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Analog Input Functions Section 7-9
7-9-3 Analog Input Function Specifications
Note The following diagram is provided as a reference example. This example
shows the input response (step response) characteristics of an input when the
external input signal is changed in a step pattern. In this case, the input range
is
−10 to +10 V.
Item Specification
Input signals Voltage inputs, current inputs
No. of analog inputs 1 input
Input signal ranges Select one of the following input ranges in the System Setup (Analog Input/Output
Tab Page
− Input Setting): −10 to +10 V, 0 to 10 V, 0 to 5 V, 1 to 5 V, or 4 to 20 mA.
A/D conversion time 40 µs
Input response time 1.5 ms or less (See note.)
Resolution −10 to +10 V: 1/16,000 (14 bits)
0 to 10 V: 1/8,000 (13 bits)
0 to 5 V: 1/4,000 (12 bits)
1 to 5 V: 1/4,000 (12 bits)
4 to 20 mA: 1/4,000 (12 bits)
Analog input refresh method Analog input value can be acquired by either of the following methods:
• END Refresh
Read the data from A550 in the Motion Control Module’s Auxiliary Area. (Data is
stored in A550 during END refreshing after execution of END instruction)
• Immediate Refresh
Read the present analog input value immediately by executing the PRV(881)
instruction.
Analog input value storage area A550 of Motion Control Module’s Auxiliary Area
With the immediate refresh, the present analog input value can be acquired by exe-
cuting the PRV(881) instruction.
Overall accuracy Voltage input: Current input:
±0.2% (23 ±2°C)
±0.4% (0 to 55°C)
±0.4% (23 ±2°C)
±0.6% (0 to 55°C)
Function Offset/gain
adjustment
Input values can be adjusted to correct inputs suitable for the connected devices.
In PROGRAM mode, specify an offset or gain value, input the analog value from the
device (the value that will be corrected with the offset or gain value), and use the
CX-Programmer to monitor the adjustment value in the Adjustment Value Monitor
Area (A572 and A573).
It is also possible to monitor averaged offset or gain values. If averaging is required,
set the number of average value samples in A574.
100%
50%
0.5 1
0
1.5
80%
Response (%)
Time
(
ms
)