Siemens PM-E F pm DC24V PROFIsafe Installation And Operating Manual page 218

Glossary
Sensor evaluation
There are two types of sensor evaluation:
-> 1oo1 evaluation – sensor signal is read once
-> 1oo2 evaluation – sensor signal is read in twice from the same F-module and compared
internally
Sensors
Sensors are used for accurate detection of digital and analog signals as well as routes,
positions, velocities, rotational speeds, masses, etc.
SIL
Safety Integrity Level -> safety class
Standard mode
Operating mode of the F-I/O which supports standard communication, but not -> safety-
related communication by means of -> safety message frames.
Fail-safe signal modules of the S7-300 can be operated in standard mode or in -> safety
mode. Fail-safe ET 200S modules are designed for operation in safety mode only.
Static parameters
Static parameters can only be set when the CPU is in STOP mode, and cannot be changed
while the user program is running by means of SFC (system function).
Terminal module
The ET 200S distributed I/O system is terminated with the terminal module. An ET 200S
cannot be operated without a terminal module.
Voltage bus (P1/P2)
Two internal buses (P1 and P2) supply the electronic modules with voltage. The voltage
buses are fed by the power module and are connected via terminal modules.
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ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07