Siemens Simatic CFU Commissioning Manual page 156

Glossary
Connection plug
Physical connection between device and cable.
Crimping
Procedure in which two components, e.g. wire end ferrule and cable, are connected with each
other by plastic strain.
Dark period
Dark periods occur during shutdown tests and complete bit pattern tests. The fail-safe output
module switches test-related zero signals to the active output. This output is then briefly
disabled (= dark period). An adequate carrier → actuator will not respond to this and will remain
activated.
Derating
See temperature characteristics
Device name
Before an IO device can be addressed by an IO controller, it must have a device name.
An IO device is delivered without a device name. An IO device can only be addressed by the
IO controller after it has been assigned a device name via the PG/PC or via the topology, e.g.
for the transfer of configuration data (such as IP address) during startup or for the exchange
of user data during cyclic operation.
Diagnostics
Monitoring functions for the recognition, localization, classification, display and further
evaluation of errors, faults and alarms. They run automatically during plant operation. This
increases the availability of plants because commissioning times and downtimes are reduced.
Distributed I/O devices - field of use
Distributed I/O system
System with input and output modules that are configured on a distributed basis, far away from
the CPU controlling them.
DP
Distributed I/O system
→
Earth
Conductive earth whose electrical potential can be set equal to zero at any point.
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Commissioning Manual, 07/2018, A5E39252870-AC
SIMATIC CFU