Siemens Simatic ET200pro

Glossary
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 09/2016, A5E35873416-AA
139
NTP
The Network Time Protocol (NTP) is a standard for synchronizing clocks in automation
systems via Industrial Ethernet. NTP uses the UDP connectionless network protocol.
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
P
rotective
E
xtra
L
ow
V
oltage = grounded extra low voltage with safe isolation
Power module
The power module (PM) opens a new potential group for the load voltage supply 2L+.
Process image (I/O)
The CPU transfers the values from the input and output modules to this memory area. At the
start of the cyclic program, the CPU transfers the signal states of the input modules to the
process image input. At the end of the cyclic program, the CPU transfers the process image
output as a signal state to the output modules.