Siemens Simatic S7-1500R System Manual page 317

Glossary
IP address
The IP address is made up of four decimal numbers with a range of values from 0 through
255. The decimal numbers are separated by a dot (for example 192.162.0.0).
The IP address consists of the following:
● Address of the network
● Device address (PROFINET interface of the IO controllers/IO devices)
Isolated modules
In the case of isolated input/output modules, the reference potentials of the control and load
circuits are electrically isolated. Examples are optical isolators, relays or transformers.
Input/output circuits can be connected to common potential.
Load current supply
The load current supply supplies the electric input and output circuits of the module.
MAC address
Each port of a PROFINET interface (PROFINET device) is assigned a unique global device
identifier in the factory. This 6-byte long device identifier is the MAC address.
The MAC address is divided into:
● 3-byte manufacturer ID
● 3-byte device ID (consecutive number)
The MAC addresses are generally shown on the front of the device.
Example: 08-00-06-6B-80-C0
Non-isolated modules
In the case of non-isolated input and output modules, the reference potentials of the control
and load circuits are electrically connected.
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.
Operating states
Operating states describe the behavior of a single CPU at any given time.
The primary CPU of the S7-1500R/H redundant system has the operating states STOP,
STARTUP, RUN, RUN-Syncup and RUN-Redundant. The backup CPU has the operating
states STOP, SYNCUP and RUN-Redundant.
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S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA