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产品类别：模块卡件
品牌：DCS、PLC
电话：15270269218
联系人：叶经理
质保期：1年
加工定制：不可定制
产地/厂家：美国
可能导致减少的异常情况，或
功能单元执行以下操作的能力丧失：
这是必需的功能。
故障避免使用旨在避免
在安全的任何阶段引入故障
安全相关系统的生命周期。
功能单元继续执行以下操作的容错能力：
存在故障时所需的功能（注意：
假设安全功能，而不是过程可用性
问题）。
FBD功能框图
FDRT，故障检测
反应时间
从错误发生到
采取定义的动作。
强制强制输入/输出变量会导致自动
并且可以手动输入值。
强制输入通道时，强制值为
传递给应用程序。
强制输出通道时，强制值为
传递给输出模块。
现场可编程门阵列
FPL固定程序语言（IEC 61511）
FSA功能安全评估
FVL全可变语言（IEC 61511）
灰色通道：系统或功能的一部分，其中任何电位
从灰色外部检测对安全的影响
由安全系统引导。
热更换：可以用电源更换硬件
连接到该单元。
IL指令列表
术语描述
关于本书的术语
34 3BNP004865-513修订版
无干扰硬件和软件功能经认证可用于
AC 800M HI用于非安全相关功能。
LD梯形图
腿部负荷评估Go：启用动态的功能
正在运行的应用程序与新应用程序之间的比较
应用
逻辑求解器
（IEC 61511）
BPCS或SIS中执行一个的部分
或更多逻辑功能。
注：传感器和最终元件不属于
逻辑求解器。
LVL有限可变性语言（IEC 61511）
运行模式-低需求：其中
安全相关系统上的操作不大于
每年一次，且不超过验证试验的两倍
频率
-高需求或连续：其中
安全相关系统的操作要求为：
每年超过一次或超过两次验证频率。
MTU模块终端单元
NC常闭
ND正常断电输出，通电跳闸
安全状态定义为断电。
NE正常通电输出，断电跳闸
安全状态定义为断电。
无常开
在线更换：无需更换硬件/软件部件
影响受控过程
Abnormal condition that may cause a reduction in, or
loss of, the capability of a functional unit to perform a
required function.
Fault avoidance Use of techniques and procedures, which aim to avoid
the introduction of faults during any phase of the safety
lifecycle of the safety-related system.
Fault tolerance Ability of a functional unit to continue to perform a
required function in the presence of faults (NOTE:
Assuming safety functions, not process availability
issues).
FBD Function Block Diagram
FDRT, Fault Detection
and Reaction Time
The maximum time from an error occurs to the
defined action is taken.
Force Forcing an I/O variable causes a stop in the automatic
update, and manual entry of values is possible.
When an input channel is forced, the forced value is
passed to the Application.
When an output channel is forced, the forced value is
passed to the output module.
FPGA Field Programmable Gate Array
FPL Fixed Program Language (IEC 61511)
FSA Functional Safety Assessment
FVL Full Variability Language (IEC 61511)
Gray channel Part of a system or function where any potential
influence on safety is detected externally from the gray
channel by the safety system.
Hot replacement Replacement of hardware that may be done with power
connected to the unit.
IL Instruction List
Term Description
Terminology About This Book
34 3BNP004865-513 RevA
Interference free Hardware and software functions certified to be used in
AC 800M HI for non safety related functions.
LD Ladder Diagram
LEG Load Evaluate Go: A function to enable dynamic
compar***n between running application and new
application.
Logic solver
(IEC 61511)
That portion of either a BPCS or SIS that performs one
or more logic function(s).
Note: Sensors and final elements are not part of the
logic solver.
LVL Limited Variability Language (IEC 61511)
Mode of operation - Low demand: where the frequency of demands for
operation on a safety-related system is no greater than
one per year and no greater than twice the proof-test
frequency.
- High demand or continuous: where the frequency of
demands for operation on a safety-related system is
greater than one per year or greater than twice the prooftest frequency.
MTU Module Termination Unit
NC Normally Closed
ND Normally De-energized output, energize to trip
Safe state is defined as de-energize.
NE Normally Energized output, de-energize to trip
Safe state is defined as de-energize.
NO Normally Open
On-line replacement Replacement of hardware/software parts without
affecting the process under contro
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