3115T XYCOM 控制系统

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3115T XYCOM 控制系统

3115T XYCOM 控制系统

3115T XYCOM 控制系统

CAN即控制器局域网，他的通信具有突出的可靠性、实时性和灵活性。他的应用不再局限于汽车行业，其中CAN在机床数控系统方面实现的功能主要包括：程序管理；机床系统参数输入输出诊断、参数的通讯；机床状态采集；机床工作模式采集；数据库管理等。

目前，国产数控系统的主要份额是经济型机床数控系统。经济型数控系统与机床基本输入输出接口的数量都是有限的，经常不能满足实际操作中的需求，同时在实际车间中，机床与数控系统可能距离较远，输入输出信号在远程传输过程中非常容易受到干扰而出错，而CAN总线在传输较远距离的信号时传输时间短，受干扰概率低，还具有较高的传输速度，基于这些原因本文提出了基于CAN总线的数控系统远程输入输出模块的设计思想。

2 模块结构设计

该模块的组成结构设计如下：CANIN，CANOUT是CAN总线的输入输出接口。DI，DO是模块与机床的接口，DI：机床信息输入接口；DO：来自数控系统的信息输出给机床的接口。且D1，DO接口接收的信息都是开关量信息。

本输入输出模块中的微处理器选用宏晶公司的单片机STC89C516RD+。在CAN总线通信接口中，CAN通信控制器选用SJA1000，CAN总线驱动器采用PCA82C250。由图2 CAN远程输入输出模块硬件原理图可以看出，电路主要由6部分组成：微控制器STC89C516RD+、独立CAN控制器、电气隔离器件6N137、CAN总线驱动器PCA82C250、输出模块和输入模块。微处理器STC89C516RD+负责向输出模块传出要输出的数据，对输入模块的输入点进行扫描输入，以及初始化SJA1000，并通过控制SJA1000实现数据的接收和发送等通信任务。3 模块硬件设计

SJA1000的AD0～AD7连接到STC89C516RD+的P0口，片选信号CS*由P2.7控制，其为0时CPU片外存储器地址可选中SJA1000，进而可对SJA1000执行相应的读／写操作。SJA1000的RD*WR*ALE分别与STC89C516RD+的对应引脚相连，INT*接STC89C516RD+的INT0*，使单片机可通过中断方式对SJA1000进行实时访问。P1口3个端口外接一拨码开关，用来确定自身模块的标识号即该模块的ID号，拨码开关的取值为000～111，所以该ID号的取值为0～7。

输出模块中各输出点通过锁存器74ALS273与STC89C516RD+的P0口相接，并由P2译出的地址以及写信号WR*进行锁存控制。而输入模块中各输入点通过总线缓冲器74ABT245与P0口相连，74ABT245由P2译出的地址以及读信号RD*进行选通控制。这样STC89C516RD+就可以方便地对外部I／O进行访问而无须其他额外的软硬件开支，大大提高了STC89C516RD+的执行效率。为了增强CAN总线节点的抗干扰能力，SJA1000的TX0和RX0并不是直接与PCA82C250的TXD和RXD相连，而是在中间加入了一级高速光耦6N137，这样就很好地实现了总线上各CAN节点间的电气隔离，但前提是光耦部分电路所采用的两个电源VCC和VDD完全隔离，否则就只是利用其响应速度做低通滤波器用。电源的完全隔离可采用小功率的DC-DC，或带多5 V隔离输出的开关电源模块实现。这虽然增加了接口电路的复杂性及成本，但却提高了节点的稳定性和性。

4 模块软件设计

CAN总线数控系统远程输入输出模块的软件设计主要包括6大部分：STC89C516RD+初始化、CAN控制器初始化、报文发送、报文接收、对输出点的输出访问和输入点的扫描输入。本设计应用的CAN的pelic模式的标准帧格式。

程序流程如图3所示。SJA1000初始化只有在复位模式下才能进行，初始化主要包括通过调节拨码开关设置本模块的标识符，工作方式的设置、接收滤波方式的设置、接收屏蔽寄存器(AMR)和接收代码寄存器(ACR)的设置、波特率设置和中断允许寄存器(IER)的设置等。

机床信息传到数控系统：当扫描到机床的输入信号有电平变化时，模块把自身的ID信息和输入信号一起打包成标准帧发送给数控系统。

数控系统指令传到机床：模块实时总线，当总线上有来自数控系统的信息，启动CAN接收，根据AMR和ACR来判断是否该接收该指令帧，如果不应该接收，将信息丢弃，如果应该接收，将指令输出给机床。

在实际应用中，多块输入输出模块相连接组成CAN的网络，多块输入输出模块的上位机都是机床数控系统，各模块的输入输出接口均与机床相连如图4所示。5 模块

由于各模块的ID号的取值为0～7，所以本设计数控系统外部可扩展8个输入输出模块，其中各个模块ID号设置不能相同，且站号越小，优先级越高。在本设计中每个模块的输入点为64个，输出点为64个，则一共可以扩展到512(64*8)个输入输出点。注意在该网络中，在总线的两端应各接有一个终端电阻，终端电阻的作用是吸收信号线上电脉冲的多余能量，防止反射形成信号混淆，而信号混淆将导致通讯错误。

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