Siemens SIMATIC CP 440 User manual

Preface, Contents
Product Description 1
Basic Principles of Serial Data
Transmission 2
Commissioning the CP 440 3
Installing the CP 440 4
Configuring and
Parameterizing the CP 440 5
Communication Using Function
Blocks 6
Start-up Characteristics and
Operating Mode Transitions of
the CP 440 7
Diagnostics with the CP 440 8
Programming Example –
Standard Blocks 9
Appendices
Technical Specifications A
Connecting Cables B
Communication Matrix of the
Protocols C
Accessories and Order
Numbers D
Reference for SIMATIC S7 E
Index
Point-to-point Communication
CP 440
Installation and Parameter
Assignment
Manual
02/2000
A5E00057742
Edition 02
SIMATIC

Index-2 Point-to-pointconnection CP 341Installation and Parameter Assignment
C79000-G7000-C341-02
!Danger
indicates that death, severe personal injury or substantial property damage will result if proper precau-
tions are not taken.
!Warning
indicates that death, severe personal injury or substantial property damage can result if proper precau-
tions are not taken.
!Caution
indicates that minor personal injury or property damage can result if proper precautions are not taken.
Note
draws your attention to particularly important information on the product, handling the product, or to a
particular part of the documentation.
Qualified Personnel
Only qualified personnel should be allowed to install and work on this equipment. Qualified persons are
defined as persons who are authorized to commission, to ground, and to tag circuits, equipment, and sys-
tems in accordance with established safety practices and standards.
Correct Usage
Note the following:
!Warning
This device and its components may only be used for the applications described in the catalog or the
technical descriptions, and only in connection with devices or components from other manufacturers
which have been approved or recommended by Siemens.
This product can only function correctly and safely if it is transported, stored, set up, and installed cor-
rectly, and operated and maintained as recommended.
Trademarks SIMATIC, SIMATIC HMIand SIMATIC NETare registered trademarks of SIEMENS AG.
Some of other designations used in these documents are also registered trademarks; the owner’s rights
may be violated if they are used by third parties for their own purposes.
Safety Guidelines
This manual contains notices which you should observe to ensure your own personal safety, as well as to
protect the product and connected equipment. These notices are highlighted in the manual by a warning
triangle and are marked as follows according to the level of danger:
We have checked the contents of this manual for agreement with the
hardwareand software described. Since deviations cannot be pre-
cluded entirely, we cannot guarantee full agreement. However, the
data in this manual are reviewed regularly and any necessary cor-
rections included in subsequent editions. Suggestions for improve-
ment are welcomed.
Disclaimer of LiabilityCopyright {Siemens AG 2000 All rights reserved
The reproduction, transmission or use of this document or its
contents is not permitted without express written authority.
Offenders will be liable for damages. All rights, including rights
createdby patent grant or registration of a utility model or design, are
reserved.
SiemensAG
Bereich Automatisierungs- und Antriebstechnik
Geschaeftsgebiet Industrie-Automatisierungssysteme
Postfach 4848, D- 90327 Nuernberg SiemensAG 2000
Technical data subject to change.
Siemens Aktiengesellschaft A5E00057742

iii
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Preface
Purpose
This manual explains how to establish and operate a point-to-point connection.
Contents of This Manual
The manual describes the hardware and software of the CP 440 communication
processor and its integration in an S7-400 programmable controller. It is divided up
into instruction-based chapters and a reference section (appendices).
The following subjects are covered:
•The basics of point-to-point communication with the CP 440
•Starting up the CP 440
•Installing the CP 440
•Communication with the CP 440
•Troubleshooting
•Application examples
•Properties and technical specifications
Scope of This Manual
This manual is valid for the following:
Product Order Number As of Version
CP 440 with the
X27 RS 422/485 interface 6ES7 440-1CS00-0YE0 01
Note
The description of the CP 440 communication processor in this manual were
correct at the time of publication. We reserve the right to describe modifications to
the functionality of the modules in a separate Product Information.

Preface
iv Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Structure of This Manual
To help you to quickly find the information you require, this manual offers the
following:
•You will find a full table of contents at the beginning of the manual.
•Finally, a comprehensive index allows quick access to information on specific
subjects.

Preface
v
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Other Manuals Required
Appendix E contains a list of the other manuals on the subject of the S7-400 that
you will require in order to put your system into operation.
Electronic Manuals
The entire set of SIMATIC S7 documentation is available on CD-ROM.
Standards, Certificates and Approvals
The CP 440 communication processor meets the requirements and criteria of
IEC 1131, Part 2 and the requirements for CE marking. The CP 440 has CSA
certification, UL recognition and FM approval.
Recycling and Disposal
The CP 440 is an environment-friendly product. It is exceptional for the following:
•Housing plastic with halogen-free flame protection and is highly resistant to fire
•Laser inscriptions (i.e. no labels)
•Plastics identification in accordance with DIN 54840
•Fewer materials used due to size reduction; fewer parts due to integration in
ASICs
The CP 440 is suitable for recycling on account of the low level of contaminants in
its components.
For further information about environment-friendly recycling and the procedure for
disposing of your old equipment, please contact:
Siemens Aktiengesellschaft
Anlagenbau und Technische Dienstleistungen
ATD TD 3 Kreislaufwirtschaft
Postfach 32 40
D-91050 Erlangen, Germany
Phone: + 49 91 31/7-3 36 98
Fax: + 49 91 31/7-2 66 43
The people there will adapt their advice to suit your situation and provide a
comprehensive and flexible recycling and disposal system at a fixed price. After
disposal you will receive information giving you a breakdown of the relevant
material fractions and the associated documents as evidence of the materials
involved.

Preface
vi Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Additional Assistance
Please contact your local Siemens representative if you have any queries about
the products described in this manual. A list of Siemens representatives worldwide
is contained, for example, in the “Siemens Worldwide” Appendix of the manual
S7-400 Programmable Controller, Hardware and Installation .
If you have any questions or suggestions concerning this manual, please fill out the
form at the back and return it to the specified address. Please feel free to enter
your personal assessment of the manual in the form provided.
We offer a range of courses to help get you started with the SIMATIC S7
programmable controller. Please contact your local training center or the central
training center in Nuremberg, D-90027 Germany (tel. [phone]).
Constantly Updated Information
You can obtain constantly updated information on the SIMATIC products on the
Internet at http://www.ad.siemens.de
In addition, SIMATIC Customer Support provides you with up-to-date information
and downloads that can be useful to you when using SIMATIC products:
•On the Internet at http://www.ad.siemens.de/simatic-cs
•Via the SIMATIC Customer Support Mailbox (German) at 49 [phone]
or the SIMATIC Customer Support BBS (English).
The mailbox is best accessed with a modem up to V.34 (28.8 kbps) parameterized
as follows: 8, N, 1, ANSI, or via ISDN (x.75, 64 kbits).
You can contact SIMATIC Customer Support by phone at 49 [phone] or
by fax at 49 [phone]. You can send questions by e-mail on the Internet or
to the above-mentioned mailbox.

vii
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Contents
1 Product Description 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Applications of the CP 440 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Components Required for a Point-to-Point Connection with the CP 440 1-3.
1.3 Design of the CP 440 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 Features of the X27 (RS 422/485) Interface 1-8. . . . . . . . . . . . . . . . . . . . . . . . .
1.4.1 Cables for Connecting the CP 440 to a Communication Partner 1-8. . . . . . . .
2 Basic Principles of Serial Data Transmission 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Serial Transmission of a Character 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Transmission Procedure with a Point-to-Point Connection 2-6. . . . . . . . . . . . .
2.2.1 ISO 7-Layer Reference Model for Data Transmission 2-6. . . . . . . . . . . . . . . . .
2.2.2 Data Transmission with the ASCII Driver 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.3 Data Transmission with the 3964(R) Procedure 2-24. . . . . . . . . . . . . . . . . . . . . .
3 Commissioning the CP 440 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Sequence of Steps to Be Taken 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Commissioning the Physical Interface 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Installing the CP 440 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 CP 440 Slots 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Installing and Removing the CP 440 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Installation Guidelines 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Configuring and Parameterizing the CP 440 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Configuring the CP 440 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Parameterizing the Communication Protocols 5-3. . . . . . . . . . . . . . . . . . . . . . .
5.3 Parameterization Data 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.1 Basic Parameters of the CP 440 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.2 Parameterization Data of the ASCII Driver 5-6. . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.3 Parameterization Data of the 3964(R) Procedure 5-14. . . . . . . . . . . . . . . . . . . .
5.4 Management of the Parameter Data 5-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5 Uploading Firmware Updates 5-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
viii Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
6 Communication Using Function Blocks 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Communication Using Function Blocks 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Overview of the Function Blocks 6-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 Notes on Program Structure 6-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4 Using the Function Blocks 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.1 The S7 Transmits Data to a Communication Partner,
10 SEND_440 FB 6-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.2 S7 Receives Data from a Communication Partner, 9 RECV_440 FB 6-10. . . .
6.4.3 Deleting the Receive Buffer (11 “RES_RECV” FB) 6-14. . . . . . . . . . . . . . . . . . .
6.5 Programming the Function Blocks 6-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.5.1 General Information on Data Block Assignment 6-18. . . . . . . . . . . . . . . . . . . . .
6.5.2 Supplying the Block Parameters 6-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6 General Information on Program Processing 6-23. . . . . . . . . . . . . . . . . . . . . . . .
6.7 Technical Specifications of the Function Blocks 6-24. . . . . . . . . . . . . . . . . . . . . .
7 Startup Characteristics and Operating Mode Transitions of the CP 440 7-1. . . . .
7.1 Operating Modes of the CP 440 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 Startup Characteristics of the CP 440 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3 Behavior of the CP 440 During Operating Mode Transitions of the CPU 7-3.
7.4 Behavior of the Sender Line Drivers of the Serial Interface
During Particular Operating Modes of the CP 440 7-4. . . . . . . . . . . . . . . . . . . .
8 Diagnostics with the CP 440 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 Diagnostic functions of the CP 440 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 Diagnosis via the Display Elements of the CP 440 8-3. . . . . . . . . . . . . . . . . . .
8.3 Diagnostic Messages of the Function Blocks 8-5. . . . . . . . . . . . . . . . . . . . . . . .
8.4 Diagnostics Using the Diagnostic Buffer of the CP 440 8-14. . . . . . . . . . . . . . .
9 Programming Example – Standard Blocks 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1 General 9-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.2 Device Configuration 9-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.3 Settings 9-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4 Blocks Used 9-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.5 Installation, Error Messages 9-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.6 Activation, Startup Program and Cyclic Program 9-8. . . . . . . . . . . . . . . . . . . . .
9.6.1 “CP440 SEND RECV” Program Example 9-8. . . . . . . . . . . . . . . . . . . . . . . . . . .
9.6.2 “CP440 1 CYC” Program Example 9-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.6.3 “CP440 ASCII BCC” Program Example 9-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.6.4 “CP440 MASTER” Program Example 9-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.6.5 “CP440 SLAVE” Program Example 9-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
ix
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
A Technical Specifications A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1 Technical Specifications of the CP 440 A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.2 Transmission Times A-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B Connecting Cables B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.1 X27 (RS 422/485) Interface of the CP 440 B-2. . . . . . . . . . . . . . . . . . . . . . . . . .
C Communication Matrix of the Protocols C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D Accessories and Order Numbers D-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E Reference for SIMATIC S7 E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index Index-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
xPoint-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02

1-1
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Product Description
In Section You Will Find on Page
1.1 Applications of the CP 440 1-2
1.2 Components Required for a Point-to-Point Connection with the
CP 440 1-3
1.3 Design of the CP 440 1-6
1.4 Properties of the X27 (RS 422/485) Interface 1-8
1

Product Description
1-2 Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
1.1 Applications of the CP 440
The CP 440 communication processor enables you to exchange data between
programmable controllers or computers by means of a point-to-point connection.
The CP 440 is designed to transfer short, fast frames.
The following are typically connected to it:
•Scanners, barcode readers
•Sensors
•Weighing scales
Functionality of the CP 440
The CP 440 communication processor provides the following functionality:
•An integrated MPI (Multipoint) X27 (RS422/485) interface
•A maximum transmission length of 200 bytes
•A transmission rate of up to 115.2 kbps, full-duplex
•Integration of the most important transmission protocols in the module firmware
– ASCII driver
– 3964(R) procedure
•Customization of the transmission protocols by means of parameter assignment
with the CP 440: Point-to-Point Communication, Parameter Assignment
parameterization interface.
Applications of the CP 440
The CP 440 communication processor allows point-to-point communication with
SIMATIC modules and with non-Siemens products. The SIMATIC modules that
can be connected are listed in Appendix C.
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 flow control Yes No
* The RS 422 and RS 485 are distinguished by means of parameterization.

Product Description
1-3
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
1.2 Components Required for a Point-to-Point Connection with the
CP 440
To establish a point-to-point connection between the CP 440 communication
processor and a communication partner, you require certain hardware and
software 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 VAC or 24 VDC) into
the operating voltage of 24 V and
5 VDC required to supply the
S7-400.
CPU
The CPUs with which the CP 440
cannot be used are listed in
Tables 1-5 and 1-4.
Accessories: Memory card
Backup battery
... executes the user program;
communicates 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 connecting cable ... connects the CP 440
communication processor to the
communication partner.

Product Description
1-4 Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Table 1-2 Hardware Components for a Point-to-Point Connection with the CP 440, continued
Components DiagramFunction
Programming device cable ... connects a CPU to a
programming device/PC.
Programming device or PC ... communicates with the CPU of
the S7-400.
Software Components
The following table lists the software components required for establishing a
point-to-point connection with the CP 440.
Table 1-3 Software Components for a Point-to-Point Connection with the CP 440
Components Function Diagram
STEP 7 software package,
as of version 4.0.2 ... configures, parameterizes, programs and tests the S7-400. +License
CP 440: Point-to-Point
Communication, Parameter
Assignment Parameterization
interface, Version 5.1
... parameterizes the interfaces of
the CP 440.
Function blocks (FBs) with
programming examples ... control communication between the CPU and the
CP 440.

Product Description
1-5
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
CPU Versions
The CP 440 can be operated with all CPU versions except the CPUs listed in the
tables below:
Table 1-4 CPU Versions with Which the CP 440 Can Be Used as of the Version Indicated
CPU MLFB
CPU 412-1 6ES7 412-1XF01-0AB0, Release 5
CPU 413-1 6ES7 413-1XG01-0AB0, Release 5
CPU 413-2 6ES7 413-2XG01-0AB0, Release 5
CPU 414-1 6ES7 414-1XG01-0AB0, Release 5
CPU 414-2 with 128k 6ES7 414-2XG01-0AB0, Release 5
CPU 414-2 with 348k 6ES7 414-2XJ00-0AB0, Release 7
CPU 416-1 6ES7 416-1XJ01-0AB0, Release 5
CPU 416-2 with 0.8 M 6ES7 416-2XK00-0AB0, Release 7
CPU 416-2 with 1.6 M 6ES7 416-2XL00-0AB0, Release 7
CPU 416-2 DP ISA Lite
CPU 416-2 DP ISA
CPU 412-2 DP PCI
CPU 416-2 DP PCI
6ES7 616-2PK00-0AB4, Release 3
Table 1-5 CPU Versions with Which the CP 440 Cannot be Used
CPU MLFB
CPU 412-1 6ES7 412-1XF00-0AB0
CPU 413-1 6ES7 413-1XG00-0AB0
CPU 413-2 6ES7 413-2XG00-0AB0
CPU 414-1 6ES7 414-1XG00-0AB0
CPU 414-2 with 128k 6ES7 414-2XG00-0AB0
CPU 416-1 6ES7 416-1XJ00-0AB0

Product Description
1-6 Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
1.3 Design of the CP 440
Interface
The CP 440 communication processor is supplied with an integrated serial X27
(RS422/485) interface.
Arrangement of the Controls and Indicators
Fig. 1-1 shows the arrangement of the controls and indicators on the front panel of
the CP 440 communication processor.
RxD
TxD
FAULT
EXTF
INTF
X 2
3 4
440 – 1CS00 – 0YE0
CP 440 CP 440
INTF
EXTF
FAULT
TxD
RxD
Integrated
X27
(RS422/485)
interface
V1.0.0 Firmware version
Figure 1-1 Arrangement of the Controls and Indicators on the CP 440 Communication
Processor

Product Description
1-7
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
LEDs
The following LEDs are located on the front panel of the CP 440:
•INTF (red) Indicates an internal fault
•EXFT (red) Indicates an external fault
•FAULT (red) Fault LED for interface
•TXD (green) interface sends
•RXD (green) interface receives
The operating modes and faults and errors indicated by these LEDs are described
in Section 8.2. Section 5.5 contains information on the LEDs that come on when
you download firmware updates.
Interface
For a detailed description of the interface, see Section 1.4.
Base Connector for the S7 Backplane Bus
On the back panel of the CP 440 you will find the base connector for the S7-400
backplane bus.
The S7-400 backplane bus is the serial data bus via which the CP 440
communicates with the modules of the programmable controller.

Product Description
1-8 Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
1.4 Features of the X27 (RS 422/485) Interface
Definition
The X27 (RS 422/485) interface is a differential voltage interface used for serial
data transmission in compliance with the X27 standard.
Features
The X27 (RS 422/485) interface has the following features and meets the following
requirements:
•Type: differential voltage interface
•Front connector: 15-pin sub D female with screw fixing
•Max. transmission rate: 115.2 kbps
•Max. cable length: 1200 m at 19200 bps*
•Standard: DIN 66259 Parts 1 and 3,
EIA-RS 422/485, CCITT V.11
•Degree of protection: IP00
Note
The X27 (RS 422/485) interface can only be run in 4-wire mode with the 3964(R)
protocol.
1.4.1 Cables for Connecting the CP 440 to a Communication Partner
Standard Connecting Cables
For point-to-point connection between the CP 440 and a communication partner,
Siemens offers standard connecting cables in various lengths.
The lengths and order numbers of these cables are listed in Appendix D.
Constructing Your Own Connecting Cables
If you make your own connecting cables, there are some points you must be
aware of. These are described in Appendix B, along with wiring plans and the pin
allocation for the sub D male connector.
* To find out which cable types you can use, see Appendix B.

2-1
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Basic Principles of Serial Data
Transmission
In Section You Will Find on Page
2.1 Serial Transmission of a Character 2-2
2.2 Transmission Procedure with a Point-to-Point Connection 2-6
2

Basic Principles of Serial Data Transmission
2-2 Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
2.1 Serial Transmission of a Character
There are various networking alternatives for the transfer of data between two or
more communication partners. The simplest form of data interchange is via a
point-to-point connection between two communication partners.
Point-to-Point Connection
In a point-to-point connection the CP 440 communication processor forms the
interface between a programmable controller and a communication partner. In a
point-to-point connection with the CP 440, the data is transferred serially.
Serial Data Transmission
In serial transmission, the individual bits of each byte of information are transmitted
one after the other in a fixed order.
Drivers for Bidirectional Data Traffic
The CP 440 executes data transfer with communication partners independently via
the serial interface. The CP 440 is equipped with two different drivers for this
purpose.
Bidirectional Data Traffic:
•ASCII driver
•3964(R) procedure
The CP 440 executes data transfer via the serial interface depending on the
selected driver.