Functions Supported by the Interfaces
Table 1-1 Functions of the CP 440
Function CP 440
RS 422* RS 485*
3964(R) Procedure Yes No
ASCII driver: Yes Yes
• XON/XOFF ow control
Yes No
* The RS 422 and RS 485 are distinguished by their parameter conguration.
1.2 Components Required for a Point-to-Point Connection with the CP
440
1.2.1 Required Hardware Components
Hardware Components
The following table lists the hardware components required for establishing a point-to-point
connection with the CP 440.
Table 1-2 Hardware Components for a Point-to-Point Connection with the CP 440
Components Function Diagram
Rack ... provides the mechanical and electrical
connections of the S7-400.
Power supply module (PS) ... converts the line voltage (120/230 V AC
or 24 V DC) into the operating voltage of 24
V and 5 V DC required to supply the S7-400.
Central processor unit (CPU)
Some CPU versions cannot be used with
the CP 440.
Accessories: Memory card, backup battery
... executes the user program; communi‐
cates via the MPI interface with other CPUs
or with a programming device.
CP 440 communication processor ... communicates via the interface with one
or more communication partners.
Standard cable ... connects the CP 440 communication
processor to the communication partner.
Programming device cable ... connects a CPU to a programming device/
PC.
Programming device or PC ... communicates with the CPU of the
S7-400.
Product Description
1.2 Components Required for a Point-to-Point Connection with the CP 440
Point-to-point connection CP 440 Installation and Parameter Assignment
12 Equipment Manual, 03/2022, A5E00057742-AE
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