Omron FQ2-S/CH Series User Manual page 33

Data Output Control with Handshaking
The timing for data output can be controlled through the DSA and GATE signals.
The handshake function can only be used with EtherNet/IP, PLC Link, PROFINET, and parallel communication
(when a Sensor Data Unit is used).
Requirements for Using Data Output Control with Handshaking
To use data output control, set the output control method to [Handshaking] in the communications protocol
settings. For details, refer to
• Parallel Communications: Refer to
• PLC Link Communications: Refer to
• EtherNet/IP and PROFINET Communications: Refer to
p.149).
Handshaking
If the external device does not turn ON the DSA signal, the measurement data will not be output to the external
device from the Sensor.
While the DSA signal is ON, the GATE signal turns ON when the measurement data is output from the Sensor.
The external device receives the measurement data when the GATE signal turns ON.
Signals Used for Handshaking
Signal
DSA Data Output Request Signal
GATE Data Output Completion Signal
*1: If handshaking is not enabled for output control, the GATE signal will also be turned ON when data is output from the Sensor.
External device
(1) The PLC turns ON the DSA signal and waits for the output data.
(2) The Sensor turns ON the GATE signal when the DSA signal is ON and it is ready to output the
measurement results.
(3) The Sensor turns ON the GATE signal and outputs the output data.
FQ2-S/CH User's Manual
for Communications Settings
Communications Specifications Settings for each communications protocol.
Setting Data Communications Specifications: p.66.
Setting Up PLC Link Communications: p.124.
Name
This signal is sent from the external device (PLC) to the Sensor to
request data output.
This signal is sent by the Sensor to the external device (PLC) to
tell the PLC when to receive the output data. This signal is sent
only while the DSA signal is ON.
(1) DSA signal
(3) Measurement results output
Communications Specifications Settings (p.92 or
Description
*1
Sensor
(2) GATE signal
Control Methods Using an External Device
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