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Chapter 16 PLC Function CH2000 Series

16-13

The explanation of command order:

1 LD X0

2 OR M0

3 AND X1

4 LD X3

AND M1

ORB

5 LD Y1

AND X4

6 LD T0

AND M3

ORB

7 ANB

8 OUT Y1

TMR T0 K10

The detail explanation of basic structure of ladder diagram

1. LD (LDI) command: give the command LD or LDI in the start of a block.

AND Block OR Block

LD command LD command

The structures of command LDP and LDF are similar to the command LD. The difference is that

command LDP and LDF will act in the rising-edge or falling-edge when contact is ON as shown in

the following.

OFF

Time

Falling-edge

OFF

Time

Rising-edge

2. AND (ANI) command: single device connects to a device or a block in series.

AND command AND command

The structures of ANDP and ANDF are the same but the action is in rising-edge or falling-edge.

3. OR (ORI) command: single device connects to a device or a block.

OR command OR command OR command

The structures of ORP and ORF are the same but the action is in rising-edge or falling-edge.