Omron FH series User Manual page 34

Data Output Control with Handshaking
The timing for data output can be controlled through the DSA and GATE signals.
This is useful when receiving output data from multiple Output Units, because it enables you to control the timing
for transferring output data.
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 EtherCAT Communications: Refer to
p.222).
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 Controller.
While the DSA signal is ON, the GATE signal turns ON when the measurement data is output from the
Sensor Controller.
The external device receives the measurement data when the GATE signal turns ON.
Signals Used for Handshaking
Signal
DSA
GATE
*1: If handshaking is not enabled for output control, the GATE signal will also be turned ON when data is output from the Sensor
Controller. However, if handshaking is disabled for output control during PLC Link communications, the GATE signal is not
even output.
External device
(1) The PLC turns ON the DSA signal and waits for the output data.
(2) The Sensor Controller turns ON the GATE signal when the DSA signal is ON and it is ready to output
the measurement results(*1).
(3) The Sensor Controller turns ON the GATE signal and outputs the output data.
*1: This is when an Output Unit in the measurement flow is executed.
32
Control Methods Using an External Device
Communications Specifications Settings for each communications protocol.
Communications Specifications Settings (p.303).
Communications Specifications Settings (p.166).
Name
Data Output Request This signal is sent from the external device (PLC) to the Sensor
Signal Controller to request data output.
This signal is sent by the Sensor Controller to the external device (PLC)
Data Output Completion
to tell the PLC when to receive the output data. This signal is sent only
Signal
while the DSA signal is ON.
(1) DSA signal
(3) Measurement results output
Communications Specifications Settings (p.63 or
Description
*1
Sensor Controller
(2) GATE signal
Vision System FH/FZ5 Series User's Manual
for Communications Settings (Z342)