Mitsubishi Melsec FX-4AD User Manual page 6

3.4 Allocation of buffer memories (BFM)
BFM Contents
*# 0 Channel initialization Default = H0000
*# 1 Channel 1 Contains the number of samples (1 to 4096) to
*# 2 Channel 2
be used for an averaged result. The default
setting for normal speed is 8.
*# 3 Channel 3
The default setting for high speed is 1.
*# 4 Channel 4
# 5 Channel 1 These buffer memories contain the averaged
# 6 Channel 2
input values for the number of samples entered
for the channel in buffer memories #1 to #4
# 7 Channel 3
respectively.
# 8 Channel 4
# 9 Channel 1
These buffer memories contain the present
#10 Channel 2
value currently being read by each input
#11 Channel 3
channel.
#12 Channel 4
#13-#14 Reserved
When set to 0, a normal speed is selected of
Selection of A-D
15ms/ch (default)
c o n v e r s i o n
#15
When set to 1, a high speed is selected of
speed see note 2
6ms/ch
#16-#19 Reserved
BFM
*#20 Reset to Defaults and Preset.
*#21 Offset, Gain Adjust Prohibit.
*#22 Offset, Gain Adjust
*#23 Offset Value
*#24 Gain Value
#25-#28 Reserved
#29 Error status
#30 Identification code K2010
#31 Cannot be used
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In buffer memory locations (BFMs) marked
with an "*" data can be written from the PC
using the TO command.
For buffer memories (BFMs) without the "*"
mark, data can be read to the PC using the
FROM command.
Before reading from the analog special
function block, ensure these settings have
been sent to the analog special function
block. Otherwise, the previous values held
in the analog block will be used.
The buffer memory also gives a facility to
b7 b6 b5 b4 b3 b2 b1 b0
adjust offset and gain by software as well
Default=0
as by panel switches of the FX-4AD unit.
Default=(0,1)Permit
(see note 3)
G4 O4 G3 O3 G2 O2 G1 O1
Default=0
Offset (intercept): The analog input value
Default=5,000
when the digital output becomes 0.
Gain (slope): The analog input value when
the digital output becomes +1000.