Siemens S7-1200 - PROFINET Device Start-Up Time, Naming, and Address Assignment

Device configuration
5.7 Configuring the CPU for communication
S7-1200 Programmable controller
166 System Manual, 03/2014, A5E02486680-AG
Note
All IP addresses are configured when you download the project.
Table 5- 10 Parameters for time synchronization
Parameter
Definition
Enable time-of-day
synchronization using Network
Time Protocol (NTP) servers
Click the checkbox to enable time-of-day synchronization using
NTP servers.
Server 1
Assigned IP Address for network time server 1
Server 2
Assigned IP Address for network time server 2
Server 3
Assigned IP Address for network time server 3
Server 4
Assigned IP Address for network time server 4
Time synchronization interval Interval value (sec)
5.7.8
PROFINET device start-up time, naming, and address assignment
PROFINET IO can extend the start-up time for your system (configurable time-out). More
devices and slow devices impact the amount of time it takes to switch to RUN.
In V4.0, you can have a maximum of 16 PROFINET IO devices on your 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.
In the CPU Properties under "Startup", you can find the "Parameter assignment time for
distributed I/O" (time-out). The default configurable time-out is 60,000 ms (1 minute); the
user can configure this time.
PROFINET device naming and addressing in STEP 7
All PROFINET devices
must
have a Device Name and an IP Address. Use STEP 7 to define
the Device Names and to configure the IP addresses. Device names are downloaded to the
IO devices using PROFINET DCP (Discovery and Configuration Protocol).