51454470-175 输入/输出模块

描述

51454470-175 输入/输出模块

TC/RTD IOM支持PV出厂前Open Sensor Detect的配置参数。在激活OTD配置的情况下，PV被采样并保持，同时在同一测量窗口内执行OTD周期。如果OTD是负的，PV通过系统向上传播。若OTD为正，则PV置为NAN，输入通道软故障置为。这样，就不会出现由于热电偶打开而导致PV值无效的不适当控制动作。PV取样/报告不会因OTD处理而增加延迟。

显著的特征
•TC和RTD操作
•远程冷端补偿能力
•1次带OTD保护的PV扫描
•可配置OTD保护(见下文)
•温度点可以添加16点增量

温度变量以1秒的速率从所有点收集。1秒的更新包括一个
可配置的检查打开热电偶检测(OTD)(见下文)之前的传播
温度变量。所有TC输入包括积分冷端补偿(CJC)。

51454470-175

51454470-175 输入/输出模块

The TC/RTD IOM supports a configuration parameter for Open Sensor Detect before PV delivery. With the OTD configuration active, the PV is sampled and held while an OTD cycle is performed within the same measurement window. If the OTD is negative, the PV is propagated up through the system. If the OTD is positive, the PV is set to NAN and the input channel soft failure is set. In this way, no inappropriate control action occurs for PV values that are invalid due to an open thermocouple. PV sampling/reporting incurs no added delays from OTD processing.

Notable Features
• TC and RTD operation
• Remote cold junction compensation capability
• 1 Second PV scanning with OTD protection
• Configurable OTD protection (See below)
• Temperature points can be added in 16 point increments

The Temperature variable is collected from all points at a 1 second rate. The 1 second update includes a
configurable check for Open Thermocouple Detection (OTD) (see below) before propagation of the
temperature variable. All TC inputs include integral Cold Junction Compensation (CJC).