Ghisalba VFD-E Series - Page 221

Appendix D How to Use PLC Function
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VFD-E Series
D-8 Revision August 2006, 01EE, SW--PW V1.03/CTL V2.03
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.
X0
OFF
ON
OFF
Time
Falling-edge
X0
OFF
ON
OFF
Time
Rising-edge
2. AND (ANI) command: single device connects to a device or a block in series.
AND comman
d
AND comman
d
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.
4. ANB command: a block connects to a device or a block in series.