Rockwell Automation 2711 PANELBUILDER SOFTWARE USER MANUAL - Manual (Page 77)

Planning Your Application
Chapter 4
4-2
System Response to a PanelView Terminal Failure
The PanelView terminal stops remote I/O communication and appears as a
faulted I/O rack to the host PLC controller if:
the PanelView terminal is in configuration mode
the PanelView terminal loses AC power
the PanelView terminal has a major fault
the remote I/O link fails
When any of the above situations occur, the associated rack fault bit in the
PLC controller will turn on (set to 1). Also, the programmable controller’s
discrete input image table and any block transfer read files will maintain
the last input states received from the terminal prior to the failure.
If there is no valid PLC communication with PanelView, and power is
removed and re-applied to the PLC controller, the programmable
controller’s discrete input image table bits will be reset to zero; block
transfer read files will retain their current states.
To ensure recovery from a faulted rack condition, program the PLC
controller to:
monitor the rack fault bit associated with a PanelView terminal’s rack
assignment. Allen-Bradley PLC systems provide a rack fault bit table
which applies to PanelView terminals as well as to standard I/O racks.
Refer to your PLC documentation for specific information on this
function
return any machine, or process that it controls, to a safe state of
operation in the event of any of the PanelView terminal rack fault
conditions previously described
When you plan the screen positioning of push buttons, be sure to consider
the following:
Be careful not to use the same screen position for different buttons on
screens that might follow one another. An operator could inadvertently
press the same button position, mistaking a Start button on one screen
for a Stop button on another
Don’t place important buttons on touch screens in a position where they
will be blocked by a temporary window such as an Alarm window,
Information window or Terminal Fault window
Button Location
Considerations