Omron FH series User Manual page 35

DSA Signal ON Timing
Turn ON the DSA signal when you want to receive data.
The Sensor Controller will output data when an Output Unit has been executed, there is data waiting to be
output, and it detects that the DSA signal is ON.
Measurement flow
DSA (data output request) signal status
Start measurement.
Processing items related to results output
Processing item
To output measurement results immediately, execute the measurement trigger and turn ON the DSA signal.
The Sensor Controller does not monitor when the DSA signal changes from OFF to ON. It only checks for the
ON state.
Therefore, the measurement results will be output from the Sensor Controller to the external device
immediately after an Output Unit is executed and the output data must be received by the PLC at this time.
Measurement flow DSA (data output request) signal status
Start measurement.
Processing items related to results output
Processing completed.
Receiving Multiple Continuous Output Data Items
When receiving multiple output data items from multiple Output Units, use the DSA and GATE signals to
receive the items one at a time.
Example: PLC Link Communications with Handshaking
Measurement trigger
(e.g., STEP signal)
Data Output Request
(DSA) signal
Result Completion
(GATE) signal
Output data
(DATA 0 to 7)
Vision System FH/FZ5 Series User's Manual
for Communications Settings (Z342)
OFF
No data output.
ON
Data output started.
OFF
ON
Data output started.
Output Unit 1 executed.
Wait for the
first output data.
ON
OFF
ON
OFF
ON
OFF
(1) (2) (3) (4) (5)
Output Unit 2 executed.
Wait for the
second output data.
First
Second output data
output data
(6)
Control Methods Using an External Device
1
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