對(duì)可靠性要求較高的應(yīng)用場(chǎng)合，冗余設(shè)計(jì)和降級(jí)操作是必要的。冗余設(shè)計(jì)可采用熱后備或冷后備方式。熱后備方式操作時(shí)，冗余的后備系統(tǒng)也同時(shí)運(yùn)行，兩者輸出的結(jié)果*時(shí)，表示系統(tǒng)是正常運(yùn)行的；一旦結(jié)果不*，則發(fā)出警報(bào)信號(hào)，同時(shí)，根據(jù)自診斷的結(jié)果，切換到正常的系統(tǒng)去。冷后備方式操作時(shí)，冷后備系統(tǒng)不運(yùn)行，它在自診斷檢測(cè)出運(yùn)行系統(tǒng)故障后才切入后備系統(tǒng)。對(duì)PLC來(lái)說(shuō)，冗余系統(tǒng)的范圍主要是CPU、存儲(chǔ)單元、電源系統(tǒng)和通信系統(tǒng)，只有在可靠性要求很高時(shí)，才會(huì)包括輸入輸出單元的冗余等。

Applied Motion 5023-124D 5023124D Step Motor

Applied Motion Products 5560 Step Motor Drive

Super Vexta UDX5107 5-Phase Driver

Sanyo Denki 03-2316-5590 0323165590 Step-Syn Stepping Motor

Lot 4pcs ASAHI KEIKI APS-250-1 5V DC POWER SUPPLY

Oriental Motor PH566-B PH566B 5Ph Stepping Motor

Vexta Oriental UDK2112 2 Phase Driver

ES Driver Q2HB44MC 2-Phase Stepper Motor Driver

Pack Driver AK-X140B AKX140B Stepping Motor Driver

Oriental Motor PH544-NA PH544NA 2PH Stepper Motor

Parker Compumotor OEM 83-93-MO 8393MO 71-013089-01 Step Motor

Pacific Scientific P21NRXF-LNF-NS-?00 P21NRXFLNFNS00 1.8 Stepping Motor

Vexta PK564NBW 5 Phase Stepping Motor

Vexta UD2140 2-Phase Driver

Isomet D301B-856 D301B856 Acousto-Optic Deflector Driver

Vexta PK268-03B PK26803B Stepping Motor

Oriental Motor EM569-NB EM569NB 5 Ph Step Motor DC 1.4A

Vexta Oriental UD2115 2-phase Driver

Oriental Motor PH554-B2 PH554B2 5Ph Stepping Motor

Oriental Motor UDK5128NW2 5-Phase Driver 100-115-8A 50/60Hz

Oriental Motor 0RK1GN-A w/ 0GN120K Gear Head

Saehan 4S56Q-03076W 4S56Q03076W Stepping Motor

Oriental Motor PH544-A PH544A 5 Ph Step Motor DC 0.75A

Oriental Motor UDK2109 2-Phase Driver

Berger Lahr VRDM 566/50 LNA VRDM56650LNA Stepper Motor 1.2A

Glas-Col Heating Mantle Controller 2400W 240V

Panther IMS Stepper Motor Controller

Applied Motion HT23-401 HT23401 Stepper Motor

Oriental Motor FSP200-2 FSP2002 Speed Controller 200-230V

Powermax II M22NSXC-LDN-NS-?02 M22NSXCLDNNS02 Step Motor 1.55A 70W

Vexta PK543-A PK543A 5-Phase Stepping Motor w/ THK KR20

Sanyo Denki 103H7123-0440 103H71230440 Stepper Motor DC2A

Sanyo Denki 103H7126-5530 Step-Syn Stepping Motor DC 3A

Eastern Air Devices LA23DGK-1R5 LA23DGK1R5 Stepping Motor

Applied Motion HT23-398D HT23398D Stepper Motor

Fastech FAS-2SD-MU316 FAS2SDMU316 2 Phase Microstep Drive

Superior Electric KML063F04 Step Motor

Oriental Motor UDK5214NW 5 Phase Driver

Oriental Motor Vexta 0RK1GN-A 0RK1GNA Reverse Motor

Panasonic MSM5AZP1E Motor

Pack Driver AK-BX501L AKBX501L Stepping Motor Driver

Mitsubishi MR-J2-40A MRJ240A AC Servo Drive C

Super Vexta UDK5114N-A11 5-Phase Driver

Inligent Motion M2-2232-D M22232D Stepping Motor

Nemic-Lambda RWS200A-15 RWS200A15 Power Supply

Vexta UPH5913H-A UPH5913HA 5-Phase Stepping Motor

Pittman GM9413H875 M2-015 M2015 Motor

Mycom SD45-230 SD45230 Stepping Driver

Superior Electric M112-FD09 M112FD09 Slo-Syn Stepping Motor New Open Box

Oriental Motor UDK2120A 2-phase Driver