9.
9 -
14
MAINTENANCE FUNCTION
9.7
Online I/O Module Replacement
When an I/O module is installed or removed while the QnACPU power is ON, "UNIT
VERIFY ERROR" appears, and PLC CPU operation stops or control is kept with I/O
numbers that are different from the set numbers.
Replacing the I/O module during online is the replacement method that replaces the I/O
module without "UNIT VERIFY ERROR" while the PLC CPU power is ON.
(1) Application
Replacing I/O modules during online is used to replace an I/O module at which an
error has occurred while continuing control by the sequence program.
(2) Replacement method
The following two methods can be used to replace an I/O module during online.
(a) Use "Connect Unit" in the PLC menu in the GPP function PLC diagnostics mode.
(b) Use special relays/special registers.
(3) Procedure when using GPP function
(a) Designate the I/O module to be replaced with "Connect Unit" of the PLC menu in
the PLC diagnostics mode.
(b) Replace the designated I/O module.
CAUTION
Basically, replace I/O modules after turning off the power supply.
When replacing I/O modules during online using the function in this section, perform
it according to the user system specification.
POINT
Replaceing I/O modules during online is possible only for I/O module.
This is not applied to special function modules.
Fig. 9.2 Replacing input modules during online
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: ......