Siemens S7-300 Installation And Operating Manual page 342

Glossary
Safety program
Safety-related user program
Safety-related communication
Communication for the exchange of fail-safe data
Sensor
Sensors are used for accurate detection of digital and analog signals as well as routes,
positions, velocities, rotational speeds, masses, etc.
Sensor evaluation
There are two types of sensor evaluation:
● → 1oo1 evaluation – sensor signal is read in once
● → 1oo2 evaluation - sensor signal is read twice by the same module and compared within
● → 2oo3 evaluation - sensor signal is compared in S7 F Systems using F-block F_2oo3AI.
Single-channel I/O
Configuration variant of
undo → F I/O are redundant. The F-I/O is no longer available when in error state.
Single-channel switched I/O
Configuration variant of S7 FH Systems in → safety mode for enhancing availability. The → F-
CPU is redundant, → F-I/O is not redundant; the system changes to the partner F-CPU when
a fault is detected. The F-I/O may no longer be available when in error state.
Standard mode
F-I/O mode of operation which does not support → safety-oriented communication by means
of → safety message frames. Supports only standard communication.
S7-300 F-SMs (except F-AI 6 x 0/4 ... 20 mA HART) can be used in standard mode or →
safety mode.
Static parameters
Can only be set when the CPU is in STOP, and cannot be changed dynamically by the
active user program by calling SFCs (system function).
342
the module or, in S7 F Systems, using F-block F_1oo2AI.
S7 Distributed Safety/S7 F/FH Systems
in → safety mode. → F CPU
Installation and Operating Manual, 01/2010, A5E00085586-10
Fail-safe signal modules