7-1500 and
S7-1500T are necessary to ensure fault-free plant operation.
The technology objects speed axis, positioning axis and synchronous axis support the
"Safety Integrated Basic Functions" of the drive. The technology object detects that the
Basic Safety function is triggered and displays a corresponding warning (technology alarm
550 - alarm response: Track setpoints) or alarm (technology alarm 421 - alarm response:
Remove enable).
No additional response must take place in the user program, especially for technology
alarm 550, at the "Enable" input of the Motion Control instruction "MC_Power" in the sense
of a "shutdown". Shutdown of the Motion Control instruction "MC_Power" by the user after
technology alarm 421 is possible but not necessary.
After acknowledgment and release of the drive by the actual safety function, the technology
alarm can also be acknowledged at the respective technology object with the Motion Control
instruction "MC_Reset". The technology object is then enabled automatically,
if "MC_Power.Enable" is still "TRUE".
The "Safety Integrated Extended Functions" are not supported by the technology
object independently.
To prevent the extended safety functions from being triggered and thus preventing a
disruption in plant operation, we recommend that you evaluate the status of the safety
functions. This evaluation can take place in the user program by using or evaluating the
status information of the "Safety Info Channels" (SIC). With the help of the corresponding
Motion Control instruction, the axis can now stay within the monitored limit or reach it before
a deviation is detected.
