Omron FH series User Manual page 208

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 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.
Data Output
ON
Request
OFF
(DSA) signal
Result
ON
Completion
OFF
(GATE) signal
ON
Output data
OFF
*1: A timeout error will occur if the following states persist longer than the time set in the PLC Link settings ([Retry interval] for
Ethernet PLC Link, or [Timeout] for RS-232C/422 PLC Link).
• If the DSA signal is not turned ON after a certain time elapses from when measurement is finished. (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.
• If the DSA signal is not turned ON after a certain time elapses from when the GATE signal turns OFF.
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 Data Output Unit
can be dependably received.
2
The Sensor Controller executes the Data Output Unit in the measurement flow.
Because the Result Set Request (DSA) signal is ON, the Result Completion (GATE) signal turns
ON and the output data from the Data Output Unit is output to the external device.
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 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 Data Output Unit.
6
When the next 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.
206
Communicating with PLC Link
*1
is output.
Data Output Unit Data Output Unit
execution execution
Retry interval
*
Wait for the first Wait for the second
output data. output data.
* *
First data output
(1) (2)(3) (4) (5)
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.
Second data output
(6)
Vision System FH/FZ5 Series User's Manual
for Communications Settings (Z342)