Delta AH500 Manual page 99

b. Interrupt service routine
The procedure below explains how to trigger an interrupt service routine in a CPU
module.
 The interrupt service routines are I40~I251.
 Analog output
Item Function
Enabling/Disabling
1
a channel
2 Calibration
3 Scale range
Retaining an
4
output
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 outputs 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.
C h ap te r 4 A na lo g In pu t /O u tput Mo du le A H 0 6X A
No (No detection)
No
No interrupt
1. Users can enable or disable a channel.
2. If a channel is disabled, the total conversion time is decreased.
Users can calibrate an analog output curve.
A digital range corresponds to an analog range.
When a module stops running, a signal sent by the module is
retained.
Channel
detection
Alarm/Warning
Enabling
physical range
detection
Yes
Enabling
interrupts
Yes
Selecting interrupt
numbers
Description
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