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Handshaking Register
Handshaking synchronizes the timing of the sending or receiving of MEMOBUS/Modbus message data between the
option and the PROFIBUS-DP master.
When the master toggles bit 7 of the handshaking register in the output data, the option starts to process the data in the
MEMOBUS/Modbus registers. Ensure that the data in the MEMOBUS/Modbus registers is valid before toggling bit 7.
When the option toggles bit 7 of the handshaking register in the input data to the same value as handshaking register bit 7
in the output data, the content of the input data MEMOBUS/Modbus registers is valid.
Handshaking Output Register
PROFIBUS-DP Master to option
Bit 7
6
5
4
HS
–
–
–
Bit
Name
7
HS
1 to 6
–
0
INIT
Handshaking Input Register
Option to PROFIBUS-DP Master
Bit 7
6
5
4
HS
STATUS
Bit
Name
7
HS
5 to 6
STATUS
<1>
1 to 4
WD
<1>
0
–
<1> STATUS and WD are for reference.
YASKAWA ELECTRIC SIEP C730600 42B 1000-Series Option SI-P3 Technical Manual
3
2
1
0
–
–
–
INIT
Handshaking bit. Synchronizes send and receive timing. Changes status when sending new command messages.
This bit is reset to 0 at power up or by setting the handshaking output register bit INIT to 1.
Not used.
Clears the handshaking bit to 0.
3
2
1
0
WD
–
Handshaking bit. Synchronizes send and receive timing. Changes status when sending new command
messages.
This bit is reset to 0 at power up or by initializing the handshaking output register bit INIT back to 0.
Status of the data exchange between the PROFIBUS-DP master and the drive.
00H: Idle
01H: SI-P3 sends a MEMOBUS/Modbus command to the drives
10H: SI-P3 waits for a MEMOBUS/Modbus response from the drives
11H: SI-P3 receives a MEMOBUS/Modbus response from the drives
Counter increases every 64 ms
Not used
7 Option Data and I/O Maps
Function
Function
25
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