1746-NO4I |
1746-NO4I |
1746-NO4I |
PLC程序结构及实现
2.2.1 本工程根据工艺特点,在PLC编程中采用子程序调用的形式,这样不仅程序可读性强,而且缩短PLC程序扫描周期。以反渗透除盐系统控制程序为例,根据工艺要求反渗透除盐系统控制程序包括反渗透装置阀门上位机软手操控制(ROSoftoperation),反渗透除盐系统备用控制(ROStandby),反渗透除盐系统运行控制(RORunning)和反渗透除盐系统冲洗控制(RORinse)。这四种工作状态在同一时刻是唯一的,我们可将其做成子程序的方式,被反渗透程序(RO)调用。反渗透程序(RO)又和报警程序(Alarm)、泵控制程序(PumpControl)、模拟量处理程序(AD003Setting)、地址转换程序(IOConvert)、液位联锁程序(LevelInterlock)等作为子程序被控制主程序(MainProgram)调用,这样做大大缩短了PLC的扫描时间,而且控制思路清晰,程序可读性强。操作人员只需在上位机上发出简单的指令如,软手操请求、运行请求、冲洗请求等,控制程序即可按照工艺要求步骤对现场设备进行控制。
销售负责人:张亮(工程师) 专线:0592-6809819
24小时移动专线:18030028083 QQ:2314094943 【传真:0592-6890859】
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