9 STEP LADDER INSTRUCTIONS
9.1 Starts/Ends Step Ladder
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9
STEP LADDER INSTRUCTIONS
9.1
Starts/Ends Step Ladder
STL, RETSTL
STL: This instruction starts step ladder.
RETSTL: This instruction ends step ladder.
Setting data
■
Descriptions, ranges, and data types
■
Applicable devices
*1 Only S can be used.
Processing details
• In programs using step ladder instructions, a step relay S is assigned to each process based on machine operations, and
sequences of input condition and output control are programmed as circuits connected to contacts (STL contacts) of state
relays.
• In a step ladder program, a step relay S is regarded as one control process, and a sequence of input conditions and output
controls are programmed in a state relay. Because the preceding process is stopped when the program execution proceeds
to the next process, a machine can be controlled using simple sequences for each process.
• The step relay number specified by STL instruction is assigned to the State. The start and completion of the State use SET
instruction, RST instruction, and ZRST instruction.
• Program a step ladder program starting from the initial state relay in the order of state relay ON status transfer. Make sure
to put the RETSTL instruction at the end of a step ladder program. The RETSTL instruction is omissible anywhere other
than the last Step Ladder.
Ladder diagram
Structured text
(1): Step ladder program
Not supported.
FBD/LD
Not supported.
Operand
Description
Range
Data type
Data type (label)
(d)
The step relay number which assigns the State
0 to 4096
Bit
ANY_BOOL
Operand
Bit
Word
Double word Indirect
specification
Constant
Others
X, Y, M, L, SM,
F, B, SB, S
T, ST, C, D, W,
SD, SW, R
U
\G
Z
LC
LZ
K, H
E
$
(d)
STL
RETSTL
(d)
(1)
Summary of Contents for MELSEC iQ-F FX5
Page 1: ...MELSEC iQ F FX5 Programming Manual Instructions Standard Functions Function Blocks ...
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Page 1050: ...1048 26 TIME DATA FUNCTIONS 26 4 Division MEMO ...
Page 1068: ...1066 29 COUNTER FUNCTION BLOCKS 29 4 Counter Function Block Operation error There is no error ...
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