少年听雨歌楼上，红烛昏罗帐。壮年听雨客舟中，江阔云低，断雁叫西风。
而今听雨僧庐下，鬓已星星也。悲欢离合总无情，一任阶前，点滴到天明。
可编程控制器(PLC)顺序功能图（SFC）的组成和使用
顺序功能图，亦称功能流程图或状态转移图，是一种图形化的功能性说明语言，专用于描述工业顺序控制程序，也是IEC61131-3的标准编程语言。使用它可以对具有并发、选择等复杂结构的系统进行编程，一些高档的PLC提供了用于SFC编程的指令，但一些低档的PLC并不支持SFC编程语言。顺序功能图示例如图1所示。 顺序功能图主要由“状态”和“转移”等基本元素组成。通过这些基本元素的不同组合，可以表达各种各样的复杂顺序控制逻辑，控制规律的表达简洁明了。 状态有时也称步，是系统一个相对稳定的阶段，在这阶段内系统的参量保持不变。系统的参量一旦发生变化，则认为系统转移到了一个新的状态。状态包括初始状态和工作状态，一个系统至少要有一个初始状态，初始状态用双线矩形框表示，工作状态用矩形框表示，工作状态一般都有相对应的动作。每个状态都有一个编号，通常用PLC内部的状态元件来保存状态。 当系统的参量发生变化到了一个新的状态，则认为系统状态发生了转移。转移由连接两个状态之间的有向线段和垂直于此线段的短横线段组成，短横线段表示发生转移的条件。 图1 PLC顺序功能图
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BOSCH/REXROTH/INDRAMAT RME12.2-32-DC024 RECO INTERBUS INPUT MODULE ***NIB***
Mannesmann, Rexroth, 24vdc 4Way Solenoid R900978280
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Rexroth R900941212 Hy-Directional Spool Shutoff Valve
Rexroth Prop Amplifier Board VT5011 S31 R1 #24645
Rexroth Prop Amplifier Board VT5011 S30 R5 #24646
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REXROTH R900938073 LFA 40 D-71/F CARTRIDGE VALVE NEW
LOT OF 9 MECMAN REXROTH PW67697-1 *NEW IN BOX*
NEW REXROTH R900928826 LOGIC CARTRIDGE LC 63 A20E7X
Rexroth Sigma 1PF2G330/032RA07MS/399090 00, M23I, New Surplus Has Cosmetic Issue
NIB Lot of (6) Bosch Rexroth_261-108-120-0 _ 049-384-591-8 _ 261-707-016-0
REXROTH DPR-10 Digital Amplifier
REXROTH P68186-3080 PNEUMATIC CYLINDER 4" BORE X 8" STR
REXROTH HYDRONORMA GL 62 0 A 061 125 VDC SOLENIOD COIL GL62-0-A
R911325864, BRC, Bosch Rexroth, LEM-AB-116T-11-NNNN
REXROTH R901106262 NSFP R901106262
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REXROTH LC25DB40D7X NSFP LC25DB40D7X
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