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2)从工作方式上看,在继电器控制电路中,当电源接通时,电路中所有继电器都处于受制约状态,即该吸合的继电器都同时吸合,不该吸合的继电器受某种条件限制而不能吸合,这种工作方式称为并行工作方式。而plc的用户程序是按一定顺序循环执行,所以各软继电器都处于周期性循环扫描接通中,受同一条件制约的各个继电器的动作次序决定于程序扫描顺序,这种工作方式称为串行工作方式。
3)从控制速度上看,继电器控制系统依靠机械触点的动作以实现控制,工作频率低,机械触点还会出现抖动问题。而plc通过程序指令控制半导体电路来实现控制的,速度快, 程序指令执行时间在微秒级,且不会出现触点抖动问题。
4)从定时和计数控制上看,电器控制系统采用时间继电器的延时动作进行时间控制,时间继电器的延时时间易受环境温度和温度变化的影响,定时精度不高。而plc采用半导体集成电路作定时器,时钟脉冲由晶体振荡器产生,精度高,定时范围宽,用户可根据需要在程序中设定定时值,修改方便,不受环境的影响,且plc具有计数功能,而电器控制系统一般不具备计数功能。
honeywell definite purpose contactor, dp3060b1008
bitronics single demand meter 2, asadc2, shipsameday, 1215c
sumito thermocouple 4.0 dia 134l, ja750504a4, s-5190-75050, 1627b3
telemecanique zb2bw075, zb2-be101, zb2-be102, z-bw07, shipsameday 1627b4
cooper bussmann fhl181-5, 5920-269-3743, dsa900-69-m-ee64, shipsameday, zd8
balluff bes516-326-b0-c, bes-516-326-bo-c,10-30vdc, shipsameday 1616p
bimba 122.5-dxdeh, 1225dxdeh, shipsameday 1229m
allen bradley 634490, rev 6, shipsameday1225y
koganei rad25x30-90-er-ha, air cylinder rad25x3090erha 1631z
allen bradley processor slc 500, 1747-l20b, shipsameday1208b
square d 9001kxsyc5 selector switch operator 30mm type kx, shipsameday 1545r
renata cr2032.ib, cr2032ib, shipsamday d25
timken 376a tapered roller bearing, m4
phoenix contact 2938947, step-sp-100-240ac/24dc/1.5, shipsameday132am
analog devices amp03gsz, amp03gsz-nd, shipsameday, d34
motorola hc573a, cpcr9922, shipsameday1533b3
maxim max3387eeug, lot of 49, shipsameday, d47
swagelok brass cap 6mm, b-6m0-c, b6m0c, shipsameday rack l l74
joucomatic 52000078, 39-553-0098, shipsameday w/2-3 daysshipping134n
fuji electric temperature controller pyx4mcy1-000yc, shipsameday 1539g
fuji electric temperature controller pyx4mcy1-001rc, shipsameday 1539g1
fuji electric temperature controller pyx4mcy1-001rc, shipsameday1539g2
omron temperature controller e5cn-r2t, e5cnr2t, shipsameday1539g4
veeder-root, model t-120506-100, t120506100, 115vac, 60hz, 6w, 101a16
hammond r100-082-000 enclosure wall mount aluminium 1644j
hitachi k12n-epw, k12nepw, nnb, shipsameday w/2-3 days shipping1619a8
trerice b8560408, b85604 50/500f & 10/260c
telemecanique gp2-p32 gp2p32 24-32a shipsameday w2-3dayscshipping1619a10
burkert timer w43ls 1078/1 110/230vac 456178d, 1078/1, w43ls, shipsameday 1625a
wika gauge 232.34, 4.5 160psi 1/2 npt sst lm 9834842 shipsameday w/2-3day135b
telemecanique 3 pole isol load breaker switch v3055171
merlin gerin mg24502, multi c60, d3a, shipsameday 1643a37
datamyte 91708-20 federal max 20ft, 91708-020, 91708, 46-565-5370 1643a68
texas ins ic 1.8v 100ma, tps79118dbvr, 296-11865-1-d, e55
nw25, clamp & centering & elbow nw25, 701001, 710000, box c 1600ak
panasonic cap alum 22uf 16v 20% smd, ece-v1ca220sr, pce3063tr-n r16
allen bradley pilot light, 800mr-pdt16g, 800mrpdt16g, shipsameday1608q
linear ic reg switchd cap 3.3v 8msop, ltc1682ims8-3.3, shipsamedayv2
ge fanuc series one programmable controller, ic610mdl124b
marposs 3419822061 a405 measuring cell 2.5 with cable, 46-701-0215 1643a67
aro cylinder mq-1853-014, mq1853014, shipsameday1471a5
texas instruments ic a/d 15msps 12bit ths1215idw, 296-10010-5-nd
texas instruments ic ldo reg102na-2.8/250, reg102na2.8250ct-nd
rexroth p-187311, mcc ms2-pp, 1.50 x .75, shipsameday rack k k40
spray systems qua-ss (25/40) & qjja-ss, 3/8 npt, shipsameday 1648f
bimba 0411-dp & phd parker cylinder, the cilinder 18d-6, shipsameday
marposs 1024900527 lever support, shipsameday 1645a7
sick optex zt-1200p, zt1200p, shipsameday1618j
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