MVI94-MBM 通信模块用于Modbus从设备的接口

【产品详情】

MVI94-MBM通信模块用于Modbus从设备的接口

使用Flex I/O系统。该模块包含一个虚拟Modbus数据库

由用户定义。该数据库用于请求和命令消息

从Modbus主端口发送到Modbus从设备。数据区域中的虚拟

Modbus数据库可以保留状态和错误信息产生的

模块在用户控制下。

虚拟Modbus数据库还使用Flex与Flex I/O系统进行接口

I/O总线(背板)。数据提供给PLC或任意处理器

控制器网采用此背板接口。输入和输出图像表

模块用于将虚拟Modbus数据库中的数据呈现给用户

底板。

通信模块上有一个Modbus主端口，用于连续轮询

Modbus从设备。最多可以定义100个自定义命令

端口。从Modbus从设备读取的数据放在虚拟Modbus中

数据库。对Modbus从设备的任何写请求都来自于数据

从虚拟Modbus数据库。

该模块可以配置为放置不响应的从设备

优先级较低的命令。如果模块识别从设备失败

在用户定义重试计数之后响应消息，它将从服务器标记为“in”

“通信失败”，并将错误延迟计数器设置为用户指定的值。

每次模块在命令列表中遇到这个从属节点时，计数器将被关闭

递减。当该值达到零时，从机将被置于活动状态

的地位。该功能可以提高Modbus网络的通信吞吐量。

命令可以在处理器控制下的模块中激活。这个特性

允许处理器在程序下的命令列表中发出命令

控制。当一个命令被激活时，它将被放置在命令队列中

立即执行。普通命令轮询将在命令队列之后开始

是完全加工过的。

此外，处理器可以将命令直接发送到连接到的任何从机

Modbus主端口。此特性可用于未在上发出的命令

常规基础和不在命令列表中。作为事件提交的命令是

放置在命令队列中以便立即执行。他们会先发制人

投票列表的操作。当命令队列完全为空时，正常

命令轮询将恢复。

该模块提供了一个配置/调试端口，用于外部计算机

执行终端仿真程序。提供了终端仿真程序

该模块允许上传和下载配置信息

模块要求。另外，Configuration/Debug端口提供了一个视图

进入虚拟Modbus数据库，进行通信统计和配置。

MVI94-MBM 通信模块用于Modbus从设备的接口

【英文介绍】

The MVI94-MBM communication module is used to interface Modbus slave devices

with the Flex I/O system.  The module contains a virtual Modbus database that is

defined by the user.  This database is used for the request and command messages

sent from the Modbus master port to Modbus slave devices.  Data areas in the virtual

Modbus database can be reserved for status and error information generated by the

module under user control.

The virtual Modbus database also interfaces with the Flex I/O system using the Flex

I/O bus (backplane).  Data is made available to the PLC or any processor on a

ControlNet network using this backplane interface.  Input and output image tables in

the module are used to present the data in the virtual Modbus database to the

backplane.

A Modbus master port is present on the communication module to continuously poll

Modbus slave devices.  Up to 100 user-defined commands can be defined for the

port.  Data read from Modbus slave devices are placed in the virtual Modbus

database.  Any write requests for the Modbus slave devices are sourced with data

from the virtual Modbus database.

The module can be configured to place slave devices that are not responding to

commands at a lower priority.  If the module recognizes a slave device has failed to

respond to a message after the user defined retry count, it will mark the slave as "in

communication failure" and set the error delay counter to the user specified value.

Each time the module encounters this slave in the command list, the counter will be

decremented.  When the value reaches zero, the slave will be placed in an active

status.  This facility can improve communication throughput on the Modbus network.

Commands can be activated in the module under processor control.  This feature

permits the processor to issue a command in the command list under program

control.  When a command is activated, it will be placed in the command queue for

immediate execution.  Normal command polling will begin after the command queue

is completely processed.

Additionally, the processor can send a command directly to any slave attached to the

Modbus master port.  This feature can be used for commands that are not issued on

a regular basis and are not in the command list.  Commands submitted as events are

placed in the command queue for immediate execution.  They will preempt normal

operation of the poll list.  When the command queue is completely empty, normal

command polling will resume.

The module provides a Configuration/Debug port for use with an external computer

executing a terminal emulation program.  The terminal emulation program provided

with the module permits uploading and downloading of the configuration information

required by the module.  Additionally, the Configuration/Debug port provides a view

into the virtual Modbus database, communication statistics and the configuration.

MVI94-MBM 通信模块用于Modbus从设备的接口

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