参数资料
型号: 20-151-0178
厂商: Rabbit Semiconductor
文件页数: 61/162页
文件大小: 0K
描述: CABLE CONVERTER RS-232 TO USB
标准包装: 1
附件类型: USB 至 RS232 适配器
适用于相关产品: 基于 Rabbit 的板
产品目录页面: 619 (CN2011-ZH PDF)
其它名称: 20-151-0178-ND
316-1181
4.3.13.3 Analog Input 4-20 mA
This section presents the circuit schematic and the characteristics for the 4-20 mA analog input.
This analog input provides a simple interface for industry standard 4-20 mA devices. It is a passive input
and the device must either supply the loop current or be wired in series with a supply to operate correctly.
The loop is formed by using the input pin as the SIG+ line and the ground pin as the SIG- or signal return.
A design consideration for choosing the appropriate ADC circuit for your application is the fact that cur-
rent is preferred over voltage in noisy industrial/control environments where the transmission of low-
amplitude, low-frequency signals must travel significant distances. This is because the current stays con-
stant over the length of the cable.
Figure 4-27 Analog Input 4-20 mA Circuit Schematic
I/O
Pin
R5
2.2 k W
R7
100 W
C1
10 nF
Analog Input
Cell
VERSION 6.01
Analog Input, 4?20 mA
Table 4-23. ADC 4-20 mA Characteristics
RabbitFLEX User’s Manual
55
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