Chapter 2 Analog Input Module AH04AD/AH08AD 3. Average Digital values are averaged. The number by which the sum of several digital values is divided is between 1 and 100. The sampled values are taken as a queue, and the length of the queue is N. Each time a new sampled value is put at the end of the queue, an original value at the start of the queue is removed. The N values are averaged so that the periodic noise is suppressed. 4. Scale range The analog input mode of a channel has a corresponding digital range, that is, an analog range corresponds to a digital range.
For example, if the analog range is -10 V~10 V and the digital range is -10.0~10.0, the analog values -10 V~10 V correspond to the digital values -10.0~10.0. Analog value 10 V Rated input range -10 V 10.0 -10.0 Digital value 5. Disconnection detection Scale range Only if the analog rang is 4 mA~20 mA or 1 V~5 V does the disconnection detection function. If a module which can receive inputs ranging from 4 mA to 20 mA or from1 V to 5V is disconnected, an input signal will exceed the range of inputs which can be received by the hardware, and the module will give an alarm or a warning. Please refer to the description below for more information. 6.
Channel detection If an input signal exceeds a range of inputs which can be received by hardware, an error message appears. Please refer to section 1.2.1 for more information. a. Giving alarms or warnings The procedure below explains how to set a module so that it gives an alarm or a warning. 2-9