ICS TRIPLEX T3419
生活中其实没有绝境,绝境在于你自己的心没有打开。
PLC控制系统的地线包括系统地、屏蔽地、交流地和保护地等。接地系统混乱对PLC系统的干扰主要是各个接地点电位分布不均,不同接地点间存在地电位差,引起地环路电流,影响系统正常工作。例如电缆屏蔽层必须一点接地,如果电缆屏蔽层两端A,B都接地,就存在地电位差,有电流流过屏蔽层,当发生异常状态如雷击时,地线电流将更大。
此外,屏蔽层、接地线和大地有可能构成闭合环路,在变化磁场的作用下,屏蔽层内又会出现感应电流,通过屏蔽层与芯线之间的耦合,干扰信号回路。若系统地与其他接地处理混乱,所产生的地环流就可能在地**产生不等电位分布,影响PLC内逻辑电路和模拟电路的正常工作。PLC工作的逻辑电压干扰容限较低,逻辑地电位的分布干扰容易影响PLC的逻辑运算和数据存储,造成数据混乱、程序跑飞或死机。模拟地电位的分布将导致测量精度下降,引起对信号测控的严重失真和误动作FURNAS ELECTRIC CO 3RV1915-1CB
FURNAS ELECTRIC CO 3RV1915-2CB
FURNAS ELECTRIC CO 3RV1915-3CB
FURNAS ELECTRIC CO 3RV1915-5A
FURNAS ELECTRIC CO 3RV1917-1A
FURNAS ELECTRIC CO 3RV1917-4A
FURNAS ELECTRIC CO 3RV1917-4B
FURNAS ELECTRIC CO 3RV1917-5BA00
FURNAS ELECTRIC CO 3RV1917-6A
FURNAS ELECTRIC CO 3RV1922-1CV1
FURNAS ELECTRIC CO 3RV1923-1CA00
FURNAS ELECTRIC CO 3RV1923-1DA01
FURNAS ELECTRIC CO 3RV1923-4B
FURNAS ELECTRIC CO 3RV19260B
FURNAS ELECTRIC CO 3RV1926-2B
FURNAS ELECTRIC CO 3RV1927-5AA00
FURNAS ELECTRIC CO 3RV1928-1H
FURNAS ELECTRIC CO 3RV2011-0HA20
FURNAS ELECTRIC CO 3RV2011-4AA10
FURNAS ELECTRIC CO 3RV2711-1CD10
FURNAS ELECTRIC CO 3RV2811-0DD10
FURNAS ELECTRIC CO 3RV2901-1A
FURNAS ELECTRIC CO 3RV2917-5E
FURNAS ELECTRIC CO 3RW2120-1AA01
FURNAS ELECTRIC CO 3RW3024-1AB05
FURNAS ELECTRIC CO 3RW3024-1AB15
FURNAS ELECTRIC CO 3RW3026-1AA12
FURNAS ELECTRIC CO 3RW3036-1AB05
FURNAS ELECTRIC CO 3RW3045-1AB14
FURNAS ELECTRIC CO 3RW3926-8A
FURNAS ELECTRIC CO 3RW4036-2BB15
FURNAS ELECTRIC CO 3RW4047-1BB15
FURNAS ELECTRIC CO 3RW4075-6BB34
FURNAS ELECTRIC CO 3RW4075-6BB44
FURNAS ELECTRIC CO 3RW4076-6BB35
FURNAS ELECTRIC CO 3RX01ST1
FURNAS ELECTRIC CO 3RX1-505
FURNAS ELECTRIC CO 3RX1516
FURNAS ELECTRIC CO 3RX1524
FURNAS ELECTRIC CO 3RX1-536
FURNAS ELECTRIC CO 3RX1546
FURNAS ELECTRIC CO 3RX1577
FURNAS ELECTRIC CO 3RX1578