Siemens Simatic S7-400

Table of contents
Preface ................................................................................................................................................... 3
1 Product Description ............................................................................................................................. 11
1.1 Uses of the CP 440............................................................................................................. 11
1.2 Components Required for a Point-to-Point Connection with the CP 440............................... 12
1.2.1 Required Hardware Components ........................................................................................ 12
1.2.2 Required Software Components ......................................................................................... 13
1.2.3 Incompatible CPU versions ................................................................................................. 13
1.3 Design of the CP 440.......................................................................................................... 14
1.4 Features of the X27 (RS 422/485) Interface ........................................................................ 16
2 Basic Principles of Serial Data Transmission ........................................................................................ 17
2.1 Serial Transmission of a Character ...................................................................................... 17
2.2 Transmission Procedure with a Point-to-Point Connection ................................................... 20
2.3 Transmission integrity ........................................................................................................ 21
2.4 Data Transmission with the ASCII Driver.............................................................................. 23
2.4.1 Data Transmission with the ASCII Driver.............................................................................. 23
2.4.2 Sending Data with the ASCII Driver..................................................................................... 24
2.4.3 Receiving Data with the ASCII Driver................................................................................... 26
2.4.4 Topologies Between the Communication Partners .............................................................. 32
2.5 Data Transmission with the 3964(R) Procedure................................................................... 35
2.5.1 The Control Characters of the 3964(R) Procedure ............................................................... 35
2.5.2 Block Checksum................................................................................................................. 37
2.5.3 Sending Data with 3964(R) ................................................................................................ 38
2.5.4 Receiving Data with 3964(R) .............................................................................................. 41
2.5.5 Handling Corrupt Data ....................................................................................................... 46
3 Commissioning the CP 440 .................................................................................................................. 49
4 Mounting the CP 440 ........................................................................................................................... 53
4.1 CP 440 slots....................................................................................................................... 53
4.2 Mounting and Dismounting the CP 440.............................................................................. 53
4.2.1 Installation steps................................................................................................................ 54
4.2.2 Removal steps.................................................................................................................... 54
5 Con󹪝guring and Parameter Assignment the CP 440 ........................................................................... 55
5.1 Assigning parameters to the CP 440 ................................................................................... 55
5.2 Installing the Programming Interface ................................................................................. 56
5.3 Parameters for the Communications Protocols.................................................................... 56
5.4 Con󹪝guration data ............................................................................................................. 57
5.4.1 Introduction....................................................................................................................... 57
Point-to-point connection CP 440 Installation and Parameter Assignment
Equipment Manual, 03/2022, A5E00057742-AE 7