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有极强的自检及保护功能。
①故障检测——软件定期地检测外界环境，如掉电、欠电压、锂电池电压过低及强干扰信号等。以便及时进行处理。
②信息保护与恢复——当偶发性故障条件出现时，不破坏PLC内部的信息。一旦故障条件消失，就可恢复正常，继续原来的程序工作。所以，PLC在检测到故障条件时，立即把现状态存入存储器，软件配合对存储器进行封闭，禁止对存储器的任何操作，以防存储信息被冲掉。
③设置警戒时钟WDT（看门狗）——如果程序每循环执行时间超过了WDT规定的时间，预示了程序进入死循环，立即报警。
④加强对程序的检查和校验——一旦程序有错，立即报警，并停止执行。
⑤对程序及动态数据进行电池后备——停电后，利用后备电池供电，有关状态及信息就不会丢失。
PLC的出厂试验项目中，有一项就是抗干扰试验。它要求能承受幅值为1000V，上升时间1nS，脉冲宽度为1μS的干扰脉冲。一般，平均故障间隔时间可达几十万～上千万小时；制成系统亦可达4～5万小时甚至更长时间。
Lenze Servo Drives 9400 Type: E94AZPS0034
Lenze Bremseinheit Type: EMB8253-E
Lenze Type: EMB8251-E
Lenze Beipack Zubehr - Klemmen / 00390470
Lenze Controller p300 Type: P30GAH80300F3G0XXX
Lenze Digitec Controls 106AT19540 / IP0001 15"
Lenze Digitec Controls 104AT15989 / EL5000 15"
Lenze Operator Panel Type: EPM-H505 HW.SW: 1C10
Lenze EPM-H605 Touchscreen
Lenze PC system bus adapter Type: EMF2177IB
Lenze PC system bus adapter Type: EMF2177IB
Lenze Operator Panel Type: EPM-H502 / HW.SW: 1B.10
Lenze Operator Panel Type: EPM-H502 / HW.SW: EPM-H502
Lenze Servo Drives 9400 Diagnoseadapter Type:E94AZCUS
Lenze DrivePLC / ServoPLC / ECS
Lenze Diagnose Handterminal Type: EMZ9372BB / 33.9372B
Lenze SERVO Drives 9400 1 x Profibus Type: E94AYCPM/S
Lenze Systembus CAN-Repeater Type: EMF2176IB.1C
Lenze Keypad für Lenze 8200/Vector/Motec 9300 u
Lenze Braking Chopper Type:EMB6032-G
Lenze Lecom-A/B Type: 2102 IBC V001 Inkl.
Lenze Modem CAN Type: EMF2181IB
Lenze Kommunikationsmodul Type: EMF2103IB
Lenze LECOM A/B 2102 Type: 33.2102IB.V001
Lenze Card Module Type: EMZ2221IB
Lenze Servo Drives 9400 Safety Module Type:E94AYAE
Lenze LECOM A/B Type: 2102 IBC V001
Lenze CANopen Modul EMF2178IB
Lenze EPM PROGRAMMER Type: ESMD01EPOA
Lenze EthernetCAN Type: EMF2180IB
Lenze Diagnosis terminal X400 Type: EZAEBK2001
Lenze Card Module Type: EMZ2221IB
Lenze Servo Drives 9400 Safety Module Type:E94AYAB
Lenze SERVO Drives 9400 1xProfibus Type: E94AYCPM
Lenze LECOM A/B Type: 2102 IBC V001
Lenze Kommunikationsmodul Type: EMF2191IB
Lenze BEDIENMODUL Type:EMZ8201BB
Lenze Global Drive I/O-SYSTEM Type: ETCHI008ACB
Lenze Profibus DP Type: 2133 IB
Lenze Servo Drives 9400 Safety Module Type:E94AYAB
Lenze Interbus Type: 2113 IB
Lenze PROFIBUS Type: E82ZAFPC001
Lenze Kommunikationsmodul LECOM - A Type: EMF2102IB-V00
Lenze CANopen Modul EMF2178IB
Lenze PROFIBUS PT Type:E82ZAFPC010
Lenze EtherCAT Extension Module 8200/9300 Type: EMF21
Lenze Servo Drives 9400 E94AYM34/S Memory Module MM34
Lenze Servo Drives 9400 Safety Module 1xSMO E94AYAA
Lenze EtherCAT Extension Module 8200/9300 Type: EMF21
Lenze HANDTERMINAL KEYPAD E82 B Type: E82ZBB + E82
Lenze HANDTERMINAL KEYPAD Type: E82ZBB Inkl. E82ZWL02
Lenze Funktionsmodule BUS für motec M2-M3 TYPE: E82Z
Lenze Servo Drives 9400 E94AYM34 Memory Module MM340
Lenze Handterminal Keypad E82 B Type: E82ZBB
Lenze Servo Drives 9400 Safety Module 1xSMO Type: E94
Lenze Type: EPM-T830 / EPM-T830.1B.12
Lenze Funktionsmodul Interbus Type: EMF2113IB
Lenze HANDTERMINAL KEYPAD Type: E82ZBB Inkl. E82ZWL02
LENZE SYSTEMBUS CAN-REPEATER EMF2176IB
Lenze BEDIENMODUL KEYPAD XT Type:EMZ9371BC
Lenze LECOM B Type: EMF2102IB-V002
Lenze LECOM B Type: EMF2102IBCV002
Lenze Servo Drives 9400 Extension Module Type:E94AYCEN
Lenze EtherCAT module Type: E84AYCETV
Lenze APPLICATION Type: E82ZAFAC
Lenze Type: EPM-T210 / EPM-T210.1B
Lenze HANDTERMINAL Type: EMZ 8272BB-V001
Lenze I/O Modul Type: EMZ8275IB
Lenze CAN Modul Type: EMF2171 IB
Lenze Modem CAN Type: EMF2181IB
Lenze EZAEBK1001 Keypad X400
Lenze HANDTERMINAL KEYPAD Type: E82ZBB
Lenze HANDTERMINAL Type: EMZ8272BB.V001
Lenze BEDIENMODUL SERVO 9300 Type: EMZ9371BB
Lenze BEDIENMODUL Type:EMZ8201BB
Lenze Bedienmodule Type:EMZ8201BB
Lenze BEDIENMODUL Type: EMZ9371BB1A
Lenze EZAEBK1001 Keypad X400
Lenze APPLICATION Type: E82ZAFA
Lenze APPLIKATION Funktionsmodul Type: E82ZAFAC001
Lenze Servo Drives 9400 Speichermodul MM330 Type: E94AY
Lenze Device Net CANopem Module Type:E82ZAFD
Lenze Funktionsmodule STANDARD - I/O Type: E82ZAFS
