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CHAPTER 2 APPLICATION OF PROGRAMMING
2
2.7 Data Clear Processing
(4) Clearing latch data
(a) Data in the latch clear operation enable range (Latch (1) Start/End)
Perform either of the following.
• Remote latch clear
Perform the operation using a programming tool. ( Page 137, Section 3.6.4)
• Latch clear by using the special relay and special register areas Note 2.2
(b) Data in the latch clear operation disable range (Latch (2) Start/End) and in the file
register
Perform any of the following.
• Reset data by using the RST instruction.
• Transfer K0 by using the MOV or FMOV instruction. ( MELSEC-Q/L Programming Manual (Common
Instruction))
• Set parameters ("Clear Device's whole Memory" or "Clear all File Registers").
[Online] [PLC Memory Operation] [Clear PLC Memory] "Clear Device's whole
Memory"/"Clear all File Registers"
Latching device data increases the scan time. When latching device data, consider the increase in scan time.
( Page 477, Appendix 3.2 (6))
1. Change the operating status of the CPU module to STOP.
2. Set "5A01
H
" in SD339.
3. Turn on SM339.
Note 2.2
Only the High-speed Universal model QCPU and Universal model Process CPU support latch clear operation by using
the special relay and special register areas. Before executing the function, check the version of the CPU module used.
( Page 465, Appendix 2)
Universal
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