Siemens SIMATIC S7-1500 System Manual page 261

Interrupt, update
When it receives an update interrupt, the operating system calls the update interrupt OB.
This may happen if you changed a parameter on a slot of a device.
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 (e.g. 192.162.0.0).
The IP address consists of the following:
● Address of the network
● Address of the device (PROFINET interface of the IO controller/IO device)
Is olated m odules
In the case of isolated input/output modules, the reference potentials of the control and load
circuits are galvanically isolated, e.g. by means of optical isolators, relays or transformers.
Input/output circuits can be connected to common potential.
Load current s upply
Supply of the module's input and output electric circuits.
M AC address
Every PROFINET device is assigned a worldwide unique device identification before it
leaves the factory. This 6-byte long device identification is the MAC address.
The MAC address is divided into:
● 3-byte manufacturer identification
● 3-byte device identification (consecutive number)
The MAC address is generally shown on the front of the device.
Example: 08-00-06-6B-80-C0
Non-isolated m odules
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.
Automation system
System Manual, 09/2016, A5E03461182-AD
Glossary
261