Renaming Of Standard Functions - Siemens SIMATIC S7 Manual

5.5

Renaming of Standard Functions

Inducement
Behavior
Renaming
OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3
Whether you have already used the numbers of standard functions in your
project or the block number is reserved for a different application, you may
rename the internal called functions FC5/FC50 or FC6/FC60, FC10 or the
blocks MODBUSCP, MB_CPCLI and MB_CPSRV.
It is not possible to rename the system functions SFC6, SFC20, SFC24,
SFC51 and SFC52 as well as the system function block SFB4.
A set of rules concerning the function block numbering have to be considered
when rewiring function blocks in SIMATIC STEP 7 Manager.
If you want to rewire the blocks of the Modbus library, the following sequence
is required:
1. FC50 AG_LSEND
FC60 AG_LRECV
2. FB106 MB_CPCLI
FB107 MB_CPSRV
3. FB108 MODBUSCP
It is not necessary to rewire all blocks. Even if you want to rewire only some of
the blocks, you must follow the mentioned sequence.
To rename the blocks proceed as described subsequently:
1. Get the information about the used operand by clicking "Extras >
Reference data > Display".
2. Set the operand priority in the object properties of the block folder to
"Absolute value".
3. Call the function "Extras > Re-wire" in the SIMATIC Manager, in order
to re-wire the operands into free areas.
4. To be able to keep on using the symbolism diagnostics tools, add the
modifications in the symbolism table supplementary.
The modifications can be verified by clicking "Extras > Reference data >
Display".
Function Block MODBUSCP
5-17