11 TROUBLESHOOTING
Special Relay List (Continued)
Number | Name | Meaning | Explanation | Set by | Corresponding | Applicable |
(When Set) | ACPU | CPU | ||||
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| M9 | ||
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| • Initial value is set at ON or OFF depending on |
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| parameters. |
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| • When this relay is OFF, all execution status are cleared |
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| from time SFC program was stopped; starts from the |
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SM322 | SFC program | OFF: Initial start | initial step of block where the start request was made. | S (Initial) | M9102 |
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| start status | ON : Restart | • When this relay is ON, starts from execution block and | U | format change |
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| execution step active at time SFC program was stopped. |
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| (ON is enabled only when resumptive start has been |
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| designated at parameters.) |
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| • SM902 is not automatically designated for latch. |
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| • When this relay is OFF, transition occurs at one scan/one |
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| Presence/absenc | OFF: Continuous transition | step, for all blocks. |
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| • When this relay is ON, transition occurs continuously for |
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| e of continuous | not effective |
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SM323 | all blocks in one scan. | U | M9103 |
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transition for | ON : Continuous transition |
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| entire block | effective | • In designation of individual blocks, priority is given to the |
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| continuous transition bit of the block. |
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| (Designation is checked when block starts.) |
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| Continuous | OFF: When transition is | • When continuous transition is effective, goes ON when | S |
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| continuous transition is not being executed; goes OFF |
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SM324 | transition | executed | (Instruction | M9104 |
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when continuous transition is being executed. |
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| prevention flag | ON : When no transition | execution) |
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| • Normally ON when continuous transition is not effective. |
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| Output mode at | OFF: OFF | When block stops, selects active step operation output. | S (Initial) |
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SM325 | • All coil outputs go OFF when this relay is OFF. | M9196 |
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block stop | ON : Preserves | U |
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| • Coil outputs are preserved when this relay is ON. |
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| SFC device clear | OFF: Clear device | Selects the device status when the stopped CPU is run |
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SM326 | after the sequence program or SFC program has been | U | New |
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mode | ON : Preserves device |
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| modified when the SFC program exists. |
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| Output during |
| Selects the output action of the step being held when a |
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| OFF: OFF | block is ended by executing the end step. | S (Initial) |
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SM327 | end step | New |
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ON : Preserves | • All coil outputs go OFF when this relay is OFF. | U |
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| execution |
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| • Coil outputs are preserved when this relay is ON. |
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| Operation mode |
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SM330 | for low speed | OFF: Asynchronous mode | Low speed execution type program ON for 1 scan only | U (END) | New |
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| execution type | ON : Synchronous mode | after RUN |
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| program |
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| • Stores the status of the intelligent function module access |
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| When ON, access to the | instruction executed immediately before. |
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| Access execution | (This information will be overwritten when the intelligent | S (Status |
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SM390 | intelligent function module is | New | QCPU | |||
| flag | completed | function module access instruction is executed again.) | change) |
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| • This flag is used by the user in a program as the |
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| completion bit. |
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11 - 46 | 11 - 46 |