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柯 丽 梅
: :
利用数据通信接口进行数据传送和显示,是实现PLC数据显示的有效途径。目前主流PLC均提供标准的RS-232或RS一485/422接口,或者通过模块扩展增加此类接口。
三菱FX2N的通信模块232ADP,232BD,485BD和485ADP均可作为数据接口。显示装置可选用智能显示屏和通用计算机(PC).直接选用和PLC配套的显示屏或触摸屏,可实现PLC内部多个数据的集中显示,并可利用编辑软件编辑屏幕图形,提高显示界面的可视性。FX系列可配套的显示屏有F93000T一BWD,F940GOT一LWD和F940GOT-SWD。智能显示屏通过通信接口读取PL的寄存器,数据显示效率高,同时可简化控制系统的设计。但由于显示器的高成本,限制了大尺寸显示屏的应用,因此该方法适合于紧凑型的PLC控制系统。随着计算机性能和可靠性进一步提高,"PC+PLC”模式的控制系统在工业控制领域得到广泛应用,PC机凭借丰富的软硬件资源,可实现PLC的在线监测,集中显示大量的PLC内部数据,能以图形化的方式显示控制设备的动态工艺流程和数据趋势曲线,使系统的人机界面直观友好。
PLC与组太王的通信连接
1:1一个站,距离〈15米,用编程口驱动
通过编程口通信(plc不需要进行编程)
1:N多个站(zui多16个站),50米>距离>15米,用FX485驱动
1:N多个站(zui多16个站),500米>距离>50米,用FX485驱动
1:N多个站(zui多16个站),1200米>距离>500米,用FX485驱动(加485中继)
RS485的连线可以是一对或两对导线。根据用途来决定连线的方法,本设计采用的是两对导线连接方式。
为了建立PLC与组太王的通信连接,可以在PLC编程软件的菜单“PLC/串行口设置”中设置通信地址和通信参数,也可以在软件中直接用编程(MOV指令)来实现,按RS485规定具体设置是:
波特率设为9600bit/s,数据位设为7位,l位起始位,2位停止位,偶校验,采用协议1。用编程软件设置,其中在D8121中设置通信地址。
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