Function Block Diagram

Every block in the FBD palette, by tab.

• FBD overviewBlocks and wires, from tags in to tags out.
• Variable blocksREAD, WRITE and CONST put values on wires and take them off.
• Bit logic blocksAND, OR, XOR and NOT combine true/false signals.
• Compare blocksCompare two numbers and get a true/false result.
• Math blocksAdd, subtract, multiply and divide wired values.
• Timer and counter blocksTimers and counters with an enable input and state outputs.
• Output and edge blocksLatch, unlatch and one-shot blocks.