Siemens S7-1200 Operating Instructions Manual page 18

Application and properties
1.4 Performance data and configuration limits
Number of simultaneous TeleService connections
● Max. 1 TeleService connection
Number of simultaneous connections for S7 communication and Open User Communication
A maximum total of 14 connection resources for S7 communication and Open User
Communication
The maximum number can be divided up as required into:
● S7 connections (PUT/GET)
● TCP connections
● ISO-on-TCP connections
● UDP connections
Number of connections to NTP servers
● Max. 1 connection to an NTP server
User data
With the connection types listed below, the user data of a frame represent a consistent data
area in terms of the time of transfer.
User data per frame with the various connection types:
● For TCP connections: Max. 8192 bytes
● For ISO-on-TCP connections: Max. 1452 bytes
● For UDP connections: Max. 1472 bytes
With frames of telecontrol communication, the individual values of the data points are time
stamped.
Number of PLC tags for data point configuration
The maximum number of PLC tags that can be used for data point configuration is 100.
Frame memory (send buffer)
The CP has a frame memory (send buffer) for data points configured as an event.
The send buffer has a maximum size of 64 000 events divided into equal parts for all
configured communications partners. The size of the frame memory can be set in STEP 7.
See also section Process image, type of transmission, event classes, triggers (Page 51).
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Operating Instructions, 01/2015, C79000-G8976-C381-01
CP 1243-7 LTE