VIPA CPU 21 Series - Page 275

Manual VIPA CPU 21x Chapter 9 Deployment CPU 21xSER-1
HB103E - Rev. 05/45 9-17
The following text shortly illustrates the structure of programming a send
command for the different protocols.
3964R USS / Modbus master
SFC 217
SER_SND
Busy ?
RetVal 8xxxh /
90xxh ?
RetVal 2001h ?
RetVal 2000h ?
N
N
N
Error evaluation
End
J
J
J
Data evaluation
End
N
J
SFC 217
SER_SND
RetVal 8xxxh /
90xxh ?
RetVal 2001h ?
RetVal 2000h ?
N
N
Error evaluation EndJ
J
SFC 218
SER_RCV
Data evaluation End
N
J
SFC 218
SER_RCV
Error evaluation End
Ende
RetVal 700xh ?
N
J
ASCII / STX/ETX Modbus slave
SFC 217
SER_SND
RetVal 900xh
Error evaluation
End
J
N
SFC 217
SER_SND
RetVal 9001h ?
Error evaluation
J
SFC 218
SER_RCV
N
RetVal 0000h ?
RetVal 8xxxh ?
N
Data evaluation
Error evaluation
N
J
Start
RetVal 0000h ?
N
J
J
RetVal 700xh ? J
N
Principles of
programming