CP 443-5 Extended
Equipment Manual, 01/2023, C79000-G8976-C162-10
9
Application and functions
1.1 Application
Automation system
The CP 4435 Extended communications processor is designed for use in a SIMATIC S7400
(standard) and S7400H (faulttolerant system) automation system. The CP 443-5 Extended
allows the S7400 / S7400H to be connected to a PROFIBUS fieldbus system.
You can use the CP as a router for data records intended for field devices (for example DP
slaves).
1.2 Functions and communication services
Supported communications services
The current version of the CP 4435 Extended supports the following communication services
in the standard and H systems:
• PROFIBUS DP with the following characteristics:
– DP master (class 1) (redundant operation in faulttolerant system also possible)
– Direct data exchange (DP slave to DP slave)
As a DP master, the CP 4435 Extended is capable of enabling direct data exchange for
"its" DP slaves.
– SYNC / FREEZE
The outputs or inputs can be synchronized by the user program using system function
SFC11.
(Refer to the information in Table 1-1 Use with the current CPU types (Page 13) and
Table 1-2 Use with no longer available CPU types - part 1 (Page 14))
– Constant bus cycle time (only in the standard system)
The ability to set a constant bus cycle time means that the DP master always starts the
DP bus cycle after the same interval.
– Selectable DP modes:
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