Siemens Simatic S7-400

Technical speci󹪝cations X27 (RS 422/485) interface
The following table contains the technical speci󹪝cations of the X27 (RS 422/ 485) interface of
the CP 440-RS 422/485.
Table 10-1 Technical speci󹪝cations of the X27 (RS 422/485) interface
Technical speci󹪝cations
Interface RS 422 or RS 485, 15-pin sub D female
RS 422 signals
RS 485 signals
TXD (A), RXD (A), TXD (B), RXD (B), GND
R/T (A), R/T (B), GND
all isolated against the S7-internal power supply (backplane bus) and the
external 24 V DC supply
Max. distance 1200 m
Max. baud rate 115200 bps
Technical speci󹪝cations of the 3964(R) procedure
The following table contains the technical speci󹪝cations of the 3964(R) procedure.
Table 10-2 Technical speci󹪝cations of the 3964(R) procedure
3964(R) procedure with default values
Max. message frame
length
400 bytes (see chapter "Overview of the Function Blocks (Page 73)")
Parameter can be assigned parameters:
• With/without block check character
• Priority: low/high
• Transmission rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 76800, 115200 bps
• Character frame: 9, 10, 11 or 12 bits
• Initial state of receive line: none, R(A)5V/R(B)0V, R(A)0V/R(B)5V
• Number of bu󹪜ered message frames: 1 to 10, use entire bu󹪜er
3964(R) procedure, can be assigned parameters
Technical speci󹪝cations
10.1 Technical Speci󹪝cations of the CP 440
Point-to-point connection CP 440 Installation and Parameter Assignment
118 Equipment Manual, 03/2022, A5E00057742-AE