21.
21 -
15
MAINTENANCE AND INSPECTION
21.6 When a PLC is Reoperated After Stored with the Battery Over the Battery Life
If a battery exceeded its guaranteed life is stored and reoperated, the memory contents of
CPU module and memory card may be undefined.
Therefore, when resuming the operation, clear the CPU module memory and format the
memory in the CPU module by peripheral device.
Afeter doing so, write the memory contents backed up before saving to each memory.
The relationship between the backed-up memory and the batteries is explained below.
:
Battery is backed up.
: Battey is not backed up.
*As for device memory, also clear the latch range.
Before resuming the operation, clear/format the memory for which a battery is backed up
in the table above with a peripheral device.
For memory clear/format operations, refer to the following manuals.
• Type SW
IVD-GPPQ GPP Software package Operating Manual (Online)
• GX Developer Operating Manual
Memory
Battery
A6BAT installed in a CPU module
Battery incorporates a memory card
CPU module
Built-in RAM
Device*
Memory card
SRAM type
SRAM + E2PROM
type
SRAM
E
2
PROM
– (Battery back up is not required.)
POINT
(1) Make sure to back up each memory contents before storing a PLC.
(2) When a PLC power supply is ON or CPU module reset is cancelled, a CPU
module reviews the status of data below, and initializes all the data if detecting
an error.
RAM data in built-in RAM
Breakdown history
Latch data (Latch relay (L), latch setting range device set in a parameter),
special relay SM900 to SM999, special register SD900 to SD999)
Sampling trace data
Summary of Contents for Q2ACPU
Page 1: ......
Page 2: ......
Page 221: ...12 12 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Page 222: ...12 13 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Page 237: ...12 28 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU MEMO ...
Page 271: ...16 13 16 POWER SUPPLY MODULE 4 Names and description of parts of the A66P ...
Page 343: ...21 21 13 MAINTENANCE AND INSPECTION 21 4 2 Replacement of the fuse for an output module ...
Page 357: ...22 12 22 TROUBLESHOOTING ...
Page 359: ...22 14 22 TROUBLESHOOTING MEMO ...
Page 429: ...App 32 APPENDICES Trigonometric function Classification Symbol Description ...
Page 537: ...App 140 APPENDICES REMARK 1 Message 1 An error code is displayed in 2 Alert 1 3 Alert 2 ...
Page 539: ...App 142 APPENDICES 2 Q2ACPU Q2ACPU S1 modules Unit mm inch ...
Page 541: ...App 144 APPENDICES 2 A66P power supply module Unit mm inch ...
Page 543: ...App 146 APPENDICES 3 A35B base unit 4 A38B A38HB A38HBEU base unit Unit mm inch Unit mm inch ...
Page 567: ...MEMO ...
Page 569: ......
Page 570: ......