8 APPLICATION INSTRUCTION
8.19 Initial State
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8
• Do not program the following state relays as general state relays;
• If the devices are switched among individual operation (X20), zero return (X21) and automatic operation (X22, 23 and X24)
while the zero return complete device (SM8043) is OFF, all outputs are set to OFF. Automatic operation can be started
again after zero return is completed.
Precautions
• It is not necessary to use all switches for mode selection. When some switches are not used, leave the corresponding
numbers in the unused status. Such numbers cannot be used for any other purpose.
• The IST instruction should be programmed earlier than a series of STL circuit such as state relays S0 to S2.
• Use the state relays S10 to S19 for the zero return operation. In the final state in the zero return operation, set SM8043 to
ON, and then let it be reset to OFF by itself.
• The IST instruction can only be used once in a program.
Device number
Descriptions
ON/OFF condition
S0
Individual operation
initial state
ON condition
when a individual operation mode is selected.
OFF condition
Except a individual operation mode.
S1
Zero return initial state
ON condition
when a zero return operation mode is selected.
OFF condition
Except a zero return operation mode.
S2
Automatic operation
initial state
ON condition
when a automatic operation mode is selected.
OFF condition
Except a automatic operation mode.
Device number
Descriptions
ON/OFF condition
S0 to S9
Occupied for the initial state
• S0 to S2 are used for individual operation, zero
return and automatic operation as shown above.
• S3 to S9 can be used arbitrarily.
ON condition
Turns ON when a step relay (device S) is selected for the
initial state.
OFF condition
Turns OFF when no step relay (device S) is selected.
S10 to S19
Occupied for zero return
ON condition
Turns ON when a step relay (device S) is selected for
return to the zero point.
OFF condition
Turns OFF when no step relay (device S) is selected.
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 1068: ...1066 29 COUNTER FUNCTION BLOCKS 29 4 Counter Function Block Operation error There is no error ...
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