Siemens Simatic S7-400

Backing up Con󹪝guration Data
A backup of CP 440 parameter data includes the storage of parameters, their download to the
CPU and transfer to the CP 440. Backup your CP con󹪝guration using the STEP 7 software.
You can 󹪝nd a detailed description in the chapter "Managing the Parameter Data (Page 68)" of
this manual.
Creating a User Program for the CP 440
CP 440 programming includes the implementation of the CP 440 in the STEP 7 user program of
your CPU. Program your CP 440 using the language editors of the STEP 7 software.
A detailed description of programming with STEP 7 is available in the Programming with STEP 7
manual.
Communication with the help of the CP 440 function blocks is described in the chapter
"Communication via Function Blocks (Page 73)".
A comprehensive programming example is available in the chapter "Programming Example for
Standard Function Blocks (Page 107)".
Commissioning the physical interface
If there is no communication with the partner device after con󹪝guration has been completed,
you should test the connection. To do this, proceed as follows:
1. What might be the possible cause:
– Is the polarity of the send/receive lines reversed?
– Are the default settings correct? Several defaults may have been set with di󹪜erent
polarity. The default settings may already be integrated in the device on a permanent
basis.
– Missing or wrong terminating resistors?
– High byte and low byte mixed in the security word (e.g. CRC)?
2. How to proceed:
– First of all, use the manual to check the line connection:
- Assignment (see Appendix "AUTOHOTSPOT")
- Polarity (see Appendix "AUTOHOTSPOT")
- Default settings (see chapter "Con󹪝guration data (Page 57)")
– Carry out a setup test
3. Carry out the simplest setup possible:
– Connect only 2 nodes to each another
– If possible, use 2-wire cable (RS485)
– Use a short cable
– Terminating resistors are not required due to the short distance
– Send 󹪝rst in one direction and then in the other
Commissioning the CP 440
Point-to-point connection CP 440 Installation and Parameter Assignment
50 Equipment Manual, 03/2022, A5E00057742-AE