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Chapter 3 PLC Basic Instructions
Basic instructions are used for editing sequential programs and executing 1-bit operation. There are basic instructions
for GSK980TD PLC as follows:
Instruction
name
Function
Component
LD
Read normally-open contact
X, Y, F, G, R, K, A
LDI
Read normally-closed contact
X, Y, F, G, R, K, A
OUT
Output coil
Y, G, R, K, A
AND
Normally-open contact in series
X, Y, F, G, R, K, A
ANI
Normally-closed contact in series
X, Y, F, G, R, K, A
OR
Parallel normally-open contact
X, Y, F, G, R, K, A
ORI
Parallel normally-closed contact
X, Y, F, G, R, K, A
ORB
Parallel series circuit block
ANB
Parallel circuit block in series
3.1 LD，LDI，OUT INSTRUCTION
● Mnemonic code and function
Mnemonic code
Function
LD
Read normally-open contact
LDI
Read normally-closed contact
OUT
Output coil
Ladder symbol
● Instruction explanation
A: LD, LDI are used for connecting contact to bus bar. Each one can combine with instruction ANB and can be
used at starting point of branch.
B: OUT is used for driving output relay, internal relay coil instead of input relay.
C: Parallel instruction OUT can be continuously used.
● Programming example
Program explanation：
When X0002.1 is 1, the system outputs Y0003.7
When F0100.3 is 0, the system outputs G0120.0
Ⅲ-1
Book 1 Programming
Chapter 3 PLC BASIC INSTRUCTIONS