Delta C2000 Series User Manual page 510

6 LD T0
AND M3
ORB
7 ANB
8 OUT Y1
TMR T0 K10
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):
Rising-edge
X0
OFF
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.
LD command
AND Block
Time
ON OFF
AND command
OR command OR command
16-18
LD command
OR Block
Falling-edge
X0
OFF
ON
AND command
OR command
Time
OFF