Commissioning the CP 440
Point-to-point connection CP 440 Installation and Parameter Assignment
58 Manual, 09/2007, A5E00057742-03
Creating a User Program for the Communication Processor
CP programming includes the implementation of the CP in the STEP 7 user program of your
CPU. Program your CP using the language editors of the STEP 7 software.
Further Information
A detailed description of programming with STEP 7 is contained in the
Programming with
STEP 7
manual.
Commissioning the Physical Interface
If there is no communication with the partner device after configuration 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 different
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:
- Pin assignment
- Polarity
- Default settings
– 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 first in one direction and then in the other
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