Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 64

When 'Operating condition setting request' (Un\G70, b9) is turned offonoff on the condition that the
logging cycle determined by 'CH1 Logging cycle setting value' (Un\G537) and 'CH1 Logging cycle unit setting'
(Un\G538) is shorter than the conversion cycle, an error occurs and logging does not start. A logging cycle
setting disable error (error code: 1D2H) is stored in 'Latest error code' (Un\G0), 'Error flag' (Un\G69, b15)
and the ERROR LED turn on.
■Number of logging data
With 'CH1 Number of logging data' (Un\G436), the number of valid data in 'CH1 Logging data' (Un\G10000 to Un\G19999)
can be checked.
When the number of collected data points is less than 10000
Address 0
Address 1
Address 2
Address 3
Address 4
Address 5
Address 9998
Address 9999
The number of logging data increases by one each time new data is stored.
When CH1 Logging data (Un\G10000 to Un\G19999) becomes full (Number of logging data = 10000), the next data is stored
in the head address of CH1 Logging data (Un\G10000 to Un\G19999), and the logging operation continues overwriting the
existing data. In this case, the number of logging data is fixed to 10000.
■Head pointer and latest pointer
The storage location of the oldest data and the latest data in CH1 Logging data (Un\G10000 to Un\G19999) can be checked
with the following buffer memory areas.
Buffer Memory Areas
CH1 Head pointer (Un\G434)
CH1 Latest pointer (Un\G435)
When the number of collected data points is less than 10000
CH Head pointer
= 0
CH Latest pointer
= 4
The head pointer does not change (fixed to 0) until CH1 Logging data (Un\G10000 to Un\G19999) becomes full after the
logging start. (fixed to 0).
The head pointer moves by one point when CH1 Logging data (Un\G10000 to Un\G19999) becomes full and overwriting the
data starts from the head address.
1 FX5-4AD
62
1.4 Functions
Valid data
CH Logging data points = 5
Invalid data
(Data stored in these areas are not reliable.)
Description
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 (0 to 9999) counted from the start address of CH1 Logging data
(Un\G10000 to Un\G19999) is stored.
The buffer memory address of the latest data in CH1 Logging data (Un\G10000 to Un\G19999) can be checked
with this buffer memory area. The offset value (0 to 9999) counted from the start address of CH1 Logging data
(Un\G10000 to Un\G19999) is stored.
Address 0 Oldest
Address 1
Address 2
Address 3
Address 4
Latest
Address 5
Address 9998
Address 9999
When the number of collected data points is 10001 or greater
Address 0
Address 1
Valid data
Address 2
Address 3
CH Logging data points = 10000
Address 4
Address 5
Address 9998
Address 9999
When the number of collected data points is 10001 or greater
CH Latest pointer
= 4
CH Head pointer
= 5
Address 0
Address 1
Address 2
Address 3
Latest
Address 4
Address 5
Oldest
Address 9998
Address 9999