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D320 PLC User's Manual
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Basic Instruction Details
Instruction
Mnemonic
Start of the Circuit
Range
■
Bit
Word
STR
STN
Start rung with NO contact
Start rung with NC contact
Double words
Ladder
Used for the start of a circuit.
STR: Start NO (normally open) contact
STN: Start NC (normally closed) contact (STR NOT)
A: Circuit started with NO contact
→
STR
B: Circuit started with NC contact
→
STN
Description
1. Every rung in the ladder program begins with either a STR or STN.
2. Every rung will contain one or more contacts.
3. Every rung will end in one or more output coils or application instructions.
4. When programming a ladder with NO and NC contacts, GPC will automatically use the
proper contact instruction (STR, STN, AND, ANN, OR, ORN).
Start of circuit: R000.2, R000.3
End of circuit: R004.2, R005.2
Example
Program Expression
Time Chart
M000.0 has the same logic as R000.0
M000.1, M000.2 have the opposite logic as R000.1
R000.2
R004.2
(OUT)
R000.3
R005.2
(OUT)
R000.1
M000.1
R000.1
M000.1
M000.2
R000.0
M000.0
(OUT)
R000.1
M000.1
(OUT)
M000.2
(OUT)
Содержание D320 PLC
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