Application and properties
1.3 Configuration limits and performance data
CP 1243-1 DNP3, CP 1243-1 IEC
12 Operating Instructions, 02/2014, C79000-G8976-C312-02
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From an engineering station (ES) on which STEP 7 is installed, you can use the online
functions of STEP 7 via the CP to access the S7-1200 CPU if the station is located in the
same IP subnet. The following online functions are available:
– Downloading project or program data from the STEP 7 project to the station
– Querying diagnostics data on the station
– Downloading firmware files to the CP
For a remote station located in a different IP subnet or that can be reached via the
Internet, these functions can only be used if the ES is connected to the station via a VPN
tunnel (for example via a SCALANCE S).
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As an SNMP agent, the CP supports data queries using SNMP (Simple Network
Management Protocol) in version V1.
For more detailed information, refer to section Communication types and SNMP
(Page 42).
Configuration limits and performance data
Number of CMs/CPs per station
In each S7-1200 station, up to three CMs/CPs can be plugged in and configured; this means
a maximum of three identical CP 1243-1 DNP3 or three identical CP 1243-1 IEC modules.
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TCP connections to masters (DNP3 or IEC)
The CP can establish connections to up to 4 masters. These can be single or redundant
masters.
In the case of 4 redundant masters, this would be 8 physical devices addressed using
different IP addresses.
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Online functions / TeleService
1 connection resource is reserved for online functions / TeleService.
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8 connection resources for S7 connections (PUT/GET)
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– 1 connection resource for PG connections
– 3 connection resources for OP connections
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