Buffering Triggered By Value Change In Analog Input - Panasonic FP7 User Manual

Optional Settings for Analog Input

6.7.4 Buffering Triggered by Value Change in Analog Input

Buffering by change in trigger input
The following sequence shows the operation of starting buffer processing with the detection of
a rise or fall of the digital converted value on a specified analog input channel. The example
below shows a case where the level of analog input CH0 rises.
(K)
Analog input trigger level
Digital converted
value CH0 to CH3
Digital converted
value CH0
(Flag/Data)
(1)
Buffer execution
relay (*1)
Buffer
(Unit memory)
Pre-trigger data
enabled (*2)
Buffering flag (*3)
Buffering
completion flag
(*4)
Read completion
relay (*5)
(1) Pre-trigger buffering will start when the user program turns ON the buffer execution relay.
(2) The pre-trigger data enabled flag is turned ON when the number of pre-trigger data items
is reached.
(3) Buffering will start because the preset digital conversion value on CH0 has risen above the
trigger level. Buffering will continue until the set number of buffer data items is reached
after the rise of the trigger level.
(4) Buffering is completed with the number of buffer data items obtained.
(5) The user program reads the buffering data and turns ON the read completion relay.
(6) The unit waits for the next trigger and repeat the sequence from pre-trigger buffering.
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6-22
Starts buffering at specified cycle.
Pre-trigger buffering
(2)
(3)
(4)
Buffering
(5)
Buffer read
(6)
Pre-trigger
(t)