Characteristics Of S7 Communication - Siemens S7-1500 Operating Instructions Manual

Product overview, functions
2.5 Configuration limits and performance data
Restrictions for UDP
● Restrictions UDP broadcast / multicast)
To avoid overloading the CP due to high broadcast / multicast frame traffic, the receipt of
UDP broadcast / multicast on the CP is limited
● UDP frame buffering
Length of the frame buffer: At least 7360 bytes
Following a buffer overflow, newly arriving frames that are not fetched by the user
program are discarded.
2.5.3

Characteristics of S7 communication

S7 communication provides data transfer via the ISO Transport or ISO-on-TCP protocols.
Feature
Total number of freely usable S7 connections on
Industrial Ethernet
LAN interface - data field length generated by CP
per protocol data unit (PDU = protocol data unit)
Number of reserved OP connections
Number of reserved PG connections
Number of reserved connections for Web
Note
Maximum values for an S7-1500 station
Depending on the CPU you are using, there are limit values for the S7-1500 station. Note the
information in the relevant documentation.
18
Explanation / values
Max. 118
for sending: 480 bytes / PDU
•
for receiving: 480 bytes / PDU
•
4
4
2
Operating Instructions, 05/2017, C79000-G8976-C289-07
CP 1543-1