1SFA663001R1001
1SFA663001R1001
1SFA663001R1001
（2）软件方面：
PLC的工作方式为扫描加中断，这既可保证它能有序地工作，避免继电控制系统常出现的"冒险竞争"，其控制结果是确定的；而且又能应急处理急于处理的控制，保证了PLC对应急情况的及时响应，使PLC能可靠地工作。
为监控PLC运行程序是否正常，PLC系统都设置了"看门狗"（Watchingdog）监控程序。运行用户程序开始时，先清"看门狗"定时器，并开始计时。当用户程序一个循环运行完了，则查看定时器的计时值。若时（一般不过100ms），则报警。严重时，还可使PLC停止工作。用户可依报警信号采取相应的应急措施。定时器的计时值若不时，则重复起始的过程，PLC将正常工作。显然，有了这个"看门狗"监控程序，可保证PLC用户程序的正常运行，可避免出现"死循环"而影响其工作的可靠性。
◆ 企业名称：厦门泰尼电气有限公司
◆ 主营业务：DCS,PLC
◆ 经营模式： 贸易
◆ 贸易地区：
◆ 联系人： 小黄《女士》
◆ 电话：
◆手机：
◆ QQ:2917675397
◆ 传真： （备注“01006”收）
◆ E-mail： 2917675397@qq.com
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