Triggering messages, Single bit, Least significant bit – Rockwell Automation 2711-ND3 PanelBuilder v2.60 Software User Manual User Manual
Page 208: Value
13–4
Creating Message Displays
Publication 2711-6.0
The 3 types of data that can trigger a message to display are:
•
Single Bit
•
Least Significant Bit
•
Value
Single Bit
Single Bit is valid only for 2-state message displays. The display is
controlled by the status of a single bit. Turning the tag address bit on
or off toggles the display between message 0 and message 1.
Least Significant Bit
When Least Significant Bit is selected, the terminal displays the
message corresponding to the Least Significant Bit (LSB) at the tag
address data words (0 to 1,999 bits). More than one bit may be set at
the tag address allowing messages to display in a priority sequence
(message 0 displays when bit 0 is ON, message 1 displays when bit 1
is ON, ..., message 1,999 displays when bit 1,999 is ON.)
An error state occurs when all bits are OFF (low). The message
defined for the error state (State E) displays, if defined. The default
message is “Error”.
The controller must clear the last bit displayed. The next time the
terminal reads the tag address, the message corresponding to the next
least significant bit is displayed. The following example shows what
happens if bits 1 and 24 are set at tag address N7:2.
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
24
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
Automatic Shutdown at 13:33
Pump 3 Overload
Tag Address N7:3 = 256
Tag Address N7:3 = 256
Tag Address N7:3 = 256
Tag Address N7:2 = 2
Tag Address N7:2 = 0
Tag Address N7:2 = 0
Message #1 Displayed
Message #24 Displayed
Controller Program Clears Bit 1
24
24
1
1
Value
When Value is selected, the controller triggers a message when the
tag address contains a specific value. The message is displayed until
the value at the tag address is changed.
Triggering Messages