IDEC SmartAXIS Touch FT1A Series, Instruction Sheet

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15
● Equivalent Circuit
■ FT1A-*12RA
AD Conversion
Sample Duration Time 2 msec max.
Sample Repetition Time 2 msec max.
Total Input System
Transfer Time
3 msec + filtering time + scan time (Voltage Input)
12 msec + filtering time + scan time (Current Input)
Input Error
Maximum Error at 25°C ±3.0% of full scale
Temperature Coefficient ±0.04%/°C of full scale
Maximum Error
±5.0% of full scale
General
Characteristics
Operating Mode Self-scan
Conversion Method SAR
Status Display Device Monitor screen (LCD)
Maximum Temporary Error during Electrical
Noise Tests
±5.0% of full scale
Recommended Cable for Noise Immunity Twisted pair shielded cable
Calibration or Verification to Maintain Rated
Accuracy
Not possible
Maximum Permanent Allowed Overload (No
Damage) 28.8V DC (Voltage Input)
40mA (Current Input)
Overload Status (Outside Input Range)
Detection
Detectable
Isolation
Between input terminals Not isolated
Between input and
internal circuit
Not isolated
Used as Digital
Input
Digital Input Type — ( EC 61131-2 digital input type is not supported)
Input Threshold
ON voltage: 15V min.
(ON current: 0.20 mA min.)
OFF voltage: 5V max.
(OFF current: 0.06 mA max.)
Sink Input (I0 to I5) Shared Digital/Analog Input ( 6, I7)
Internal Circuit
Input
circuit
4 3kΩ
1 2kΩ
OV
24V DC
Input
circuit
56kΩ
22kΩ
OV
24V DC
Internal Circuit