Profinet Device Start-Up Time, Naming, And Address Assignment - Siemens SIMATIC S7 System Manual

98BDevice configuration
5.6 Configuring the CPU for communication
In NTP mode, it is generally UTC (Universal Time Coordinated) that is transferred; this
corresponds to GMT (Greenwich Mean Time).
In the Properties window, select the "Time synchronization" configuration entry. STEP 7
displays the Time synchronization configuration dialog:
Note
All IP addresses are configured when you download the project.
Table 5- 10
Parameter
Enable time-of-day
synchronization using Network
Time Protocol (NTP) servers
Server 1
Server 2
Server 3
Server 4
Time synchronization interval
5.6.8

PROFINET device start-up time, naming, and address assignment

PROFINET IO can extend the start-up time for your system (configurable time-out figure).
More devices and slow devices impact the amount of time it takes to switch to RUN. There is
a maximum of 8 IO devices on the S7-1200 PROFINET network.
Each station (or IO device) starts up independently on start-up, and this affects the overall
CPU start-up time. If you set the configurable time-out too low, there may not be a sufficient
overall CPU start-up time for all stations to complete start-up. If this situation occurs, false
station errors will result.
The default configurable time-out is 1 minute; the user can configure this time.
132
Parameters for time synchronization
Definition
Click the checkbox to enable time-of-day synchronization using
NTP servers.
Assigned IP Address for network time server 1
Assigned IP Address for network time server 2
Assigned IP Address for network time server 3
Assigned IP Address for network time server 4
Interval value (sec)
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05