HIEE300885R0102工控模塊,HIEE300885R0102產(chǎn)品尺寸
用于90-30系列可編程邏輯的4通道模擬電流輸入模塊控制器提供四個輸入通道，每個通道能夠將模擬輸入信號轉換為根據(jù)應用要求使用的數(shù)字信號。該模塊提供兩個輸入范圍。默認范圍為4至20 mA，用戶數(shù)據(jù)按比例縮放，使4 mA對應于0計數(shù)20 mA對應32000個計數(shù)，每1000個計數(shù)代表0.5 mA。什么時候在輸入/輸出端子板上添加跳線，輸入范圍隨用戶更改為0至20 mA對數(shù)據(jù)進行縮放，
HIEE300885R0102工控模塊使0 mA對應于0的計數(shù)，20 mA對應于0的計數(shù)32000，每800個計數(shù)代表0.5 mA。隨附兩個范圍跳線單元一個用于通道1和2，另一個用于通道3和4。四個通道中每個通道的轉換速度為半毫秒。這提供了一個任何通道的兩毫秒更新率。轉換信號的分辨率為12位任意范圍內(nèi)的二進制（4096中的1部分）。%AI寄存器中的用戶數(shù)據(jù)為16位2補碼格式。將A/D轉換器的12位放入%AI數(shù)據(jù)中文字如下所示。電流輸入和A/D數(shù)據(jù)之間的關系轉換器如圖3-14和3-15所示。如果電流源反向輸入，或小于電流范圍的低端，然后，模塊將輸出與電流范圍低端對應的數(shù)據(jù)字（0000H，單位：AI）。如果輸入的輸入超出范圍（即大于20 mA），則A/D轉換器將輸出至滿標度（對應于7FF8H，單位為%AI）。輸入比例如下圖所示。
The 4-Channel Analog Current Input module for the Series 90-30 Programmable Logic
Controller provides four input channels, each capable of converting an analog input signal to a
digital signal for use as required by your application. This module provides two input ranges.
The default range is 4 to 20 mA with user data scaled so that 4 mA corresponds to a count of 0
and 20 mA corresponds to a count of 32000 with each 1000 counts representing 0.5 mA. When
a jumper is added to the I/O terminal board, the input range is changed to 0 to 20 mA with user
data scaled so that 0 mA corresponds to a count of 0 and 20 mA corresponds to a count of
32000 with each 800 counts representing 0.5 mA. Two range jumpers are provided with the
module; one for channels one and two, and the other for channels three and four.
Conversion speed for each of the four channels is one-half millisecond. This provides an
update rate of two milliseconds for any channel. Resolution of the converted signal is 12 bits
binary (1 part in 4096) over either range. User data in the %AI registers is in 16-bit 2’s
complement format. The placement of the 12 bits from the A/D converter in the %AI data
word is shown below. The relationship between the current input and the data from the A/D
converter is shown in Figures 3-14 and 3-15.If the current source is reversed into the input, or is less than the low end of the current range,
then the module will output a data word corresponding to the low end of the current range
(0000H in %AI). If an input that is out of range is entered (that is, it is greater than 20 mA), the
A/D converter will output up to full scale (corresponding to 7FF8H in %AI).
Input scaling is shown in the next figure.
