Chapter 2 Analog Input Module AS04/08AD-A 2_ 1. Enable/Disable a channel An analog signal is converted into a digital signal at a rate of 2 ms per channel. The total conversion time is 2 ms X (the number of channels). If a channel is not used, you can disable it to decrease the total conversion time. 2. Calibration To make a curve meet specific needs, calibrate the curve by changing the offset and the gain. The calibration range depends on the range of inputs that the hardware can receive. The formula is: Example: A channel receives voltage inputs between -10.0 V to +10.0 V. The gain is 1000, and the offset is 0.
The corresponding value for the original signal -10.0 V to +10.0 V is -32000 to +32000. If you change the offset to -100, the calibrated value for the original signal -10.0 V to +10.0 V becomes -31900 to +32100. Signals after the calibration -32 000 32100 Voltage (Y) Analog signal 2-17 Item Function Description 5 Channel Detect and Alarm If an input signal exceeds the range of inputs that the hardware can receive, the module produces an alarm or a warning. You can disable this function. 6 The Limit Detections for Channels Save the maximum/minimum values for channels.
7 Records for Channels (Applicable for AS04AD) Save the analog curves for channels 8 Scale Range When the format is floating-point, you can set the scale range. 10V 0 -31900 Original sign 3200 0 3 Digital val -10V