PP845 3BSE042235R1觸摸顯示屏,3BSE042235R1用戶手冊
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，PP845 3BSE042235R1每個通道能夠將模擬輸入信號轉換為
根據應用要求使用的數字信號。此模塊提供兩個輸入范圍。
默認范圍為4至20 mA，用戶數據經過縮放，因此4 mA對應于0計數
20 mA對應32000個計數，每1000個計數代表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
對數據進行縮放，使0 mA對應于0的計數，20 mA對應于
32000，每800個計數代表0.5 mA。配有兩個量程跳線PP845 3BSE042235R1觸摸顯示屏
單元一個用于通道1和2，另一個用于通道3和4。
四個通道中的每個通道的轉換速度為半毫秒。這提供了
任何通道的兩毫秒更新率。轉換信號的分辨率為12位
任意范圍內的二進制（4096中的1部分）。%AI寄存器中的用戶數據為16位2
補碼格式。A/D轉換器的12位在%AI數據中的位置
word如下所示。當前輸入與A/D數據之間的關系
轉換器如圖3-14和3-15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.
