Glossary
Safety Engineering in SIMATIC S7
Glossary-10
System Manual, 04/2006, A5E00109529-05
Passivation
If an -> F-I/O detects a fault, it switches either the affected channel or all channels to a ->
safe state; that is, the channels of this F-I/O are passivated. The F-I/O reports the detected
fault to the -> CPU via the slave diagnostics.
For an F-I/O with inputs, if passivation occurs, the F-system provides fail-safe values for the -
> safety program instead of the process data pending at the fail-safe inputs.
For an I/O with outputs, if passivation occurs, the F-system transfers fail-safe values (0) to
the fail-safe outputs instead of the output values provided by the safety program.
PCS 7
PCS 7 is a process control system based on selected SIMATIC components that have been
optimized for use in a control system. In addition, there are functional enhancements to
ensure availability of control-system-specific system behavior and functions required in a
process and instrumentation control system from engineering to operation.
Process Safety Time
The process safety time is the time interval during which the process can be left on its own
without causing injury to operating personnel or damage to the environment.
Within the process safety time, any type of F-system process control is tolerated. That is,
during this time, the -> F-system can control its process incorrectly or it can even exercise no
control at all. The process safety time depends on the process type and must be determined
on a case-by-case basis.
PROFINET IO
Within the framework of PROFINET, PROFINET IO is a communication concept for the
implementation of modular, distributed applications.
PROFINET IO allows you to create automation solutions familiar from PROFIBUS.
PROFINET IO is implemented based on both the PROFINET standard for automation
devices and the
STEP 7 engineering tool.
This means that you have the same application view in
STEP 7, regardless of whether you
are configuring PROFINET or PROFIBUS devices. Programming your user program is
essentially the same for PROFINET IO and PROFIBUS DP if you use the expanded blocks
and system status lists for PROFINET IO.
PROFINET IO Controller
A PROFINET IO controller is a device that is addressed via the connected IO device. That is:
that the IO controller exchanges input and output signals with assigned field devices. The IO
controller is often the controller on which the automation program runs.
PROFINET IO Device
A PROFINET IO device is a decentralized field device that is assigned to one of the IO
controllers (e.g., remote IO, valve terminals, frequency converters, switches)
