Instructions:
In some cases it can happen that an online connection cannot be set up between the PG and the module and an error message is displayed. Most causes can be determined through the notes in the Online Help which you reach by clicking on "Help". The table below describes some measures and remedies that can be applied when communication or an online connection is not possible between the programming device and the CPU. The most common reasons for loss of the online connection are as follows:
- Incorrectly configured module in the HW Config
- Incorrectly configured address
- Incorrectly set PG/PC interface
- Baud rate doesn't match the network baud rate
- Not enough memory on the hard disk for the swap file
- Incorrectly set PROFIBUS DP interface
- Incorrectly set MPI interface
- Differences in the program between online and offline
- Permitted cycle time increase set too low
- Incorrectly set bus profile
1. Incorrectly configured module in the HW Config
Check whether the modules slotted in the rack (CPU, CPs) have the correct hardware configuration. The CPU and CP types must match the configuration. If you have configured an incorrect module, the system block loading procedure might be aborted and you get an error message like:
- Download (13:4589)
The system data could not be loaded on the module ... at station ...
"SDB 200 could not be loaded",
or "Parameters of the DP system data module are not valid".
Remedy:
In the Hardware Configuration you configure the modules with the correct MLFB number (e.g. 6ES7315-2AF03-0AB0 for a CPU 315-2DP). Save and compile the hardware configuration and repeat the loading procedure.