怎样使用 S7-224 XP 的模拟量输入通道接收电流信号？
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6ES7214-2AD23-0XB0SIMATIC S7-200, CPU 224XP
6ES7214-2BD23-0XB0SIMATIC S7-200, CPU 224XP
解答：
S7-224 XP 的两路模拟量输入通道被出厂设置为电压信号(0－10V)输入。

为了能够输入电流信号，必须在 A+ 与 M 端 (或 B+ 与 M 端) 之间并入一个500 欧姆的电阻。

与传感器以及电压源的两线制连接方式如图1 所示。

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图 1
与传感器以及电压源的 3 线制连接方式如图 2 所示。

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图 2
与传感器及电压源的 4 线制连接方式如图 3 所示。

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图 3
与电压输出的变送器及电流源的 4 线制连接方式如图
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How through external switching can you use a 0-10V analog input on a makeshift basis also for 0-
20mA?
Display part number
6ES7214-2AD23-0XB0SIMATIC S7-200, CPU 224XP
6ES7214-2BD23-0XB0SIMATIC S7-200, CPU 224XP
Instructions:
The two analog inputs of the S7-224 XP are factory-set for voltage measurement (0..10V). In order to be able to use the inputs as current inputs as well you must incorporate a 500 Ohm resistor between terminals A+ and M (or B+ and M).
Figure 1 shows the connection of a sensor to a voltage source as a 2-conductor connection.
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Fig. 01
Figure 2 shows the connection of a sensor to a voltage source as a 3-conductor connection.
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Fig. 02
Figure 3 shows the connection of a sensor to a voltage source as a 4-conductor connection.
( 24 KB ) Fig. 03
a 4-conductor connection.
( 21 KB ) Fig. 04。