Glossary - Siemens SIMATIC S7 System Manual

Glossary

1oo1 evaluation
-> 1oo1 Evaluation
1oo1 Evaluation
1oo1 evaluation is a type of -> sensor evaluation in which one sensor is connected via one
channel to the ->F-I/O.
1oo2 evaluation
-> 1oo2 Evaluation
1oo2 Evaluation
1oo2 evaluation is a type of -> sensor evaluation in which two input channels are occupied,
either by one two-channel sensor or two single-channel sensors. The input signals are
compared internally for equivalence or non-equivalence.
Access Protection
-> Fail-safe systems must be protected from dangerous, unauthorized access. Access
protection for -> F-systems is implemented through assignment of two passwords
(for the -> F-CPU and the -> safety program).
Actuators
Actuators can be power relays or contactors for switching on loads, or they can be loads
themselves (for example, directly controlled solenoid valves).
Automatically Generated F-Blocks
S7 Distributed Safety: These -> F-blocks are generated automatically when the -> safety
program is compiled and are called, if necessary, to generate an executable safety program
from the user's safety program.
Availability
Availability is the probability that a system is functional at a specific point in time. Availability
can be increased through -> redundancy (for example, by using redundant F-I/O and/or by
using multiple -> sensors at the same measuring point).
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
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