Bfm#197: Selection Of Cyclic Data Update Function (Function For Data History; Bfm#198: Data History Sampling Time Setting - Mitsubishi Electric FX3G User Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U
FX -4AD/FX -4AD (4-channel Analog Input)
3U 3UC

5.4.26 BFM#197: Selection of cyclic data update function (function for data history)

Use this function to update the data history in BFM#200 to #6999.
Channel numbers are respectively assigned to the 4 lower bits of BFM#197. Turn each bit on or off to select
the data history update function.
ON: If a bit is turned on, the corresponding data will be stored in the buffer memories in the order of the
smallest BFM number to the largest BFM number, but when 1,700 points of data are stored, data will be
then overwritten in the buffer memories starting from the smallest BFM numbers.
OFF: If a bit is turned off, the corresponding data will be stored in the buffer memories in the order of the
smallest BFM number to the largest BFM number, but when 1,700 points of data are stored, data
storage will stop.
1. Channel number assignment to each bit of BFM#197
Bit No.
b0 Selection of channel-1 data update function
b1 Selection of channel-2 data update function
b2 Selection of channel-3 data update function
b3 Selection of channel-4 data update function
b4 to b15 Not used.

5.4.27 BFM#198: Data history sampling time setting

Use this function to set the data history sampling time.
If one of the channels uses the digital filter function, set a multiple of 5.
1. Sampling cycle
As shown in the following table, the sampling cycle depends on whether the digital filter function is used.
Whether digital filter function is used
None of the channels use the digital filter
function.
One or more channels use the digital filter
function.
*1. Only multiples of 5 are valid.
(If any value from 10 to 14 is set, the sampling cycle will be 10 ms. If any value from 15 to 19 is set, the
sampling cycle will be 15 ms.)
2. Caution regarding use of data history function
If the averaging time is set, the data history function cannot be used.
3. Caution regarding EEPROM writing
If data is written to BFM#0, #19, #21, #22, #125 to #129, or #198, the data will also be written to the 4AD
EEPROM.
→ For a detailed description of cautions regarding EEPROM writing, refer to Subsection 5.4.1.
B-46
PLC User's Manual - Analog Control Edition
3UC
Description History data stored in
BFM#200 to #1899, 1,700 points
BFM#1900 to #3599, 1,700 points
BFM#3600 to #5299, 1,700 points
BFM#5300 to #6999, 1,700 points
Value set in
BFM#198
0.5 ms × number of selected channels (number of
0
channels using the digital filter function)
Set value (ms) in BFM#198 × number of selected
1 or more channels (number of channels using the digital filter
function)
5 ms × number of selected channels (number of
9 or less
channels using the digital filter function)
Set value (ms)
10 or more
channels (number of channels using the digital filter
function)
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
Initial value: H0000
Numeric data type: Hexadecimal (H)
-
Setting range: 0 to 30000
Initial value (at delivery) : K15000
Numeric data type: Decimal (K)
Sampling cycle
*1
in BFM#198 × number of selected