Yaskawa 1000 Series Drive Option - Profibus-DP Technical Manual - Manual (Page 26)

7 Option Data and I/O Maps
26 YASKAWA ELECTRIC SIEP C730600 42B 1000-Series Option SI-P3 Technical Manual
„ 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 12 describes the handshaking function. The arrows indicate whether the PROFIBUS-DP master or
the option has the control for the protocol.
Figure 12
Figure 12 Example of Handshaking
0
0
1
1
1
1
0
0
0
0
1
0
0
0
0
1
1
1
1
0
0
0
PROFIBUS-DP Master
Handshaking Output Register
⇓
⇓
⇒
⇓
⇓
⇓
⇓
⇒
⇓
⇓
⇓
⇓
⇒
⇓
etc.
SI-P3 Card
Handshaking Input Register
Command Executed
Response Valid
New MEMOBUS/Modbus
Command to SI-P3 Card
Response Valid
Create
Command
Signal New
Message Waiting
Create
Command
Synchronize Command Bits
to Start the Message Process
Synchronize command bits
to start the message process
Signal New
Message Waiting
Signal New
Message Waiting
Create
Command
Command Executed
New MEMOBUS/Modbus
Command to SI-P3 Card
New MEMOBUS/Modbus
Command to SI-P3 Card