Omron SYSMAC FH Series User Manual page 121

(1) The Sensor Controller (slave) outputs data when the Fieldbus Data Output Unit starts execution.
(2) Data is output each time that the Fieldbus Data Output Unit is performed for the second time or oth-
er Fieldbus Data Output Unit is performed. In that time, the output data for the first time is overwrit-
ten.
Precautions for Correct Use
Set the Output period in the communication settings to a time that is longer than the Output
time.
l With handshaking
The Result Notification signal switches from OFF to ON when the Controller (master) switches the
Result Set Request signal from OFF to ON.
At that time, data that is possible to output will be output.
The Controller (master) checks that the Result Notification signal is ON and acquires the data, and
then it needs to switch the Result Set Request signal from ON to OFF.
In the case where multiple Fieldbus Data Output Units perform the data output, the Controller
(master) needs to turn the Result Set Request signal ON again to instruct next data output when
the Sensor Controller (slave) switched the Result Notification signal from ON to OFF.
*1: Data prepared for output which an Output Unit has been already performed in the measurement flow.
The Trigger signal
is turned ON at the
same time.
ON
Result Set
Request signal
OFF
Result
ON
Notification
signal
OFF
ON
Output data
OFF
*: A timeout error will occur if any of the following states continues for longer than the timeout time that is set in the EtherCAT settings.
• If the Result Set Request signal is not turned ON after a certain time elapses from when the Output Unit is executed.
(Turn ON the Result Set Request at the same time as the measurement trigger input or the command input.)
• If the Result Set Request signal is not turned OFF after a certain time elapses from when the Result Notification signal turned ON.
(1) The Controller (master) turns the Result Set Request signal ON.
(2) When the Fieldbus Data Output Unit in the measurement flow is performed, the Sensor Controller
(slave) writes the data and then turns the Result Notification signal ON.
(3) The Controller (master) acquires the data and then turns the Result Set Request signal OFF.
(4) The Sensor Controller (slave) turns the Result Notification signal OFF.
(5) In the case where multiple Fieldbus Data Output Units are placed in the measurement flow, the Con-
troller (master) turns the Result Set Request signal ON and then waits for the next Fieldbus Data
Output Unit performed.
(6) When the next Fieldbus Data Output Unit is performed, the Sensor Controller (slave) writes the data
and then turns the Result Notification signal ON.
FH/FHV Series Vision System User's manual for Communication Settings (Z342-E1)
2 Methods for Connecting and Communicating with External Devices
Fieldbus Data Output
Fieldbus Data Output
Unit execution
Unit execution
Wait for the first Wait for the second
output data. output data.
* *
First data output
Second data output
(1) (2) (3) (4) (5) (6)
*1
The Controller (master) switches the Result Set Request signal from
OFF to ON at the same time that the Trigger signal or Command
Request signal switches from OFF to ON, and waits for the first data
output.
When the Result Notification signal is ON, the Controller (master)
reads the data and switches the Result Set Request signal back to
OFF.
When the Result Notification signal has switched from ON to OFF,
the Controller (master) switches the Result Set Request signal from
OFF back to ON, and waits for the second data output.
The Sensor Controller (slave) checks that the Result Set Request
signal has turned OFF, then automatically turns the Result Notification
signal OFF.
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