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Analog Input Functions Section 7-9
Once the sampling of analog input values starts, the number of values speci-
fied with the circular value (up to 32,767 samples) are stored in the DM Area
beginning at the specified DM address. The sampling operation will be com-
pleted when the specified number of samples are all stored in the DM Area.
Example
Application Example Creating Displacement Data from a Particular Workpiece Position
In this example, operation is synchronized to the measurement position of a
workpiece (such as a sheet of glass) and the Motion Control Module collects
displacement data from an analog output sensor. Displacement is measured
at several measurement points.
1,2,3... 1. When the workpiece has reached the measurement point, the CTBL(882)
instruction is executed and an interrupt will be generated for the
high-speed counter PV (linear counter).
2. Another CTBL(882) instruction (using the CTBL(882) instruction’s
high-speed analog sampling function) is executed in that interrupt task.
When the High-speed counter PV (circular counter) reaches the preset val-
ue, the Motion Control Module collects the specified number of high-speed
analog input data samples from a displacement sensor.
S Target value 8-digit hex
S+1
S+2 First word of data sample storage area
(DM Area address)
0000 to 7FFF hex
S+3 Number of data samples 0000 to 7FFF hex
CTBL
P
M
S
P: Port specifier (#0003)
M: Register target value comparison table and start comparison.
S: Target value comparison table
CTBL(882) with High-speed Analog Sampling Function
CTBL
#3
#0
D00000
D00000 0000 hex
D00001 0000 hex
D00002 00C8 hex (200 decimal)
D00003 0064 hex (100 decimal)
0000 0000 hex
D00200
D00201
D00202
D00299
0000 0000 hex
Sampling counter: #3
Register target value comparison table and start comparison.
Start of comparison table
Target value (rightmost 4 digits)
Target value (leftmost 4 digits)
Data sample storage area
Number of data samples
FQM1-MMA21 Motion Control Module (for Analog Inputs)
Pulse input
Analog input
Counter PV
Sampling counter
High-speed counter 1
Start sampling
Target
value
Sample storage area
Comparison Table