KEYENCE LS-7600 - Manual (Page 102)

5-40
Chapter 5 Function Settings
5
■
Self-timing Hold
The LS-7600 Series in self-timing hold operation will detect targets automatically with
no external timing input. Then the measured value is displayed and output.
Judgment
Measured value Measured value
Measured value Measured value
Judgment
t
Sampling
period
Sampling
period
ST
time
ST
time
No internal
measured value
No internal
measured value
Internal measured value Internal measured value
Waiting for judgment
(---------- displayed)
Measured value
ON
OFF
RESET input
ON
OFF
Comparator output
ON
OFF
ON
OFF
BCD output
RS-232C output
Judgment awaiting output
(Comparator waiting output)
Strobe output
Warkpiece removed
Workpiece insertion Workpiece insertion
Internal
measured value
• When a workpiece is within the sensing distance, the emergence of the internal measured value will be
used as a trigger. Then data will be sampled for the averaging number after the preset self-timing (ST)
period is over. The determined internal measured value will be held. Then the value will be output.
• In the following cases, the LCD monitor will display the result waiting status “---.-----“ until the first measured
value is determined.
The LS-7600 Series is turned on, setting changes are made, program number changes are made,
RESET input is ON, or auto zero is input.
• Comparator output turns ON according to the measured value.
• In the above chart, the ON status of each output means that NPN open collector output is ON, provided
that it is normally open type. If it is normally closed type, the signal will be inverted.
• The ON status of each input means that the input is short-circuited to the COM terminal.
• RS-232C output is ON in synchronization with timing input if the D-SEND item as an environment setting is
set to S1 or S2 only. Refer to Data Transmission Mode on page 6-9 for environment settings in detail.
• Timing input is ignored.
• If the internal measured value during a sampling period becomes “---.-----,” the LCD monitor will display the
result waiting status “---.-----.”
• RESET input can be under RS-232C control. Refer to page 8-11 for details.
• Strobe output time can be changed. Refer to Strobe Output Time on page 5-
47 for details.
• The LCD monitor will display “HOLD” until the next workpiece is located in
the measuring area after the present measured value is determined.
Tips