1746-0B16
1746-0B16
1746-0B16
虽然工业控制机和可编程技术'>控制器本身都具有很高的可靠性,但如果输入给PLC的开关量信号出现错误,模拟量信号出现较大偏差,PLC输出口控制的执行机构没有按要求动作,这些都可能使控制过程出错,造成无法挽回的经济损失。影响现场输入给PLC信号出错的主要原因有:1、造成传输信号线短路或断路(由于机械拉扯,线路自身老化,连接处松脱等),当传输信号线出故障时,现场信号无法传送给PLC,造成控制出错。2、机械触点抖动,现场触点虽然只闭合一次,PLC却认为闭合了多次,虽然硬件加了滤波电路,软件增加微分指令,但由于PLC扫描周期太短,仍可能在计数、累加、移位等指令中出错,出现错误控制结果。3、现场变送器,机械开关自身出故障,如触点接触不良,变送器反映现场非电量偏差较大或不能正常工作等,这些故障同样会使控制系统不能正常工作。影响执行机构出错的主要原因有:
1、控制负载的接触不能可靠动作,虽然PLC发出了动作指令,但执行机构并没按要求动作。
2、控制变频器起动,由于变频器自身故障,变频器所带电机并没按要求工作。
3、各种电动阀、电磁阀该开的没能打开,该关的没能关到位,由于执行机构没能按PLC的控制要求动作,使系统无法正常工作,降低了系统可靠性。要提高整个控制系统的可靠性,必须提高输入信号的可靠性和执行机构动作的准确性,否则PLC应能及时发现问题,用声光等报警办法提示给操作人员,尽***除故障,让系统安全、可靠、正确地工作。
备货,备货,降降降,火火火,火火火……
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公司名称:厦门泰尼电气有限公司
联系人:小黄(销售代表)
联系电话:0592-6809319
传真号码:0592-6890859(麻烦备注01006收)
手机:18950191386
***号码:2917675397
邮箱:2917675397@***.com
诚信经营,质量为首,诚信至上,泰尼电气小黄竭诚为您服务!!!
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