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Glossary
S
Sampling time
Interval between two consecutive scans of a block in a temporally equidistant processing class (watchdog interrupt OB). It is defined by the
ES on the basis of the configured runtime group.
Standard (block,
display block
Generic term for all objects in standard libraries which are supplied by
Siemens.
Startup
From the point of view of the CPU the transition between the operating
status STOP (internal STOP, i.e. CPU is ready) and operating status
RUN (with processing of the user programs). The following types of
startups can be differentiated on the basis of the organization blocks
(CPU specific):
Cold restart, in which the results and states at interrupts are not taken
into consideration (OB100).
Restart, in which the results and states of the user program at the interrupt are considered (not relevant for this library).
Start-up
characteristics
Transition of a block into a defined state after it has been processed in
a start-up OB. In this library only a cold restart is relevant (OB100).
T
Tracking
Status, which can be activated, of a block during which a (tracked) parameter is overwritten by its own program with the value of another parameter (tracking value). This means that a value defined by the user
can be forced upon a parameter which is usually determined by a process or program.
U
User (block,
display block)
Library of Driver Blocks
C79000-G8076-C711-04
Generic term for all the objects supplied by the user (customer, engineering office, department planning a project for a customer) in userspecific libraries.
Glossary-7