Process interfacing via an automation system (PLC, PC)
9.4 Control with FB 79
SIMATIC MV500
126 Operating Instructions, 06/2018, C79000-G8976-C494-01
Control with FB 79
Principle of data transmission via PROFINET IO
The following figure shows the interfaces of the optical reader that are relevant for data
transmission via PROFINET IO (FB 79).
Figure 9-3 Principle of data transmission via PROFINET IO (FB79)
Note
Relevant bytes of the user data
Bytes 1 to 31 of the "Send" user data
interface are relevant. Only bytes 1 to 4 of the
"Receive" user data interface are relevant.
Assignment of the interfaces relevant to PROFINET IO
Control/status byte
Table 9- 33 Assignment of control bytes (input signals)
0 DISA Disable
Disables manual keyboard input, program selection and program sav-
ing, error acknowledgment, starting the optical reader
1 SEL0
1)
Select 0
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