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21. MAINTENANCE AND INSPECTION

WARNING

Be sure to shut off all phases of the external power supply used by the system

before cleaning or retightening the terminal screws or module mounting screws.

Failure to do so may result in an electric shock.

If they are too loose, it may cause a short circuit or malfunctions.

If too tight, it may cause damage to the screws and/or module, resulting in an

accidental drop of the module, short circuit or malfunctions.

Default Chapter12
- Table of Contents12
1 ABOUT this MANUAL 1 - 1 to22
- About this Manual22
- Abbreviations and Generic Terms Used in this Manual23
2 Overview24
- Features24
- Additional Functions of Qnacpu28
  - Overview of Added Functions30
3 SYSTEM CONFIGURATION 3 - 1 to32
- System Configuration32
  - Equipment Configuration in a Stand-Alone System32
  - Configuration of Peripheral Devices Capable of Qnacpu33
- System Configuration Overview34
- System Equipment37
4 Performance Specifications57
5 I/O Number Assignment60
- I/O Numbers60
- I/O Number Assignment Concept61
- I/O Assignment with GPP Function63
- Example of I/O Number Assignment68
6 DATA COMMUNICATIONS with SPECIAL FUNCTION MODULES 6 - 1 to74
- Reading/Writing Data From/To the Qnacpu Using the FROM/TO Instruction75
- Reading/Writing Data From/To the Qnacpu Using Special Direct Devices76
- Processing for Data Communication Requests from a Special Function Module78
7 Auto Refresh Function79
- For MELSECNET/MINI-S379
- Auto Refresh Setting of CC-Link86
8 Debugging Function93
- Function List93
- Monitor Function94
  - Monitoring Condition Setting94
  - Monitor Test of Local Device (Function Version B or Later)104
- Write During RUN107
- Execution Time Measurement111
- Sampling Trace Function117
- Status Latch Function127
- Step Operation133
- Program Trace Function140
- Simulation Function149
- Debugging by Several People153
  - Simultaneous Monitoring by Several People154
  - Simultaneous Execution of Write During RUN by Several People155
9 Maintenance Function157
- Function List157
- Watchdog Timer158
- Self-Diagnostics Function160
- Error History166
- System Protect167
- Password Registration168
- Online I/O Module Replacement170
- System Display172
- LED Indications173
  - LED Indication173
  - Priority Setting175
10 Other Functions178
- Function List178
- Constant Scan179
- Latch Function182
- Setting of the Output (Y) Status When Switching from STOP to RUN184
- Clock Function185
- Remote Operation190
- Terminal Operation198
  - Operation for Message Display198
  - Key Input Operation199
- Reading Module Access Time Intervals200
11 COMMENTS that CAN be STORED in Qnacpu202
- Function List202
- PLC Name203
- Drive Title204
- File Title205
- Device Comment206
- Statements/Notes208
- Initial Device Value Comment209
12 OVERVIEW of PROCESSING PERFORMED by the Qnacpu 12 - 1 to210
- Program Execution Types210
- Operation Processing of RUN, STOP, PAUSE, and STEP-RUN233
- Operation Processing for Instantaneous Power Failure235
- Data Clear Processing236
13 Parameter List238
14 Selecting Memory Card Models249
- Applications of Memory Cards249
- Selecting Memory Card Capacity250
15 Hardware Specifications of Cpu Modules252
- Specifications252
- Part Names253
- Relationship between Switch Operations and Leds/Led Display256
16 Power Supply Module259
- Specifications259
- Handling Precautions266
- Part Names268
17 Base Unit and Extension Cable273
- Specifications of Base Units273
  - Main Base Unit for High-Speed Access (A38HB/A38HBEU)275
- Extension Cable Specifications276
- Application Standards of Extension Base Units (A52B, A55B, A58B)277
- Handling Precautions279
- Part Names280
- Setting of Extension Stage Numbers283
18 Memory Cards and Batteries284
- Memory Card Specifications284
- Handling Memory Cards286
- Battery Specifications (CPU Module and Memory Card Batteries)287
- Handling Precautions288
- Part Names of Memory Card289
- Installing Batteries (CPU Module and Memory Card Batteries)290
- Installing/Removing a Memory Card291
19 Loading and Installation293
- Fail-Safe Circuit Concept293
- Installation Environment299
- Calculation of Heat Generated by the PLC300
- Installing the Base Units302
  - Installation Precautions302
  - Installation303
- Installation and Removal of Modules304
- Installation and Removal of the Dustproof Cover307
- Wiring309
  - Wiring Instructions309
  - Wiring to Module Terminals314
- Precautions When Connecting Uninterruptible Power Supply Module (UPS)316
20 Emc and Low Voltage Directives317
- Requirements for Compliance with EMC Directives317
- Requirements for Compliance with Low Voltage Directives327
21 Maintenance and Inspection331
- Daily Inspection331
- Periodic Inspection332
- Battery Replacement334
  - Battery Life336
  - Battery Replacement Procedure338
- Fuse Replacement342
  - Replacement of the Fuse for a Power Supply Module342
  - Replacement of the Fuse for an Output Module343
- When Reoperating a PLC after Storing It with a Battery Unconnected344
- When a PLC Is Reoperated after Stored with the Battery over the Battery Life345
22 Troubleshooting346
- Fundamentals of Troubleshooting346
- Error Code List360
- Resetting Errors391
- Fault Examples with I/O Modules392
  - Faults with the Input Circuit and the Corrective Actions392
  - Faults in the Output Circuit394
Appendices398
Appendix 1 Instruction List398
- Appendix 1.1 Sequence Instructions398
- Appendix 1.2 Basic Instructions402
- Appendix 1.3 Application Instructions414
- Appendix 1.4 Data Link Instructions435
- Appendix 1.5 PID Control Instructions438
- Appendix 1.6 Special Function Module Instructions439
APPENDIX 2 Special Relay List445
APPENDIX 3 Special Register List469
Appendix507
- Qnacpu507
- Appendix 4.1 Instructions507
- Appendix 4.2 Devices515
- Appendix 4.3 Parameters517
- Appendix 4.4 Timer and Interrupt Counter Operations518
- Appendix 4.5 Sequence Programs, Statements, Notes519
- Appendix 4.6 Microcomputer Programs521
- Appendix 4.7 Comments522
- Appendix 4.8 Constant Scan Function, Error Check Function523
- Appendix 4.9 I/O Control Mode524
- Appendix 4.10 Data Link System525
- Appendix 4.11 Index Register Processing526
- Appendix 4.12 CHK Instruction, IX Instruction527
- Appendix 4.13 Accessing File Register R with Instructions528
Appendix 5.1 Error Codes529
- Error Codes Returned to the Request Source in General Data Processing529
- App529
Appendix 6 External Dimensions538
- Appendix 6.1 CPU Module538
- Appendix 6.2 Power Supply Module540
- Appendix 6.3 Main Base Unit542
- Appendix 6.4 Extension Base Unit544
  - Use of Local Device for Subroutine/Interrupt Program Storage File (Function Version B or Later)546
Appendix 8 Network Relay from Ethernet Module550
- (Function Version B or Later)550
APPENDIX 9 Qnacpu PROCESSING TIME553
- Appendix 9.1 Overview of Qnacpu Scan Time553
- Appendix 9.2 Causes of Increasing Scan Time554
Appendix 10 Transportation Precautions557
- Appendix 10.1 Relevant Models557
- Appendix 10.2 Transportation Guidelines558
APPENDIX 11 Handling of Batteries and Devices with Built-In Batteries in EU Member States559
- Appendix 11.1 Disposal Precautions559
- Appendix 11.2 Exportation Precautions560

Brand	Mitsubishi
Model	Q2ACPU
Category	Controller
Language	English

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