Siemens SIMATIC S7 F Manual page 347

1oo1 evaluation
Fault tolerance time (i. e.
process safety time)
F-capable CPU
I
I&C
Internal fault
L
Light period
M
Module fault
Module redundancy
O
OS
P
Passivation
PROFIsafe
Proof test interval
Fail-Safe Systems
A5E00085588-03
Type of sensor evaluation: In 1oo1 evaluation, there is one sensor and it
is connected to the module via a single channel.
The time in which the effectiveness of the safety equipment can be
impaired without producing a hazard.
The fault tolerance times are determined by the relevant process
functions.
CPU permitted for use in the S7 F/FH
Instrumentation and control
-> Module error
Light periods occur during complete bit pattern tests. This involves test-
related 1 signals being switched to the output by the fail-safe output
module while the output is inactive (output signal "0"). The output is then
switched on briefly (light period). A sufficiently slow actuator will not
respond to this and remains switched off.
Module-wide fault – Module faults can be external faults (e. g. no load
voltage) or internal faults (e.g. processor failure). An internal error always
requires module replacement.
An additional, identical module is operated redundantly to increase
availability.
Operator station
Passivation of digital output channels means that the outputs are
deenergized.
Passivation of digital input channels occurs when the inputs transfer the
value "0" to the CPU (via the fail-safe drivers), irrespective of the current
process signal.
Passivation of analog input channels occurs when the inputs transfer a
substitute value or the last valid value to the CPU (via the fail-safe
drivers), irrespective of the current process signal.
Safety-related bus profile of PROFIBUS DP/PA for communication
between the fail-safe user program and the fail-safe signal modules in S7
F/FH Systems.
The period of time after which a component must be put into an error-free
state (i.e. replaced by an unused component or demonstrated to be
completely error-free).
Glossary
Glossary-3