Sample Project Cfc - Siemens SIMATIC S7 Manual

7.2

Sample project CFC

General
Information
Used Blocks
OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3
The sample project written in CFC includes two Simatic S7-400 stations, one
is parameterized as client, the other one as server.
The subsequent listed blocks are used in the provided example project with
FB MODBUSCP. The system functions, system function blocks and the
blocks which are generated by CFC are not listed in the following table.
Block Symbol
CYC_INT5
OB 35
COMPLETE
OB 100
RESTART
OB 121 PROG_ERR
FB 8 R_TRIG
FB 24 CTU
FB 99 Save_STATUS
FB 106 MB_CPCLI
FB 107 MB_CPSRV
FB 108 MODBUSCP
FC 500 AG_LSEND
FC 600 AG_LRECV
DB1 MEMORY_DB
DB 3 LICENSE_DB
DB 11 DATA_AREA_1
DB 12 DATA_AREA_2
DB 13 DATA_AREA_3
DB 14 DATA_AREA_5
DB 15 DATA_AREA_6
DB 16 DATA_AREA_7
Comment
Cyclic program processing
Start-Up OB for Re-Start
Programming error OB
Recognition of positive edge
Upwards counter
FB to save the error number and the name of the
according function
Internally called FB MB_CPCLI
Internally called FB MB_CPSRV
User block FB MODBUSCP
FC to send data
FC to receive data
Help DB in server mode
License DB for FB MODBUSCP
Value DB for area 1
Value DB for area 2
Value DB for area 3
Value DB for area 5
Value DB for area 6
Value DB for area 7
Application Sample
7-3