Filter
Top Products
223
Analog Input Functions Section 7-9
Signal Range: 1 to 5 V and 4 to 20 mA
Signal Range: 0 to 5 V
7-9-7 High-speed Analog Sampling (FQM1-MMA21 Only)
Overview When an FQM1-MMA21 Motion Control Module is being used, the Motion
Control Module can be synchronized with pulse inputs from the encoder to
collect analog data.
This sampling method checks measurements in synchronization with the
position, an operation which could not be performed with scheduled interrupts
in earlier controllers.
When the CTBL(882) instruction is used as a high-speed analog sampling
function, the Motion Control Module can start sampling analog input data at
high speed when a preset counter PV is reached, and store the specified
number of samples automatically in the DM Area.
This function can be used with high-speed counter 1 only.
CTBL(882) Instruction
Operation
The CTBL(882) instruction starts a specified interrupt task when the
high-speed counter PV of pulse input 1 matches a specified target value.
If the CTBL(882) instruction is executed in the interrupt task to perform
high-speed analog sampling, the Motion Control Module will sample analog
values at the interval (circular counter size) specified by the CTBL(882)
instruction.
1068
0000
FF38
+5.0 V
+5.2 V
0FA0
Analog input (V)
+1.0 V
+0.8 V
Stored value
(4-digit Hexadecimal)
Resolution of 1/4,000
+20.8 mA
+20.0 mA
+4.0 mA
+3.2 mA
Analog input (mA)
1068
0000
FF38
+5.00 V
+5.25 V
0FA0
Analog input (V)
0 V
−0.25 V
Stored value
(4-digit Hexadecimal)
Resolution of 1/4,000