Omron FH series User Manual page 261

Using Handshaking
When the PLC (user) turns ON the Result Set Request (DSA) signal, the Result Completion (GATE) signal
turns ON.
At that point, the output data that can be output
The PLC (user) turns OFF the DSA signal when it has received the output data and when the Result
Completion (GATE) signal is ON.
If data is output from more than one Fieldbus Data Output Unit, turn ON the DSA signal again after the
Sensor Controller turns OFF the Result Completion (GATE) signal to output the next output data.
*1: This is the data that is prepared for output when the Output Unit is executed in the measurement flow.
The EXE signal is turned
ON at the same time.
ON
Data Output
Request
(DSA) signal
OFF
ON
Result
Completion
(GATE) signal OFF
ON
Output data 0 to 7
(DATA0 to DATA7)
OFF
*1 A timeout error will occur if any of the following states continues for longer than the timeout time that is set in the EtherNet/IP settings.
• If the DSA signal is not turned ON after a certain time elapses from when the Output Unit was executed. (Turn ON the DSA
signal at the same time as the measurement trigger command.)
• If the DSA signal is not turned OFF after a certain time elapses from when the GATE signal turns ON.
1
The PLC (user) turns ON the Command Request (EXE) signal and the Result Set
Request (DSA) signal at the same time. The output data for the first Fieldbus Data
Output Unit can be dependably received.
2
The Sensor Controller executes the Fieldbus Data Output Unit in the measurement flow.
Because the Result Set Request (DSA) signal is ON after the data is written, the Result
Completion (GATE) signal turns ON.
3
The PLC (user) reads the data when the Result Completion (GATE) signal turns ON and
it turns OFF the Result Set Request (DSA) signal.
4
The Sensor Controller automatically turns OFF the Result Completion (GATE) signal
when it detects that the Result Set Request (DSA) signal has turned OFF.
5
If there is more than one Field Data Output Unit in the measurement flow, the PLC (user)
turns ON the Result Set Request (DSA) signal when the Result Completion (GATE)
signal turns OFF and then waits for execution of the next Field Data Output Unit.
6
When the next Fieldbus Data Output Unit is executed, the GATE signal turns ON and the
data is output. Receive the second output data and then repeat steps 3 to 5, above.
Repeat steps 3 to 5 for any other data outputs.
Vision System FH/FZ5 Series User's Manual
for Communications Settings (Z342)
*1
is output.
Fieldbus Data Output Fieldbus Data Output
Unit execution Unit execution
Wait for the first Wait for the second
output data. output data.
(*1) (*1)
First data output Second data output
(1) (2) (3)(4)(5) (6)
The PLC turns ON the Result Set Request (DSA)
signal at the same time as the STEP or
Command Request (EXE) signal and waits for
the first output data.
The PLC reads the data when the Result
Completion (GATE) signal turns ON and it turns
OFF the Result Set Request (DSA) signal.
The PLC turns ON the Result Set Request again
when the Result Completion (GATE) signal turns
OFF and waits for the second data output.
The Sensor Controller automatically turns OFF
the Result Completion (GATE) signal when it
detects that the Result Set Request (DSA)
signal has turned OFF.
Communicating with EtherNet/IP
2
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