西门子PLC的顺序控制设计法基本的思想是将系统的一个工作周期划分为若干个顺序相连的阶段，这些阶段称为步(Step)。顺序功能图（SFC）主要由步、有向连线、转换、转换条件和动作组成。
NIB Allen-Bradley 1336-SN-SP7A Inverter Snubber 100HP
Allen Bradley Motor Contactor Starter 100-A45N*3
2 USED PULLOUT ALLEN BRADLEY CONTACTOR 100-A09NZ243
Allen-Bradley Circuit Breaker 100-C37D*00 Lot of 3
ALLEN BRADLEY SLC-100 PROGRAMMABLE UNIT & EXPANSION....
(1) Allen Bradley 140M-I8P-D10-M Circuit Breaker 100A
Allen Bradley 100-B250N*3 Contactor LOT OF 2
ALLEN BRADLEY 1492-100X POWER BLOCK 175AMP 3POLE
Allen-Bradley 1492-CB1 Manual Motor Controller H100
Allen Bradley Contactor 100-C60DJ01 100-C60D
ALLEN BRADLEY (1745-E101) SLC100 EXPANSION UNIT NICE !!
Allen Bradley 100-C09Z*10 Contactor Starter 600V 7.5 HP
Allen Bradley Circuit Breaker 1492-CB2 H100
ALLEN-BRADLEY, SLC 100 PLC, EXPANSION UNIT
Allen Bradley 2100 100 Amp Fusible Motor Control Bucket
Allen-Bradley 100-C09Z*10 Control Relay DIN Rail
ALLEN BRADLEY SLC 100 Programmable controller
Allen Bradley Contactor 100-A75NZ*3, 100A75NZ3 CNC
Allen Bradley 100-C37DJ00 Contactor 3 pole 24 vdc NNB
ALLEN-BRADLEY 100 CONTACTOR-A38
Allen Bradley Contactor 100-A30N*3 & Auxiliary 195-FA40
Allen Bradley Disconnect 1494V-DS100 Ser B 1494VDS100 +
Allen-Bradley 100-A18NZ3 Contactor, 24VDC Coil, 18A
Allen Bradley 100C12A10 Contactor 25amps enclosed
LOT OF 6 ALLEN BRADLEY CONTACTORS CATALOG# 100-C37*00!
Allen-Bradley Circuit Breaker 100-C34D*00 Lot of 4
Allen-Bradley 1492-CB2G100 10 amp circuit breaker
ALLEN BRADLEY DRIVE BOARD D2K 98761-431 SO-63000-100
Allen Bradley Non-Fusible Disconnect Switch 1494V-DS100
Allen Bradley Non-Reversing Contactors 10HP 100-A12ND3
Allen Bradley Non-Reversing Contactor w/ OLR 100-A38ND3
Nice Allen Bradley 500L-DOD93 100 Amp AC Contactor 120
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