横河CS3000功能块说明2

●Alarm Processing报警处理

Alarm processing performs various types of alarm check during input processing, calculation processing and output processing in order to detect a process error. When an error is detected, the alarm processing reflects the detection of an alarm in the “alarm status” that is one of the data items of the function block, and also notifies a message indicating the detection result to the operation and monitoring.报警处理执行输入处理，计算处理及输出处理过程中的各种报警检查以便发现处理的错误。当一个错误被发现，报警处理以报警状态形式反映出检测到的报警，报警状态为功能块的一个数据项，并且通知监控一个指示检测结果的信息。

●Data Items数据项

A function block retains various data according to the type of the function block in a database, which includes setup parameters and variable data that may be referenced or set during the operation. Abbreviated names that are assigned to these set parameters and variable data are generically called “data items.”For instance, the function block can perform calculation processing based on a specific data item value and can reflect that processing result in another data item.一个功能块根据功能块的类型在数据库中保持各种数据，包括在操作过程中可能会引用或设置的调整参数和变量。

The controls of the function block, such as “MAN” (manual) and “AUT” (auto), and the “block mode” that indicates the output status are some of the data items.功能块的控制，例如手动和自动和指示输出状态的块模式都是一些数据项。

Main data items are as follows:以下是主要的数据项

• Block mode (MODE) 块模式

• Block status (BSTS)块状态

• Alarm status (ALRM)报警状态

• Process variable (PV)过程变量

• Setpoint value (SV)设定值

• Manipulated output value (MV)输出值

C2. I/O Connection I/O连接

By performing the I/O connection, data can be exchanged between a function block and the connection destination according to the connection method.当执行I/O连接时，数据依照连接方式能在功能块和连接目标间进行交换。

■Connection Destination of I/O Connection I/O连接的连接目标

With I/O connection, the destination and method of connection for each I/O terminal of a function block is specified. When the I/O connection is performed, process I/O, software I/O, communication I/O, fieldbus I/O and other function blocks can be specified as the connection destination of the function block’s I/O terminal. I/O连接中，一个功能块的的每个I/O端子的连接目标和方式都是指定的。当I/O连接执行时，处理接口，软件接口，通讯接口，总线接口及其他功能块可被指定为功能块的I/O端子的连接目标。

●Process I/O 过程I/O

• Analog I/O 模拟I/O

• Contact I/O 接触I/O

●Software I/O

• Internal switch (common switch) 内部开关（公共开关）

• Message output 信息输出

●Communication I/O 通讯I/O

• Word data 自数据

• Bit data 比特数据

●Fieldbus I/O 总线I/O

• Parameter of fieldbus block 总线模块的参数

●Other Function Blocks 其他功能块

• Data items of other function blocks 其他功能块的数据项

• I/O terminals of other function blocks 其他功能块的I/O端子

7th Edition : Apr.20,2001-00

■I/O Connection Methods I/O连接方式

The I/O connection methods include data connection, terminal connection and sequence connection.I/O连接方式包括数据连接，端子连接和顺序连接

●Data Connection

This is the I/O connection method used for reading and setting data with respect to the process I/O, software I/O, communication I/O, fieldbus I/O or other function blocks.这是一种连接方式用于读取和设置与处理接口，软件接口，总线接口，通讯接口或其他功能块相关的数据。

●Terminal Connection

This is the I/O connection method used when connecting between cascade control function blocks or connecting function blocks via a selector switch block (SW-33, SW-91). Data is exchanged between the terminals of two function blocks.端子连接用于串级控制功能块之间或通过一个选择开关模块（SW-33, SW-91）的连接功能块之间。在两个功能块的端子之间数据被交换。

●Sequence Connection

This is the I/O connection method used for testing whether or not the connection destination data used by the sequence control satisfies the conditional expression, or for changing block mode, alarm status, data, etc. of the connection destination.

顺序控制是一种连接方式用于测试顺序控制用到的连接目标的数据是否满足条件表达式或连接目标的转换块模式，报警状态，数据等。

C2.1 Data Connection

Data connection is used when exchanging data values and data status between a function block and the data item of the element specified as the connection destination.数据连接用于在一个功能块和一个指定为连接目标的元件的数据项之间交换数据值和数据状态时使用

■Data Connection数据连接

Data connection is a method in which the element symbol name and data item name of various elements containing data are specified as the I/O connection