ABB DSAI155 57120001-HZ模拟输入板
注意，如果安装了T20选项，且模拟输出范围设定值设置为0-20 mA，则此消息表示信号范围的0 mA结束。•MAIN/ALT 20 mA Value（主/备用20 mA值）：此消息显示在每个模拟输出上，允许用户分配一个数值，该数值对应于4至20 mA信号范围（T20选项）的20 mA端或0至1 mA信号范围的1 mA端（T1选项）。数值范围将取决于选择的参数。有关详细信息，请参阅下面的表4–3：模拟输出参数。如果4 mA（或0 mA）值编程为高于20 mA（或1 mA）值，则模拟输出将随着值的增加而向4 mA（或者0 mA）减小，而模拟输出将随值的减小而向20 mA（或者1 mA）增大。如果4 mA（或0 mA）和20 mA（或1 mA）值编程为相同的值，输出将始终为4 mA（或者0 mA）。
Note that if the T20 option is installed and the ANALOG OUTPUT RANGE setpoint is set to 0-20 mA, this message represents the 0 mA end of the signal range. • MAIN/ALT 20 mA Value: This message appears for each analog output and allows the user to assign a numeric value which corresponds to the 20 mA end of the 4 to 20 mA signal range (T20 option) or the 1 mA end of the 0 to 1 mA signal range (T1 option). The numeric value range will depend upon which parameter is selected. See Table 4–3: Analog Output Parameters below for details. If the 4 mA (or 0 mA) value is programmed to be higher than the 20 mA (or 1 mA) value, the analog output will decrease towards 4 mA (or 0 mA) as the value increases and the analog output will increase towards 20 mA (or 1 mA) as the value decreases. If the 4 mA (or 0 mA) and 20 mA (or 1 mA) values are programmed to an identical value, the output will always be 4 mA (or 0 mA).
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