Siemens SIMATIC ET 200pro Operating Instructions Manual page 149

Glossary
OPC UA
OPC UA (OPC Unified Architecture) is a collection of standards for industrial
communications. These standards describe a service-oriented architecture:
● Transport of data between machines
● Interfaces and semantics of data, for example, information about the data such as data
type and object type.
OPC UA is particularly suitable for cross-level data exchange:
● Operating system independence
● Manufacturer-independent
● Integrated security
Operating states
Operating states describe the behavior of a single CPU at a specific time.
Organization block
Organization blocks (OBs) form the interface between the operating system of the CPU and
the user program. The organization blocks determine the order in which the user program is
executed.
Parameter
● Tag of a STEP 7 code block:
● Tag for setting the behavior of a module (one or more per module). In as-delivered state,
every module has an appropriate basic setting, which you can change by configuring in
STEP 7. There are static and dynamic parameters
Parameter assignment
Parameter assignment is the transfer of parameters from the IO controller to the IO device.
Parameters, dynamic
In contrast to static parameters, you can change dynamic parameters of modules during
operation by calling an SFC in the user program, e.g. limit values of an analog input module.
Parameters, static
In contrast to dynamic parameters, you cannot change static parameters of modules with the
user program but only by configuring in STEP 7, e.g. input delay of a digital input module.
PELV
Protective Extra Low Voltage = grounded extra low voltage with safe isolation
148
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 11/2019, A5E35873416-AC