Chapter 6: Instructions 59
A
B
()
()
Basic Instruction Details
Instruction
Mnemonic Start of the Circuit Range
■ Bit
Byte
STR
STN
Start rung with NO contact
Start rung with NC contact
Word
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: R015.2, R015.3
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 R015.2
(OUT)
R000.3 R015.3
(OUT)
R000.1
M000.1
R000.1
M000.1
M000.2
R000.0 M000.0
(OUT)
R000.1 M000.1
(OUT)
M000.2
(OUT)
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