Explanation Of Basic Structure Of Ladder Diagrams - Delta CP2000 Series User Manual

Chapter 16 PLC Function Applications│CP2000
6 LD T0
AND M3
ORB
7 ANB
8 OUT Y1
TMR T0

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
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.
K10
LD command
AND Block
OFF
ON
OFF
AND command
OR command
LD command
OR Block
X0
Time
AND command
OR command OR command
16-20
Falling-edge
OFF
ON
OFF
Time