Connection resources
11.2 Allocation of connection resources
Communication
Function Manual, 12/2017, A5E03735815-AF
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Connection resources for HMI communication
With HMI communication, the occupation of connection resources in the station depends on
the HMI device being used.
Table 11- 2 Maximum occupied connection resources for different HMI devices
Maximum occupied connection resources of the
station per HMI connection
Comfort Panel 2
1
1
If you do not use system diagnostics or alarm configuration, the station occupies only one connec-
tion resource per HMI connection.
: You have configured the following HMI connections for a CPU 1516-3 PN/DP:
● Two HMI connections to an HMI TP700 Comfort. (2 connection resources each)
● One HMI connection to an HMI KTP1000 Basic. (1 connection resource)
In total 5 connection resources are occupied for HMI communication in the CPU.
Connection resources for routing
To transfer data beyond S7 subnets ("S7 routing"), an S7 connection is established between
two CPUs. The S7 subnets are connected via gateways known as S7 routers. CPUs, CMs
and CPs in S7-1500 are S7 routers.
The following applies for a routed S7 connection:
● A routed connection occupies one connection resource each in both end points. STEP 7
shows these connection resources in the "Connection resources" table.
● On the S7 router, two special connection resources are occupied for S7 routing. STEP 7
does not show the special connection resources for S7 routing in the "Connection
resources" table. The number of resources for S7 routing depends on the CPU. You will
find the resources for S7 routing in the technical specifications of the CPU in "Number of
S7 routing connections".
Connection resource for S7 communication
Special connection resources for S7 routing
Figure 11-3 Connection resources with S7 routing
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