Mitsubishi MELSEC iQ-F, User Manual

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APPX
Appendix 4 Buffer Memory Areas
CH1 Input type/Range monitor (Offset/gain setting)
Offset/gain values, which are set in ‘CH1 Input type/range setting’ (Un\G598), can be checked.
■
Buffer memory address
The following shows the buffer memory address of this area.
CH1 Head pointer
The buffer memory address of the oldest data in CH1 Logging data (Un\G10000 to Un\G19999) can be checked with this
buffer memory area.
The offset value at the start address of CH1 Logging data (Un\G10000 to Un\G19999) is stored.
■ Buffer memory address
The following shows the buffer memory address of this area.
Ex.
When the value of 'CH2 Head pointer' (Un\G634) is 20550
• The value in 'CH1 Head pointer' (Un\G434) is fixed to 0 since the oldest data is stored in the start address of
CH1 Logging data (Un\G10000 to Un\G19999) while the data of the first 10000 points is being logged from
beginning of the logging. On and after the 10001st data, 'CH1 Head pointer' (Un\G434) increases one by
one each time data is stored.
• When 'CH1 Logging hold request' (Un\G471) is turned on → off, 'CH1 Head pointer' (Un\G434) is cleared to
0.
Monitor value Description
0 Factory default setting
1 User range setting
Buffer memory name CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
CH  Input type/Range monitor (Offset/gain setting) 431 631 831 1031 1231 1431 1631 1831
CH  Input type/Range monitor (Offset/gain setting) (In FX2N
allocation mode function)
1041 1042 1043 1044 1045 1046 1047 1048
Buffer memory name CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
CH  Head pointer 434 634 834 1034 1234 1434 1634 1834
CH

Head pointer (in FX2N allocation mode function) 9031 9032 9033 9034 9035 9036 9037 9038
20550 = 20000 + 550
CH2 Logging data
Head pointer: 550
(offset value from Un\G20000)
Un\G20000
Un\G20549
Un\G20550
Un\G29999
The oldest data
The latest data