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3511 脉冲输入模块
(1) 回路启动顺序由下游向上游(来料方向为上游) , 按延时, 逐个启动, 若回路启动过程中无故障, 则为正常启动; 若有故障则为异常启动, 程序启动遇到故障时, 就不再继续往下启动。
(2) 回路停止顺序由上游向下游, 它包括正常停止和事故停止。正常停止为顺序停止,即正常操作时程序按时间延时由上游向下游逐个停止设备。事故停止是在启动或正常运行过程中回路中某一设备发生故障时, 上游的设备立即停止,下游设备可运行。
(3) 在逻辑梯形图中, 凡是带有分支的联锁回路都有记忆功能。因为前一台设备可以根据需要启动下面的各个分支回路的设备, 回路梯形逻辑的记忆功能, 可保证有故障回路的设备能正确停车。
(4) 上位机能显示出整个皮带运行状态。 亦能显示单条回路运行的设备。
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