Glossary - Siemens SIMATIC ET 200SP Product Information

Glossary

1oo1 evaluation
Type of → sensor evaluation – in the case of the 1oo1 evaluation, there → is one sensor with
a 1-channel connection to the F module.
1oo2 evaluation
Type of → sensor evaluation – in the case of 1oo2 evaluation , two input channels are
assigned one two-channel sensor or two one-channel sensors. The input signals are
compared internally for equivalence or nonequivalence.
Acknowledgment time
During the acknowledgment time, the → F-I/O acknowledge the sign of life specified by the →
F-CPU. The acknowledgment time is included in the calculation of the → monitoring time and
→ response time of the overall fail-safe system.
Actuator
Actuators can be power relays or contactors for switching on loads, or they can be loads
themselves (e.g., directly controlled solenoid valves).
Availability
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 multiple -> sensors at the s ame measuring
point.
Channel fault
Channel-specific fault, such as a wire break or short circuit.
In channel-specific passivation, the affected channel is either automatically reintegrated or
the fail-safe module must be removed and reinserted after the fault has been eliminated.
Channel group
The channels of a module are grouped together in a channel group. Certain parameters in
STEP 7 can only be assigned to channel groups, rather than to individual channels.
Channel number
Channel numbers are used to uniquely identify the inputs and outputs of a module and to
assign channel-specific diagnostic messages.
ET 200SP distributed I/O system
Product Information, 07/2013, A5E32288220-AA
31