"PLC Type" messages are controlled by a single word memory location of a PLC. These messages have the highest priority and they overwrite any Local messages that might exist on a Text panel at any given time. When these messages are entered in the EZSeries Text software, They are assigned a specific number by which they are referenced and archived. When the word memory location dedicated for PLC Type messages points to a specific message number, the message corresponding to that number is displayed on the panel.

The activation of a PLC Message will cause the PLC message LED to illuminate. This is an indication to the operator that the message being displayed has been triggered by the PLC. When a PLC Message is displayed, the operator may press the ESC key on the panel keypad to switch back to Local Messages. The ESC key may be pressed an additional time to view the most recently displayed PLC Messages.

The super bright PLC Message Indicator LED is another example of a simple yet very powerful and innovative feature offered by EZAutomation/AVG.