21.
21 -
4
MAINTENANCE AND INSPECTION
21.3 Battery Replacement
Special relay SM51 or SM52 is turned ON when voltage of the battery for backing up
programs and power failure compensation function drops. Even though programs and
contents of power failure compensation function are not erased immediately when these
special relays become ON, the contents could be erased if the ON-status of the special
relay fails to be recognized. Replace the battery before the total latch time after special
relay SM51 turns ON reaches the stipulated time.
SM51 and SM52 will turn ON if there is a voltage drop in the battery of any of the following:
the built-in RAM, memory card A, or memory card B.
In order to determine which of these memory's battery has sustained the voltage drop,
check the contents of special relay SD51 and SD52.
When the voltage of any memory's battery drops, the bit in SD51 and SD52 that
corresponds to each memory turns ON.
POINT
SM51 is a battery voltage drop alarm, and it remains ON once turning it ON even if
the battery voltage returns to normal.
SM52 is a battery voltage drop alarm, and after turning ON, it goes OFF when the
battery voltage returns to normal.
After SM51 and SM52 have turned ON, immediately replace the battery.
SD51, SD52 bit No.
Corresponding memory
Bit 0
Built-in RAM
Bit 1, 2
Memory card A
Bit 3, 4
Memory card B
Содержание Q2ACPU
Страница 1: ......
Страница 2: ......
Страница 221: ...12 12 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Страница 222: ...12 13 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Страница 237: ...12 28 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU MEMO ...
Страница 269: ...16 11 16 POWER SUPPLY MODULE 2 Names and description of parts of the A62P A62PEU and A65P module ...
Страница 271: ...16 13 16 POWER SUPPLY MODULE 4 Names and description of parts of the A66P ...
Страница 343: ...21 21 13 MAINTENANCE AND INSPECTION 21 4 2 Replacement of the fuse for an output module ...
Страница 357: ...22 12 22 TROUBLESHOOTING ...
Страница 359: ...22 14 22 TROUBLESHOOTING MEMO ...
Страница 417: ...App 20 APPENDICES 3 Shift instructions Classification Symbol Description n bit shift 1 bit shift 1 word shift ...
Страница 429: ...App 32 APPENDICES Trigonometric function Classification Symbol Description ...
Страница 432: ...App 35 APPENDICES 15 Clock instructions Classification Symbol Description Clock data read write ...
Страница 537: ...App 140 APPENDICES REMARK 1 Message 1 An error code is displayed in 2 Alert 1 3 Alert 2 ...
Страница 538: ...App 141 APPENDICES APPENDIX 6 EXTERNAL DIMENSIONS Appendix 6 1 CPU Module 1 Q3ACPU Q4ACPU modules Unit mm inch ...
Страница 539: ...App 142 APPENDICES 2 Q2ACPU Q2ACPU S1 modules Unit mm inch ...
Страница 541: ...App 144 APPENDICES 2 A66P power supply module Unit mm inch ...
Страница 542: ...App 145 APPENDICES Appendix 6 3 Main Base Unit 1 A32B base unit 2 A32B S1 base unit Unit mm inch Unit mm inch ...
Страница 543: ...App 146 APPENDICES 3 A35B base unit 4 A38B A38HB A38HBEU base unit Unit mm inch Unit mm inch ...
Страница 567: ...MEMO ...
Страница 569: ......
Страница 570: ......