Rockwell-automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM Manuale Utente Pagina 36

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Publication AG-UM008C-EN-P - February 2005
1-18 Designing Communication
Figure 1.9
DF1 Radio Communication
Figure 1.10
Read or Write Requests via DF1 Radio Modem
Modem
Modem
Station 2
Station 1
2. Station 1 sends its reply message.
1. Message (via MSG instruction) sent to a specific
station (eg., station 1).
Send command
packet
Start reply
timer
Wait for reply
(or timeout)
Ladder logic
triggers MSG
DF1 driver
formats
command
packet
Data table
reply timeout received
return error indication
reply packet received return data
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