The blocks that are available for Mode communication with SIMATIC S7 are delivered with a unique block number.
If there are already blocks in the user program that have these block numbers, there is a block number conflict.
You can rename the Mode blocks that are called directly in the user program.
You cannot rename the blocks that are called internally in the Mode blocks. You have to re-wire those blocks.
The table below shows the Mode blocks that you can rename or re-wire.
||Mode block > rename
||Internally called block > re-wire|
|Modbus TCP CP
|Modbus TCP Redundant
|Modbus TCP Redundant V2
|Modbus TCP PN CPU
||FB103, FB104, FB105|
You must follow a specific order when re-wiring the blocks that are called internally in the Mode blocks. This order must be kept in particular when re-wiring the T blocks in the case of Modbus TCP PN CPU.
- T blocks
- Internally called blocks (FB106, FB107, FB1734, FB908, FB906, FB103, FB104, FB105)
- Remaining blocks
You do not have to re-wire all the blocks. Even if you re-wire only a few internally called blocks, you must nevertheless keep to the order given above. In this case, you leave out the blocks that are not re-wired.