YASKAWA PROFIBUS-DP SI-P3 Technical Manual page 33


Example of Handshaking
Clear the handshaking register HS bit (bit 7) to 0 for the PLC program after turning on the power supply or after
re-initializing. Figure 22
the option has the control for the protocol.
Figure 21
Synchronize Command Bits
to Start the Message Process
Create
Command
Signal New
Message Waiting
Create
Command
Signal New
Message Waiting
Create
Command
Signal New
Message Waiting
YASKAWA ELECTRIC SIEP C730600 82D YASKAWA AC Drive Option SI-P3 Technical Manual
describes the handshaking function. The arrows indicate whether the PROFIBUS-DP master or
PROFIBUS-DP Master
Handshaking Output Register
0
⇓
0
⇓
1
1
1
⇓
1
⇓
0
0
0
⇓
0
⇓
1
Figure 22 Example of Handshaking
SI-P3 Card
Handshaking Input Register
0
0
⇒
0
⇓
0
⇓
1
1
⇒
1
⇓
1
⇓
0
0
⇒
0
⇓
etc.
7 Conventional Formats
Synchronize command bits
to start the message process
New MEMOBUS/Modbus
Command to SI-P3 Card
Command Executed
Response Valid
New MEMOBUS/Modbus
Command to SI-P3 Card
Command Executed
Response Valid
New MEMOBUS/Modbus
Command to SI-P3 Card
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