Only a Soft-Net module may be operated in the PC for the process communication.
Combinations with
Hard-Net communication cards are possible. The driver software for Hard-
Net communication cards are supplied with the SIMATIC NET CDs enclosed.
Hard-Net communication cards enable the parallel operation of up to 2 protocols, e.g. Ethernet
communication using the SIMATIC S7 Protocol Suite and SIMATIC S5-Ethernet. In this case,
a reduction of approx. 20% of the table values must be taken into account.
Example:
● 40 connections using the "SIMATIC S7 Protocol Suite" combination and 8 connections via
"SIMATIC S5 Ethernet".
4) Depending on the number of serial interfaces. Can be expanded using communication cards
with several serial interfaces, e.g. Digi-Board with 8/16 ports.
5) Communication takes place via the standard Ethernet port of the computer or corresponding
Siemens communications processors.
The maximum possible number of connections is limited by the available system resources
and their performance data, particularly CPU, RAM, Ethernet connection.
6) Note the maximum number of WinCC systems (see table).
7) CAMP = Common ASCII Message Protocol
"SIMATIC S7-1200, S7-1500 Channel" channel
Maximum number of WinCC systems per CPU:
CPU "S7-12xx" Number CPU "S7-15xx" Number
S7-12xx V2.2 1 S7-1511 15
S7-12xx V3 3 S7-1513 23
S7-12xx V4 4 S7-1515 29
- - S7-1516 36
Maximum number of tags in runtime
The maximum number of tags that are simultaneously being used in the connection must not
be exceeded permanently.
You can read off the number of tags used in runtime in the WinCC Channel Diagnosis under
"Plc Attributes (free/max)". If several HMI devices access a controller, this value applies to all
HMI devices together.
Performance Data
8.9 Process Communication
WinCC: General information and installation
220 System Manual, 02/2017, A5E40840020-AA
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