变频器控制方式特点：
其特点是控制电路结构简单、成本较低，机械特性硬度也较好，能够满足一般传动的平滑调速要求，已在产业的各个域得到广泛应用。但是，这种控制方式在低频时，由于输出电压较低，转矩受定子电阻压降的影响比较显著，使输出大转矩减小。另外，其机械特性终究没有直流电动机硬，动态转矩能力和静态调速性能都还不尽如人意，且系统性能不高、控制曲线会随负载的变化而变化，转矩响应慢、电机转矩利用率不高，低速时因定子电阻和逆变器死区效应的存在而性能下降，稳定性变差等。因此人们又研究出矢量控制变频调速。
S7-1200通信和程序的特点：
S7-1200是西门子的新一代的控制器，在串口通信方面在硬件与软件方面都与S7-200不同：通讯方面：作为200的升产品，1200不支持DP等应用比较广泛的通讯协议，但保留了强大的自由口通讯功能；程序方面：引入块概念，更接近于300，编程方便，尤其是通讯方面的编程（自由口、MODBUS等，一个块可以控制多个驱动器，不同电机的数据存储在不同的数据库中；硬件方面：S7-1200现有的几款PLC都可以扩展3个串口通信模板（即可以全部是RS232接口，也可以全部是RS485接口，也可以是两种接口的组合），而S7-200这不可以进行扩展，只能用本体上的RS485口，在这一点上功能强了。软件方面：S7-1200，在编程上与S7-300的编程方法类似，组态完硬件接口，直接调用功能块就可以，非常简单，不像S7-200需要对SM进行操作。S7-1200与S7-300在串口通信比较起来基本上一样，但在作Modbus的通信时不需要额外的Dongle来支持。
Allen Bradley 505-TOD Size 00 Starter 505TOD 120/110 VAC Coil T0D 500-TOD94
Allen Bradley 505-TOB-A1F Reversing Starter 110/120 VAC Coil 505-T0B-A1F
Allen Bradley 505-T0D-A1D Reversing Starter 110/120 VAC Coil 505-TOD-A1D
Allen Bradley 505-AO* Size 0 592-A1DA Motor Starter 505AO* 115-120 VAC 592A1DA
Allen Bradley 500L-COD94 60 Amp Contactor 120/110 VAC Coil 40420-452-04
Allen Bradley 500L-COD94 115-120 VAC Coil 60 Amp Contactor 500L-C0D94
Allen Bradley 500L-COD93 115-120 VAC Coil 60 Amp Contactor 500L-CO*93
Allen Bradley 500L-COD93 115-120 VAC Coil 60 Amp Contactor 500L-C0D93
Allen Bradley 500FL-EOD92 200 Amp Contactor 115-120 VAC Coil 500FL-E0D92
Allen Bradley 500FL-COD93 60 Amp Contactor Starter 115-120 VAC Coil 500FL-C0D93
Allen Bradley 500FL-C0*93 60 Amp Contactor Starter 115-120 VAC Coil 500FL-CO*93
Allen Bradley 500F-EOB930 Size 4 Contactor Starter 460-480 VAC Coil 500F-E0B930
Allen Bradley 500F-DOD930 Size 3 Contactor Motor Starter 500FDOD930 115-120 VAC
Allen Bradley 500F-DO*930 Size 3 Contactor Motor Starter 500F-DOD930 115-120 VAC
Allen Bradley 500F-COD930 Size 2 Contactor Starter 115-120 VAC Coil 500FCOD930
Allen Bradley 500-EOD930 Size 4 Contactor Starter 110/120 VAC Coil 500-E0D930
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Allen Bradley 500-DOA930 Size 3 Motor Starter 500DOA930 230-240 VAC Coil
Allen Bradley 500-A0B94 Size 0 Motor Starter 500A0B94 460-480 VAC Coil AOB94
Allen Bradley 49099-C 709-COD Size 2 Reversing Part Winding Starter 120/110 VAC
Allen Bradley 45DLA-1LEB2E-F4 Emitter 45DLA1LEB2EF4
Allen Bradley 440T-MRPSE11MA Trapped Key Module M221-SE4612 M221-24475
Allen Bradley 440T-MRPSE11JA Trapped Key Module M221-SE4612 M221-24475
Allen Bradley 440R-N23125 MSR127T Guard Master 115 VAC Safety Relay Ser B
Allen Bradley 440R-N23119 MSR126.1R Guard Master 115 VAC Safety Relay
Allen Bradley 440R-J23045 Minotaur MSR11R 110 VAC Safety Relay 440RJ23045
Allen Bradley 440R-J23045 Minotaur MSR11R 110 VAC Safety Relay 440RJ23045
Allen Bradley 440R-G23029 GuardMaster AC/DC Safety Relay MSR10R/D MSR10 RD
Allen Bradley 440R-D23025 Minotaur MSR7C 110 VAC Safety Relay Ser A 440RD23025
Allen Bradley 440R-D22S2 GSR DIS Guard Master 24 VDC Safety Relay Ser A 201
Allen Bradley 440R-D22S2 GSR DIS Guard Master 24 VDC Safety Relay Ser A 200
Allen Bradley 440N-Z21S26B Guardmaster Sensor & Actuator Ser A Rev D
Allen Bradley 440N-G02095 B FRS-6 Safety Sensor Ferrogard 6 Guard master
Allen Bradley 440K-MT55066 Safety Interlock Switch Guard Master 440KMT55066
Allen Bradley 440F-C251D Guardmaster Safedge Control Unit 440FC251D
Allen Bradley 43GR-TBS15SL Glass Fiber Optic Cable 43GRTBS15SL
Allen Bradley 42KC-P2LNSM-P4 Photoswitch 12-24 VDC 42KCP2LNSMP4
Allen Bradley 42GTGF-10000-02 Photoelectric Photo Switch 42GTGF1000002 42GTGF
Allen Bradley 42DRA-5000 Photoelectric Photo Switch 42DRA5000 42DTB-5000 42DTB
Allen Bradley 42DRA-5000 Fiber Optic Photo Switch 42DRA5000 42DTB-5000 42DTB
Allen Bradley 42CRC-4001 Color Registration Photoswitch 20-30 VDC 42CRC4001
Allen Bradley 40193-415-52 Pilot Switch Assembly 800S 4019341552 (JK)
Allen Bradley 40104-401-01-3036 Size 4 Motor Starter 120/110 VAC 74A86 401044010
Allen Bradley 40023-441-10 Disconnect Fuse Block 600 V 60 Amp 4002344110
Allen Bradley 40021-567-02 3 P Disconnect Switch 60 Amp 600 V 40023-441-13
Allen Bradley 280D-FN-10-C ArmorStart Control Module 284D-FVD4P0Z-10-CR-SB-EMI
Allen Bradley 280D-FN-10-C ArmorStart Control Module 284D-FVD2P3Z-10-CR-A10-OC
Allen Bradley 280D-FN-10-C ArmorStart Control Module 284D-FVD1P4Z-10-CRW-EMI
Allen Bradley 280D-FN-10-C ArmorStart Control Module 284D-FVD1P4Z-10-CR-SB-EMI
Allen Bradley 2801-MVM Machine Vision Monitor Ser A Rev A 2801MVM
Allen Bradley 2755-SN5 Ser B Rev A AdaptaScan Scanner 2755SN5
Allen Bradley 2755-SN5 Ser B Rev A AdaptaScan Scanner 2755-NB40 2755SN5
Allen Bradley 2755-SN5 Ser B Rev A AdaptaScan Laser Scanner 2755SN5
