Communications processors for SIMATIC S7
8.4 Communications processors for SIMATIC S7-400
Industrial Ethernet
324 System Manual, 09/2019, C79000-G8976-C242-10
● IP access protection on the RNA interface (IP-ACL)
Using IP access protection gives you the opportunity of restricting communication over
the CP of the local S7 station to partners with specific IP addresses.
● Web diagnostics on the RNA interface
With the aid of Web diagnostics, you can read out the diagnostics data from a station
connected via the CP to a PG/PC with a Web browser.
The Web pages contain the following information:
– Module and status information
● Diagnostics buffer extract request
With the aid of a Web browser, the CP supports the option of obtaining an extract of the
diagnostics buffer containing the most recent diagnostics events of the CPUs and CPs
located in the same S7 station as the CP.
● Connection diagnostics with the AG_CNTEX program block
With the AG_CNTEX program block, you can diagnose connections.
– When necessary, you can activate or deactivate connections or initiate
reestablishment of a connection.
– You can check the reachability of the connection partners using the PING function (on
the RNA interface).
– You can find out which connection types are set up on the RNA interface for the
SEND / RECEIVE function.
● S5/S7 addressing mode
The addressing mode can be configured for FETCH/WRITE access as the S7 or S5
addressing mode (S7 addressing mode only for data blocks / DBs).
● Detecting IP double addressing in the network on the RNA interface
To save you time-consuming troubleshooting in the network, the CP detects double
addressing in the network.
● Support in the fault-tolerant system (H system)
S7 communication is supported in the H system with the following protocols:
– Ethernet interface
ISO transport
– RNA interface
ISO transport and ISO-on-TCP (RFC1006)
CP 443-1 OPC UA
The CP 443-1 OPC UA is designed to connect a SIMATIC S7-400 system to Industrial
Ethernet networks via OPC UA mechanisms.
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