RELIANCE 57552-4控制器
报警功能块可按每个回路一个使用
并包含与输入P相关的四（4）个报警（正常情况下向控制器功能块的过程输入）。每个警报可以配置为无、高、低、HDEV、LDEV、DEV，和或。
偏差型报警将输入P与输入D进行比较
偏差输入，通常为回路设定点（即控制器功能块），具有与输入相同的范围
P、 超出范围（OR）报警比较过程输入
使用范围指针参数指定的范围限制
（输入R）。此参数必须指向以下功能块：包括MINSCALE和MAXSCALE配置
适当缩放的参数（如模拟输入）。如果没有配置后，0.0-100.0将用作默认范围。
报警的优先级为1到5，其中1为最高，并且按优先顺序报告给操作员面板，并且然后按发生顺序。优先级1导致站点
条形图和条件（如A1、HI）闪烁，并要求
确认停止闪烁。优先级2还闪烁
条形图和条件，但报警时停止闪烁清除（即自清除）。优先级3导致事件指示灯（L和S）和闪光条件。只有当确认报警。优先级4也会导致事件指示灯并且条件闪烁，但在警报清除时停止。优先级5显示报警，但不要求报警承认。
报警限值以工程单位表示。快速警报
该功能还可用于快速设置报警限值
在操作期间。设置单位为工程单位，但将：还应在条形图上以范围的%显示。报警按范围指针参数的定义显示。报警可以设置为指针定义范围的-10%至110%范围内的任何工程值。如果范围为更改后，当前报警设置将在新范围内更改为相同的%。例如，如果HI报警当前设置为100.0，范围为0.0至100.0且范围更改为300.0至400.0，HI报警将移动到400.0。
在快速设置报警模式下，可以启用或禁用每个报警。该配置允许报警：
在冷启动时启用或禁用。当报警被禁用时，它将不工作，但将保留以下设置：
返回到启用模式。与报警相关的完整操作员面板功能在章节中描述
描述具体的面板设计。所有报警都具有以下功能：死区-要求信号低于或超过死区量的极限设置
在警报清除（变低）之前。报警死区设置为范围指针刻度的固定百分比。
ALARM function blocks can be used on a one per loop basis and contain four (4) alarms associated with Input P (normally the process input to the controller function block). Each alarm can be configured as NONE, HI, LO, HDEV, LDEV, DEV, and OR. Deviation type alarms compare Input P with Input D, the deviation input, normally the loop setpoint (i.e. the setpoint to the controller function block), having the same range as Input P. An Out of Range (OR) alarm compares the process input with the range limits specified by the range pointer parameter (input R). This parameter must point to a function block that includes MINSCALE and MAXSCALE configuration parameters (e.g. Analog Input) for proper scaling. If not configured, 0.0-100.0 will be used as a default range. Alarms have priorities 1 to 5, with 1 the highest and are reported to the operator faceplate in order of priority first and then in order of occurrence. Priority 1 causes the station bargraphs and condition (e.g. A1 HI) to flash and requires acknowledgment to stop flashing. Priority 2 also flashes the bargraphs and condition but stops flashing when the alarm clears (i.e. Self Clearing). Priority 3 causes the event LEDs (L and S) and condition to flash. Flashing stops only when the alarm is acknowledged. Priority 4 also causes the event LEDs and condition to flash but stops when the alarm clears. Priority 5 displays the alarm but does not require that it be acknowledged. Alarm limits are in engineering units. A quickset ALARM feature is also available allowing alarm limits to be set quickly during operation. The settings are in engineering units but will also be displayed in % of range on the bargraph. Alarms are displayed as defined by the range pointer parameter. Alarms can be set to any engineering value within -10% to 110% of the range defined by the pointer. If a range is changed, the current alarm settings will be changed to be the same % within the new range. For example, if a HI alarm is currently set at 100.0 with a range of 0.0 to 100.0 and the range is changed to 300.0 to 400.0, the HI alarm will be moved to 400.0. Each alarm can be enabled or disabled when in the quickset ALARM mode. The configuration allows an alarm to be enabled or disabled on a cold start. When an alarm is disabled, it will not operate but will retain settings for return to the enabled mode. Complete operator faceplate functions, relating to alarms, are described in the sections describing the specific faceplate design. All alarms have the following features: Deadband - requires that the signal either drop below or exceed the limit setting by the amount of the deadband before the alarm clears (goes low). The alarm deadband is set as a fixed % of the range pointer scale.
