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Chapter 16 PLC Function Applications│CFP2000
Explanation of basic structure of ladder diagrams
LD (LDI) command: An LD or LDI command is given at the start of a block.
LDP and LDF have this command structure, but there are differences in their action state. LDP, LDF
only act at the rising or falling edge of a conducting contact. (see figure below):
AND (ANI) command: A series configuration in which a single device is connected with one device
or a block.
ANDP, ANDF also have structures like this, but their action occurs at the rising and falling edge.
OR (ORI) command: A single device is connected with one device or a block.
ORP, ORF also have identical structures, but their action occurs at the rising and falling edge.
ANB command: A configuration in which one block is in series with one device or block.
16-19
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