Logic Blocks

Overview

The FBD Editor uses various logic blocks accessible through the Logic blocks bar in the Toolbox:

Function	Icon	FBD symbol	Description
`AND`			If all the inputs (ON or OFF values, respectively 1 or 0) are ON, the output is ON. If at least one input is OFF, the output is OFF. NOTE: Unconnected inputs are assumed to be ON.
`NOT`			If the input (ON or OFF values, respectively 1 or 0) is ON, the output is OFF. If the input is OFF, the output is ON.
`OR`			If at least one input (ON or OFF values, respectively 1 or 0) is ON, the output is ON. If all the inputs are OFF, the output is OFF. NOTE: Unconnected inputs are assumed to be OFF.

Function

Icon

FBD symbol

Description

AND

If all the inputs (ON or OFF values, respectively 1 or 0) are ON, the output is ON.

If at least one input is OFF, the output is OFF.

NOTE: Unconnected inputs are assumed to be ON.

NOT

If the input (ON or OFF values, respectively 1 or 0) is ON, the output is OFF.

If the input is OFF, the output is ON.

OR

If at least one input (ON or OFF values, respectively 1 or 0) is ON, the output is ON.

If all the inputs are OFF, the output is OFF.

NOTE: Unconnected inputs are assumed to be OFF.

NOTE: Placing cursor over the icon will reveal a tool tip defining the icon. This will help you distinguish which type of block is represented by that icon.