Omron F250-UME Software Manual page 846

Parallel Interface
Handshaking
Using the STEP Signal as the Measurement Trigger
Enter Run Mode
OFF
RUN
ON
STEP input
OFF
BUSY
ON
OR
DO
OFF
GATE
ON
OFF
DSA
ON
Timeout time
A timeout error will be generated if the
DSA signal does not turn ON within
the set time from when the
measurement was completed.
CHECK
6-1-(11)
When handshaking is set, the Controller outputs measurement results to the
external device while synchronizing communications. Handshaking is effective
when multiple measurement results are output in numerical order and the
handshaking function transfers data with more certainty.
Example: When 3 Expressions Are Set for DO data
Measuring
Overall judgement (Output when measurement is
completed, regardless of the status of DSA.)
Data 0
Gate ON
delay
With the exception of DSA, the functions of the I/O signals are the same as
when output control is set to None.
I/O Signals
Signal
DSA DSA is the signal from the external device that requests transmission of
the next batch of data. The Controller does not output data until DSA goes
ON. Turn ON the DSA signal when the following conditions are met:
œ
The external device's data receiving system is ready to receive more
data.
œ
The Controller has completed measurements.
Generally, the BUSY signal will be ON while the Controller is measuring
and the BUSY signal can be used to indicate when measurements are
completed. If the BUSY signal's OFF timing has been changed to go OFF
when image inputting is completed, the Controller may still be measuring
even though the BUSY signal has gone OFF. (The BUSY signal's OFF tim-
ing is set in SYS/Measurement control.)
Refer to the
Data 1
Timeout time
A timeout error will be generated if
the DSA signal does not turn OFF
within the set time from when the
GATE signal turned ON.
Function
Section 6-1
Exit Run Mode
Data 2
for more details.