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PLC是一种用于工业生产自动化控制的设备,一般不需要采取什么措施,就可以直接在工业环境中使用。然而,尽管有如上所述的可靠性较高,抗干扰能力较强,但当生产环境过于恶劣,电磁干扰特别强烈,或安装使用不当,就可能造成程序错误或运算错误,从而产生误输入并引起误输出,这将会造成设备的失控和误动作,从而不能保证PLC的正常运行。要提高PLC控制系统可靠性,一方面要求PLC生产厂家提高设备的抗干扰能力;另一方面,要求设计、安装和使用维护中引起高度重视,多方配合才能完善解决问题,有效地增强系统的抗干扰性能。因此在使用中应注意以下问题:
(1)温度:PLC要求环境温度在0~55℃,安装时不能放在发热量大的元件下面,四周通风散热的空间应足够大。
(2)湿度:为了保证PLC的绝缘性能,空气的相对湿度应小于85%(无凝露)。
(3)震动:应使PLC远离强烈的震动源,防止振动频率为10~55 Hz的频繁或连续振动。当使用环境不可避免震动时,必须采取减震措施,如采用减震胶。
(4)空气:避免有腐蚀和***的气体,例如化学的酸碱等。对于空气中有较多粉尘或腐蚀性气体的环境,可将PLC安装在封闭性较好的控制室或控制柜中。例如电厂的干排渣、干除灰等,在基建后期增加了封闭小屋。
(5)电源:PLC对于电源线带来的干扰具有一定的***能力。在可靠性要求很高或电源干扰特别严重的环境中,可以安装一台带屏蔽层的隔离变压器,以减少设备与地之间的干扰。一般PLC都由直流24 V输出提供给输入端,当输入端使用外接直流电源时,应选用直流稳压电源。因为普通的整流滤波电源,由于纹波的影响,容易使PLC接收到错误信息。
Dollinger cartridge filter housing GP 206-60 2" 50mm flanged adapters
Donaldson ultrafilter HD 0048 BSP 64bar high pressure stainless filter
Mistubishi Melsec PLC A2ASCPU only
Mistubishi Melsec PLC A1SX80 DC input module
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Electronic Teaching Lab Board with Light and Banana Plugs Quantity of 4 + switch
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Allen Bradley MicroLogix 1000 PLC Controller Ser E FRN1.0 1761-L32BWA
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Modicon AS-S908 remote i/o processor
industrial hydraulic Disc Brake Calipers
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John Zink Gas Burner Tip DB6-1/2" inch APBZ-0266 4 in pack stainless SP101592
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Drawer Type Camera Case Road Case Professional Video
Modicon AS-B838-032 24VDC output module
Air bore gauge comparator on stand
M24 Turn***les Very Large Minimum Purchase of 2
Modicon AS-B805-016 115V input module
Modicon AS-B804-016 115V output module
Comnia Sheffield 1.2877 inch air shaft comparator gauge
Rack Mount IFB Switching Unit
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Sheffield air gauge comparator
Sheffield Model 5000 air gauge comparator
Sheffield model 10000 Column Type Precision air gauge comparator
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Komatsu Bowden Cable 3097216M
vu-thru 11 TRW Hartzell Propeller Model C-4670 ***iation Equipment
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