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11
Glossary
1oo1 Evaluation
1oo2 Evaluation
A
Acknowledgment
Time
Actuator
Availability
C
Category
Channel Fault
ET 200eco Distributed I/O Station Fail-Safe I/O Module
A5E00297494-02
1oo1 evaluation is a type of sensor evaluation in which one -> sensor is
connected to the fail-safe I/O module by means of a single channel.
-> Sensor evaluation method - In 1oo2 evaluation, two input channels
are occupied, either by one 2-channel sensor or two single-channel
sensors. The input signals are compared internally for equality
(equivalence) or non-equality (nonequivalence).
During the acknowledgement time, the -> F-I/O acknowledge the sign of
life specified by the -> F-CPU. The acknowledgement time enters into
the calculation of the -> monitoring time and -> response time for the
F-system as a whole.
Actuators can be power relays or contactors for switching on consumers,
or they can be consumers themselves (for example, directly controlled
solenoid valves).
Availability is the probability that a system is functional at a specific point
in time. Availability can be increased by redundancy, e.g., by using
redundant signal modules and/or by using multiple -> sensors at the
same measuring point.
Category in accordance with EN 954-01:
With -> fail-safe I/O modules, up to category 4 can be achieved in safety
mode.
A channel fault is a channel-related fault, such as a wire break or a short
circuit.
11-1
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