Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 99)

7–11 Configuration: Scanner Control, Primary Match Table, Discrete I/O
Publication 2755-833
Trigger Timeout
Field Type Options
Edit 10 through 9999 or 0
Determines the length of time (in milliseconds) the Scanner B laser
remains on after receiving a start trigger. The trigger timeout
determines a no-read condition for Scanner B. The default is 0,
which disables the timer.
To set the trigger timeout, enter a number between 10 and 9999. ➀
The timer has an accuracy of
±
5 milliseconds. Select a value that
allows enough time for the decoder to read an entire package or a
no-read will occur.
When Scanner B is triggered, the timer starts. If a package is not
processed successfully within the elapsed time Symbols/Package
setting is not satisfied), a no-read occurs.
Note: The Trigger Timeout acts like the No-Read Timer if the
Scanning Mode is independent; it is not used if the Scanning Mode is
set to coordinated.
Package Detect Input Parameters
These parameters control the package detect input for Scanner A and
B. Each parameter is defined below. The options for each parameter
are summarized in a table, and explained more fully in the text. The
default setting for each parameter is displayed in bold letters in the
table.
Package Detect Input A Filter
Field Type Options
Select
Yes
No
Enables or disables the debounce filter for the package detect signal
on Scanner A. The default is No which disables the filter. When
disabled, the decoder recognizes any signal greater than 1
millisecond as a start trigger.
➀ ATTENTION: Set output durations in multiples of 5 milliseconds. Actual output will have a worst-case precision
of +0 to –5 milliseconds, varying with the timing of the output. Durations that are not set in multiples of 5
milliseconds will be rounded up to the nearest multiple of 5 and function within the same +0 to –5 millisecond
precision.
For example, a setting of 25 milliseconds will result in a duration of from 20 to 25 milliseconds. A setting of 23
milliseconds will result in the same duration range.