Rockwell Automation 2711 PANELBUILDER SOFTWARE USER MANUAL - Manual (Page 219)

Information and Alarm Windows
Chapter 7
7-11
Triggering Information Messages for the Binary or BCD Data Type
To trigger a message, the PLC controller must put a non-zero value which
corresponds to the desired message number into the designated PLC
address. For example, a “trigger value” of 19 would cause the Information
window to appear, displaying message number 19 from the Information
Message List. If the PLC controller changed the trigger value to 27,
PanelView would replace the message with message number 27. The
operator can clear the window by pressing the Clear button. The window
will also be cleared whenever the PLC controller sets the trigger value to
zero. If the operator presses the Clear button while a valid trigger value is
still in the PLC address, the window will clear until the trigger value
changes to another non-zero value or until the screen changes. If the PLC
controller places an invalid (out of range) trigger value into the PLC
address, PanelView fills the Information window with question marks.
Bit Position Data Type
If bit data type is assigned, the address assignment will be a contiguous bit
string containing from 1 to 496 bits. Each bit in the string has a
corresponding message number in the Information Message List. For
example, the first bit corresponds to message number one, the second bit
corresponds to message number two, etc. When more than one PLC word
is required, the next higher word numbers will be used. When you specify
the number of bits for this function, you determine the maximum number
of messages that you can trigger for the Information window.
Triggering Information Messages for Bit Position Data Type
To trigger a message, the PLC program must set the PLC output bit that
corresponds to the desired message number in the Information Message
List. If PanelView sees any bit set, it displays the Information window with
the respective message.
PanelView ranks the message bits. If PanelView sees more than one bit set
to on at the same time, the message associated with the least significant bit
will be displayed. The operator clears the message by pressing the Clear
button. The message will also be cleared whenever the PLC controller sets
the associated message bits to zero.
If the least significant bit turns off, the message associated with the next
active bit is displayed. If there are no active bits, the Information window
is cleared.