8280-412 8280412 模块备件

产品标题：8280-412 8280412 控制器调速扩展卡 WOODWARD

产品参数：

型号：8280-412 8280412  

质保：七天验收期，质保期一年

品牌：  WOODWARD
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产品详情资料
增益值乘以高电平输入的电压，即
低电平输入和热电偶输入为毫伏，RTD输入为欧姆。默认用户增益值为1。用户偏移被添加到输入信号。偏移单位指定为高电平输入的伏特，低电平输入的毫伏，RTD输入的欧姆。默认的用户偏移量值为零。可以为每个输入通道和每个输入类型指定单独的用户增益和偏移值。可以使用FC 217设置和重置用户增益和偏移值。一旦定义，用户增益和偏置值将保留在非易失性存储器中，并且在模块电源中断时不会丢失。有关更多信息，请参阅编写器功能代码应用手册中的FC 217。
工程单位换算
热电偶和RTD输入转换为FC 216中规定的温度单位，即摄氏度或华氏度。表示电压（或电阻）与温度关系的转换表用于此转换。用于执行转换的表取决于
指定了输入信号类型。如果输入被识别为毫伏或高电平电压，则使用指定的工程单位零和量程值将输入读数转换为标度工程单位值。如果在转换为工程单位（FC 215和FC 216块外部）之前需要进行特殊计算，则函数中指定的零点和量程值
代码应设置为表示输入的标准电压范围。然后，输入/输出模块FC 216将输出校正的电压输入读数，该读数可在控制器诊断、安全和完整性检查中进行处理
WBPEEUI240774A0 2-9通过平方根、多项式或其他函数块，然后是缩放函数，以提供工程中的值。自动校准输入通道电路漂移的补偿通过以下方式完成：
使用
内部精度低漂移参考。此功能对正常输入通道处理透明。
现场校准
正常情况下不需要现场校准。它是
可以执行校准 gain value is multiplied by volts for high level inputs, by
millivolts for low level inputs and thermocouple inputs, and byohms for RTD inputs. The default user gain is a value ofone.User offset is added to the input signal. Units of offset arespecified as volts for high level inputs, millivolts for low levelinputs,and ohms for RTD inputs. The default user offset is a value ofzero. Separate user gain and offset values can be specified foreach input channel and each input type. The user gain andoffset values can be set and reset using FC 217. Oncedefined,user gain and offset values remain in nonvolatile memoryandare not lost when module power is interrupted. For more information refer to FC 217 in the Composer Function Code Application Manual.
Engineering Units Conversion
Thermocouple and RTD inputs are converted to the temperature units specified in FC 216, either degrees C or F. Conversion tables representing the voltage (or resistance) totemperature relationship are used for this conversion. Theable used in performing the conversion depends upon the
input signal type specified.If the input is identified as either millivolt or high level voltage,then the specified engineering unit zero and span values areused to convert the input reading to a scaled engineering unitvalue. If special calculations need to be performed prior to conversion to engineering units (external to FC 215 and FC 216blocks), then the zero and span values specified in the function
code should be set to represent a standard voltage span fortheinput. The I/O module FC 216 would then output a correctedvoltage input reading which may be processed in thecontroller Diagnostic, Security, and Integrity Checks
WBPEEUI240774A0 2 - 9through a square root, polynomial, or other function block followed by a scaling function to provide the value inengineeringunits.Automatic CalibrationCompensation for drift of inputchannel circuitry is done by
periodic automatic calibration of each A/D converter using an
internal precision low-drift reference. This function is transparent to normal input channel processing.
Field Calibration
Field calibration is not necessary in normal situations. It is
possible to perform calibration

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