9 STEP LADDER INSTRUCTIONS
9.1 Starts/Ends Step Ladder
737
9
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Operation of program
The step ladder program operates as follows.
*1 It is always necessary to program to drive an output.
*2 Output coils can be used again in different state relays.
*3 Each OUT and SET instruction for step relays automatically resets the transfer source, and has the self-holding function.
*4 One step relay number can only be used once.
*5 It is not possible to place a pointer immediately after the STL instruction. If a pointer is placed, a program error (33E2H) occurs.
When the step relay is latched, the ON/OFF status is backed up by nonvolatile memory against power failure.
Use this type of state relay if the operation should be restarted from the last point before power failure. These
relays hold the operation status also at the time of RUN to STOP. If it RUN(s) again, the operation will be
resumed from the State before STOP.
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Related devices
Precautions
When the step relay is not latched, step relay clears at power supply ON
OFF or RUN
STOP. If the State is valid and power
supply ON
OFF or PLC RUN
STOP, operation can not be restarted from the last point before power-supply ON
OFF or
RUN
STOP.
Operation error
There is no operation error.
Device
Name
Remarks
SM8040
STL transfer disable
When SM8040 is set to ON, transfer of the ON status is disabled among all state relays.
SM8046
STL state ON
When the step relay turns on, SM8046 turns on automatically.
SM8047
Enable STL monitoring
When SM8047 is turned on, it stores in SD8040 to SD8047 sequentially from the young number of
the step relay which operates in the step relay.
SD8040 to SD8047
ON step relay numbers
The turned-on step relay number is stored in SD8040 to SD8047 (Max. 8 points) sequentially from
the smaller number.
STL
S31
Y30
X1
SET
Y31
SET
S32
Y30
Y32
X2
*2
*2
*1
*5
STL
S32
STL
S31
Y30
X1
SET
Y31
SET
S32
Y30
Y32
X2
STL
S32
S33
SM400
SM400
SM400
*1
*1
*3
*3
*4
SET
S31
SET
S31
S33
SM402
SM402
SM400
SM400
SM400
Process of S32
Process of S31
Activated
When X1 turns ON, S32
turns ON and S31 is
automatically reset.
Y31 programmed in the
SET instruction remains
ON even if S31 is reset.
Содержание MELSEC iQ-F FX5
Страница 1: ...MELSEC iQ F FX5 Programming Manual Instructions Standard Functions Function Blocks ...
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Страница 17: ...15 CONTENTS ...
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Страница 25: ...23 PART 1 PART 1 OVERVIEW Part 1 consists of the following chapter 1 OVERVIEW 2 PRECAUTIONS ON PROGRAMMING ...
Страница 126: ...124 6 SEQUENCE INSTRUCTIONS 6 3 Output Instructions Operation error There is no operation error ...
Страница 132: ...130 6 SEQUENCE INSTRUCTIONS 6 3 Output Instructions Operation error There is no operation error ...
Страница 140: ...138 6 SEQUENCE INSTRUCTIONS 6 3 Output Instructions Operation error There is no operation error ...
Страница 191: ...7 BASIC INSTRUCTIONS 7 2 Arithmetic Operation Instructions 189 7 Operation error There is no operation error ...
Страница 202: ...200 7 BASIC INSTRUCTIONS 7 2 Arithmetic Operation Instructions Operation error There is no operation error ...
Страница 278: ...276 7 BASIC INSTRUCTIONS 7 4 Bit Processing Instructions Operation error There is no operation error ...
Страница 280: ...278 7 BASIC INSTRUCTIONS 7 4 Bit Processing Instructions Operation error There is no operation error ...
Страница 915: ...18 TYPE CONVERSION FUNCTIONS 18 13 Converting DWORD to WORD 913 18 Operation error There is no operation error ...
Страница 917: ...18 TYPE CONVERSION FUNCTIONS 18 14 Converting DWORD to INT 915 18 Operation error There is no operation error ...
Страница 932: ...930 18 TYPE CONVERSION FUNCTIONS 18 26 Converting DINT to WORD Operation error There is no operation error ...
Страница 1050: ...1048 26 TIME DATA FUNCTIONS 26 4 Division MEMO ...
Страница 1068: ...1066 29 COUNTER FUNCTION BLOCKS 29 4 Counter Function Block Operation error There is no error ...
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