点击图片查看原图
⑴ 组成器件不同：继电器控制线路是许多真正的硬件继电器组成，而梯形图则由许多所谓“软继电器”组成。
⑵ 触点数量不同：硬继电器的触点数量有限，用于控制的继电器的触 点数一般只有4～8对；而梯形图中每个“软继电器”供编程使用的触点数有无限对。
⑶ 实施控制的方法不同：在继电器控制线路中，实现某种控制是通过各种继电器之间硬接线解决的。而plc控制是通过梯形图即软件编 程解决的。
⑷ 工作方式不同：在继电器控制线路中，采用并行工作方式；而在梯形图的控制线路中，采用串行工作方式。
Lot of (28) CARBOLOY VNMG-432E 48 CARBIDE INSERTS _ 570
SATA 2nd Hard Drive HDD Caddy Adapter For Lenovo IdeaPad G560 G565 G570 G575
GP570-LG21-24V PRO-FACE OPERATOR PANEL ID1253
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Siemens Circuit Board 570 548 9102.00 Rev A_570548910200_570548.0002.00
TEK-AIR VORTEK AIR FLOW TRANSMITTER T-PVT2121-07
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6 RA 262B-6DV57-0 D380/90 6RA262B6DV570D38090 SIMOREG SIEMENS ID3096
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NEW SHIMANO TEKOTA 300 SALTWATER REEL
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ABB Serial measurement board; DSQC 562, Part# 3HAC17396-1 aka 3HAC031851-1
ABB DSQC626A 3HAC026289-1 IRC5 DSQC 626 3HAC 020465-001 upgraded
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NEW ABB 3HAC15899-1 CABLE ConNECTOR XT58.2 XP57 3HAC022190-001
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3HAC 0759-1 INTERNAL BLEEDER R1.X12, NEW*
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ABB 3HAC6382-1 & 3HAC6383 EPROM CHIPS Y2K-D62 Y2K-D63
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ASEA BROWN BOVERI 3HAC2424-1 NSPP 3HAC24241
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PIAB VACUUM PRODUCTS 3HAC-7966-1/00 USPP 3HAC7966100
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ABB/Elmo motor on Irb 4400 Axis 1 #3hac5009-1
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NEW ABB 3HAC7017-1 COVER
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DSQC509 3HAC5687-1/0609622#1573852
