Rockwell Automation 2711E-ND1 Reference Manual PanelBuilder 1400e - Manual (Page 63)

57 Numerics
Publication 2711E-6.15 – November 1998
Tip: If you want immediate indication of the value you’re sending
to the PLC, use the button’s Numeric Display component instead of a
Numeric Data Display. This is especially important for DH+ and
ControlNet applications when Auto-Repeat is enabled. Since the
DH+ and ControlNet network response can be slow, you do not want
to overshoot the target value when the button is auto-repeating. The
Numeric Display component shows the last value sent to the PLC.
Use a separate Numeric Data Display object if you want to feed back
the value you’ve written.
Note: When the button is released, the Numeric Display component
will be aware of any external changes to the Button Control and
update itself.
At runtime, if the numeric value cannot be displayed—for example,
if the field is too small—the Numeric Display component is filled
with asterisks (***).
Important: For Remote I/O applications, and ControlNet Scheduled
tags, the PanelView terminal can retain the current
Button Control value, even after the terminal is turned
off. Depending on how the Application Startup
operation is defined, the retained value (last state) or
initial value (default) is sent to the PLC when power is
reapplied.
For DH+ applications, ControlNet Unscheduled tags,
and Modbus applications, the current value cannot be
retained. Depending on how the Application Startup
operation is defined, the initial value or nothing
(default) is sent to the PLC when power is applied.
For details on configuring Application Startup
operation, see “Application Startup” in Chapter 5 of the
PanelView 1000e, 1200e, and 1400e Operator
Terminals User Manual.
!
ATTENTION: A control function should require
operator confirmation. Do not use this object on its
own to initiate a control function. Also, a retained
value could be used when the terminal is powered back
on, which could result in a control function starting
without the operator’s knowledge.
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