Delta AH500 - Functions

Chapter 4 Analog Input/Output Module AH06XA
4-7
4.2.5 Functions
HWCONFIG, built-in utility software in ISPSoft, can be used to set a module. Users can set modes
and parameters by means of HWCONFIG.
 Analog input
Item Function Description
1
Enabling/Disabling
a channel
1. Users can enable or disable a channel.
2. If a channel is disabled, the total conversion time is
decreased.
2 Calibration Users can calibrate a linear curve.
3 Average Conversion values are averaged and filtered.
4 Scale range An analog range corresponds to a digital range.
5
Disconnection
detection
Only if the analog rang is 4 mA~20 mA or 1 V~5 V does the
disconnection detection function.
6 Channel detection
If an input signal exceeds a range of inputs which can be
received by hardware, the module will give an alarm or a
warning.
a. Warning LED indicator: When a warning occurs, the ERROR
LED indicator blinks or does not blink.
b. Interrupt: An interrupt service routine is enabled.
1. Enabling/Disabling a channel
The conversion speed is 150 μs a channel, and the total conversion time is 150 μs×(the
number of channels). If a channel is not used, users can disable it to decrease the total
conversion time.
2. Calibration
 To make a curve meet actual needs, users can calibrate the curve by changing an offset
and a gain. A calibration range depends on a range of inputs which can be sent by
hardware.
 A volt is a unit of calibration for offsets if inputs received or outputs sent are voltages. A
milliampere is a unit of calibration for offsets if inputs received or outputs sent are
currents.
 The range of offsets used for calibration is -1.0~1.0, and the range of gains used for
calibration is 0.9~1.1.
Example 1:
The inputs received by a channel are voltages in the range of -10.0 V to +10.0 V. The original
signals are used. The gain is 1, and the offset is 0. If the voltage received by the channel is 0 V,
the digital value is -0.05. If the voltage received by the channel is 10.0 V, the digital value is 9.95.
Users can calibrate the channel by calibrating the gain and the offset.
The users can get the gain for the calibration by means of the equations below.
Gain=(Y2-Y1)/(X2-X1)=[9.95-(-0.05)]/(10-0)=1
Gain used for calibration=1/Gain=1/1=1
The users can get the offset for the calibration by means of the equations below.
Offset=Y1= -0.05
Offset used for calibration=0-Y1=0.05