14 - 8
Chapter 14 Common Functions
[3] Precautions during control
(1) Data can only be written to the flash ROM when the positioning control is not
carried out (when the PLC READY signal [Y0] is OFF).
The warning "In PLC READY" (warning code: 111) will occur if executed
when the PLC READY signal [Y0] is ON.
(2) Writing to the flash ROM can be executed up to 100,000 times.
If writing to the flash ROM exceeds 100,000 times, the writing may become
impossible, and the error "Flash ROM writing error" (error code: 801) will
occur.
(3) After one power ON/PLC CPU reset operation, writing to the flash ROM
using a sequence program is limited to up to 25 times.
If the 26th writing is executed, the error "Flash ROM write number error"
(error code: 805) will occur. If this error occurs, carry out the error reset or
power OFF ON/PLC CPU reset operation again.
Refer to "
Md.19
Number of write accesses to flash ROM
" of Section 5.1.9
"Types and roles of monitor data" for details.
Important
Do not turn the power ON/OFF or reset the PLC CPU during executing the flash
ROM writing. If the power is turned OFF or the PLC CPU module is reset to forcibly
end the process, the data backed up in the flash ROM/internal memory
(nonvolatile) will be lost.
[4] Execution data backup method
(1) Execution data backup (writing to the flash ROM/internal memory
(nonvolatile)) is carried out using the dedicated instruction "ZP.PFWRT".
(Refer to Chapter 15 "Dedicated Instructions" for details.)
(2) Refer to Section 7.2 "Data transmission process" for the data transmission
processing at the backup of the execution data.
(3) Execution data backup can also be carried out by the writing of the data
shown in the table below to the buffer memory of Simple Motion module
using the TO command/intelligent function device.
The writing to the flash ROM/internal memory (nonvolatile) is executed at the
time point the data is written to the buffer memory of Simple Motion module.
Setting item
Setting
value
Setting details
Buffer memory address
LD77MS2
LD77MS4
LD77MS16
Cd.1
Flash ROM write
request
1
Set "1: Requests write access to flash ROM.".
1900
5900
: Refer to Section 5.7 "List of control data" for details on the setting details.
When the writing to the flash ROM/internal memory (nonvolatile) is complete, "0"
will be set in "
Cd.1
Flash ROM write request
" by the Simple Motion module
automatically.
Summary of Contents for MELSEC-L Series
Page 2: ......
Page 30: ...MEMO ...
Page 70: ...2 10 Chapter 2 System Configuration MEMO ...
Page 83: ...3 13 Chapter 3 Specifications and Functions MEMO ...
Page 103: ...3 33 Chapter 3 Specifications and Functions MEMO ...
Page 107: ...3 37 Chapter 3 Specifications and Functions MEMO ...
Page 111: ...3 41 Chapter 3 Specifications and Functions MEMO ...
Page 115: ...3 45 Chapter 3 Specifications and Functions MEMO ...
Page 140: ...4 22 Chapter 4 Installation Wiring and Maintenance of the Product MEMO ...
Page 253: ...5 113 Chapter 5 Data Used for Positioning Control MEMO ...
Page 342: ...5 202 Chapter 5 Data Used for Positioning Control MEMO ...
Page 438: ...7 20 Chapter 7 Memory Configuration and Data Process MEMO ...
Page 440: ...MEMO ...
Page 485: ...9 25 Chapter 9 Major Positioning Control MEMO ...
Page 594: ...9 134 Chapter 9 Major Positioning Control MEMO ...
Page 624: ...10 30 Chapter 10 High Level Positioning Control MEMO ...
Page 656: ...11 32 Chapter 11 Manual Control MEMO ...
Page 690: ...12 34 Chapter 12 Expansion Control MEMO ...
Page 798: ...13 108 Chapter 13 Control Sub Functions MEMO ...
Page 866: ...14 68 Chapter 14 Common Functions MEMO ...
Page 884: ...15 18 Chapter 15 Dedicated Instructions MEMO ...
Page 899: ...16 15 Chapter 16 Troubleshooting MEMO ...
Page 1036: ...Appendix 88 Appendices MEMO ...
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