公开(公告)号：US5428526A

公开(公告)日：1995-06-27

申请号：US12683

申请日：1993-02-03

Applicant: Mark A. Flood ,  Clay T. White

Inventor： Mark A. Flood ,  Clay T. White

IPC: G05B19/042 ,  G05B11/01

CPC classification number: G05B19/0421 ,  G05B2219/25144 ,  G05B2219/25178

Abstract: A communication module has a backplane interface circuit that enables the module to communicate with other components of the programmable controller, and has a network interface circuit which sends and receives messages via a serial communication link. A memory within the module stores a designation of a starting time, a designation of a length of a message repeat interval, and a file of message information. A clock circuit determines when the starting time occurs and thereafter determines the expiration of each successive occurrence of the message repeat period. A control mechanism responds to the clock circuit determining an occurrence of the starting time or determining an expiration of a message repeat interval, by operating network interface circuit to transmit a message, that contains the message information, over the serial communication link.

Abstract translation: 通信模块具有背板接口电路，使得模块能够与可编程控制器的其他部件进行通信，并具有通过串行通信链路发送和接收消息的网络接口电路。 模块内的存储器存储起始时间的指定，消息重复间隔的长度的指定以及消息信息的文件。 时钟电路确定何时发生开始时间，此后确定消息重复周期的每个连续出现的到期。 控制机制通过操作网络接口电路通过串行通信链路传送包含消息信息的消息来响应确定发起时间的时钟或确定消息重复间隔的期满的时钟电路。