HIEE401481R0001 UAC326AE01 DCS卡件
为强制默认值列出的故障条件）。如果不需要该操作，则可通过首先关闭现场电源并在热卸下模块之前卸下该模块的接线板，将输出强制设置为默认值。▪ 即使配置了默认值，使用SVC_REQ 24重置模块也会导致所有通道保持最后状态。应用程序必须在执行Service Request之前处理输出默认值。▪ 如果电源的背板电源丢失，则忽略默认斜坡速率配置。为“默认值”配置的通道立即变为默认值。▪ 背板电源恢复后首次存储配置时，不使用默认斜坡速率。为“默认值”配置的任何通道都会立即变为其默认值。如果模拟电源未丢失，并且在下一次通电时恢复了相同的配置，则信道状态自断电时起保持不变。默认斜坡速率用于任何后续重新配置。输出默认条件和动作条件保持最后状态或默认值默认斜坡速率启用输出启用和斜坡速率启用通道输出设置（除非另有说明，否则假设存在场功率）。输出启用和无故障N/A N/A无输出从参考存储器转到其命令值；默认值不适用。N/A N/A是输出以输出启用斜坡速率斜坡至参考存储器的命令输出。默认值不适用。输出禁用、故障模式或重新配置默认值否N/A输出设置为默认值默认值是N/A输出以默认斜坡速率斜坡至默认值，从进入模式前的最后一个命令值开始。PACSystems*RX3i系统手动模块，带HART通信526信道参数（续）参数默认说明高标度值（英制单位）四个标度参数的默认值取决于配置的量程类型和量程。每个范围和范围类型都有一组不同的默认值。注：如果高量程工程单位等于高量程A/D单位，而低量程工程单位则等于低量程A/D单位时，则禁用缩放。默认值=所选范围类型的A/D上限。低量程值（工程单位）默认值为所选量程类型的低A/D限值。必须低于高缩放值。高比例值（A/D单位）默认值为所选范围类型的高A/D限制。必须大于低缩放值。低量程值（A/D单位）默认值为所选量程类型的低A/D限值。11.3.5.2.3输出缩放：ALG728默认情况下，模块将CPU的浮点值转换为其配置范围的整个范围内的电压或电流输出。例如，如果信道的范围为4至20mA，则模块接受4.000至20.000的信道输出值。通过修改四个信道缩放参数（低/高缩放值参数）中的一个或多个，可以针对特定应用更改缩放工程单位范围。缩放始终是线性的，可以进行逆缩放。所有报警值都适用于缩放的工程单位值，而不是A/D单位值。缩放参数仅设置两组对应值之间的线性关系。它们不一定是输出的极限。
fault conditions listed for Force to Default Value). If that operation is not desirable, the outputs can be forced to default by first turning off field power and removing the Terminal Block of this module before hot-removing the module. ▪ Resetting the module using SVC_REQ 24 causes all channels to Hold Last State even if Default Value is configured. The application program must handle output defaulting before execution of the Service Request. ▪ Default Ramp Rate configuration is ignored if backplane power from the power supply is lost. Channels configured for Default Value go to the default value immediately. ▪ The first time a configuration is stored following a return of backplane power, the Default Ramp rate is not used. Any channel configured for Default Value goes to its default value immediately. If analog power was not lost and the same configuration is restored on the next power-up, the channel state is unchanged from the time the power was lost. The Default Ramp Rate is used for any subsequent reconfiguration. Output Default Conditions and Actions Condition Hold Last State or Default Value Default Ramp Rate Enabled Outputs Enabled and Ramp Rate Enabled Channel Output Setting (Except where indicated, field power is assumed to be present). Outputs Enabled and No Faults N/A N/A No Output goes to its commanded value from reference memory; defaults don’t apply. N/A N/A Yes Output is ramped to the commanded output from reference memory at the Outputs Enabled ramp rate. Defaults don’t apply. Outputs Disabled, Fault Mode, or Reconfiguration Default Value No N/A Output is set to the Default Value Default Value Yes N/A Output is ramped to the Default Value at the Default ramp rate, starting at the last commanded value before entering mode. PACSystems* RX3i System Manual Modules with HART Communications 526 Channel Parameters (Continued) Parameter Default Description High Scale Value (Eng Units) The defaults for the four Scaling parameters depend on the configured Range Type and Range. Each Range and Range Type have a different set of defaults. Note: Scaling is disabled if both High Scale Eng. Units equals High Scale A/D Units and Low Scale Eng. Units equals Low Scale A/D Units. Default = High A/D Limit of selected range type. Low Scale Value (Eng Units) Default is Low A/D Limit of selected range type. Must be lower than the high scaling value. High Scale Value (A/D Units) Default is High A/D Limit of selected range type. Must be greater than the low scaling value. Low Scale Value (A/D Units) Default is Low A/D Limit of selected range type. 11.3.5.2.3 Output Scaling: ALG728 By default, the module converts a floating-point value from the CPU into a voltage or current output over the entire span of its configured Range. For example, if the Range of a channel is 4 to 20mA, the module accepts channel output values from 4.000 to 20.000. By modifying one or more of the four channel scaling parameters (Low/High Scale Value parameters) from their defaults, the scaled Engineering Unit range can be changed for a specific application. Scaling is always linear and inverse scaling is possible. All alarm values apply to the scaled Engineering Units value, not to the A/D units value. The scaling parameters only set up the linear relationship between two sets of corresponding values. They do not have to be the limits of the output.
