5202-DFNT-MCM4 DF1协议主端口 每个端口独立配置

☆型号：5202-DFNT-MCM4 DF1协议主端口 每个端口独立配置

【产品详情】

可以在模块上配置一个或多个DF1协议主端口，通过串行通信接口(RS-232, RS-422或RS-485)连续与DF1从设备接口。每个端口独立配置。端口上提供半双工(主从)和全双工(点对点)DF1链路支持。用户定义的命令确定要在每个端口上发出的命令。每个端口最多可以定义100个命令。从设备读取的数据放在虚拟数据库中。对DF1从设备的任何写请求都来自虚拟数据库的数据。

该模块可以配置为将不响应主端口命令的从设备置于较低的优先级。如果模块在用户定义的重试计数之后识别到从设备未能响应消息，则将从设备标记为“通信失败”，并将错误延迟计数器设置为指定的值。每次模块在命令列表中遇到此从属时，计数器将递减。当该值为零时，从机将处于活动状态。该功能可以提高网络上的通信吞吐量。

如果将DF1主端口配置为支持DF1半双工协议，则可以使用主端口在从机之间路由消息。点对点通信是通过主站不断轮询网络上的所有从站并转发接收到的消息来完成的。从服务器必须包含带有MSG命令的阶梯逻辑，以生成和接受消息。这种路由可以与上面讨论的普通命令处理结合使用。

可以在模块上模拟DF1从设备以与远程DF1主设备进行接口。每个端口独立配置。端口上提供半双工(主从)和全双工(点对点)DF1链路支持。支持从基本，PLC5和SLC命令集中选择一组功能的仿真。虚拟文件被映射到模块中的内部数据库，以提供对PLC5和SLC命令集的支持。

☆型号：5202-DFNT-MCM4 DF1协议主端口 每个端口独立配置

【英文介绍】

One or more DF1 protocol master ports can be configured on the module to continuously interface with DF1 slave devices over a serial communication interface (RS-232, RS-422 or RS-485).  Each port is configured independently.  Support for half-duplex (master-slave) and full-duplex (point-to-point) DF1 links are provided on the ports.  User defined commands determine the commands to be issued on each port.  Up to 100 commands can be defined for each port.  Data read from the devices are placed in the virtual database.  Any write requests for the DF1 slave devices are sourced with data from the virtual database.

The module can be configured to place slave devices that are not responding to commands from the master ports at a lower priority.  If the module recognizes that 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 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 network.

If the DF1 master port is configured to support the DF1 half-duplex protocol, the master port can be used to route messages between slaves.  Peer-to-peer communication is accomplished by the master constantly polling all the slaves on the network and relaying the messages received.  The slaves must contain ladder logic with MSG commands to generate and accept messages.  This routing can be used in conjunction with the normal command processing discussed above.

DF1 slave devices can be emulated on the module to interface with remote DF1 master devices.  Each port is configured independently.  Support for half-duplex (master-slave) and full-duplex (point-to-point) DF1 links are provided on the ports.  Simulation of a selected set of functions from the basic, PLC5 and SLC command sets are supported.  Virtual files are mapped to the internal database in the module to provide support of the PLC5 and SLC command sets.

☆型号：5202-DFNT-MCM4 DF1协议主端口 每个端口独立配置

【其他型号推荐】