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3500/05
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电源的调整与保护:对微处理器这个核心部件所需的+5V电源,采用多级滤波,并用集成电压调整器进行调整,以适应交流电网的波动和过电压、欠电压影响。
隔离:在微处理器与输入/输出电路之间,采用光电隔离,有效地隔离输入/输出间电的联系,减少故障和误动作的可能。
联锁:所有输出模块都受开门信号控制,而这个信号只在规定的各种条件都满足时才有效,这样就有效地防止了产生不正常输出的可能性。
采用模块式结构:这种结构有助于故障情况下短时修复。
设置环境检测和诊断电路:这种分电路与软件配合,可以实现灵活保护与故障指示等功能。
②软件措施有:
故障检测:软件定期地检测外界环境,对诸如掉电、强干扰信号等情况能及时进行处理。
信息保护和恢复:对偶发性故障只要故障条件出现时,不破坏PLC内部的信息,一旦故障条件消失,就可恢复正常,继续原来的工作。
设置了警戒时钟WDT:如果程序每循环执行时间超过了WDT规定时间,预示了程序进入循环,立即报警。
加强对程序的检查和检验:一旦程序有错,立即报警并停止执行。
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因此而丢失。
这样,PLC的可靠性、抗干扰能力大大提高。例如美国通用电气公司制成的PC控制模块平均无故障率可达1千万小时之多,组成系统后的平均无故障率可达4至5千万小时。
Allen-Bradley 20BD034A3AYNAND0
GATES PowerGrip Power Grip GT 2 GT2 Double Ribbed Belt TP385014M
GATES 3500-14MGT-85-F
Michelin Cross Terrain tire, 235/65R18, 235 65 18, 235-65-18, 235/65/18
Hoffman A363016LP Enclosure, A-363016LP
INDRAMAT CONTROL BOARD PCU04.2D-16E-50C-AA-GL/CLT01.2C
Hawk 3150-14M-85 HAWK, HTD BELT, 53018301
Gates 3500-14MGT-85
INTRALOX SERIES 1100 FLUSH GRID, GREY, POLYPROPYLENE, BELT 7 x 25'
INTRALOX SERIES 1100 FLUSH GRID POLYPROPYLENE BELT 4 x 25' GD-8921-1
INTRALOX SERIES 4014 85MM
TB Woods V-Belt V Belt Shee 5V10.3X2 5V103X2
INTRALOX SERIES 1100
INTRALOX SERIES 4009 85MM
Goodyear 850H300
TB Woods V-Belt V Belt Shee 7 0X2B-SK
TB Woods V-Belt V Belt Shee 6.8x3B SD 68X3BSD
TB Woods V-Belt V Belt Shee 6.6x4B-SD 664BSD
GATES MULTI-SPEED BELT 2930V348 9833-0727
Goodyear 850H200
Good Year Variable Speed Belt, ORS SC, 1922V443 0516
THOMAS & BETTS 88D ROUND GALVANIZED FLOOR OUTLET BOX P90
INTRALOX SERIES 1100 FLUSH GRID POLYPROPYLENE BELT 4 x 7' GD-8921-1
TB Woods V-Belt V Belt Shee 2HBS.901 2HBS901
Gates 9093-2067 Hi-Power II Powerband V-Belt, B Section, 21/32W, 70L, 13/32H
Goodyear 600H200 Timing Belt NEW 600 H 200 2 wide
TB Woods V-Belt V Belt Shee H.0X2B-SH H0X2BSH H.0X2B SH
TB Woods V-Belt V Belt Shee 3.8X1B SH TZF 3.8 1B SH 3.8X1BSHTZF 3.8X1BSH
Jason AT10660
Jason UniMatch SPB4250
Jason V-belt SPB2800 SPB-2800 Oil and heat resistant 890153
Bando TIMING BELT STS S8M 840 STSS8M 840 1 1/2 wide
NEW JASON T10-690 Speed Control Timing Belt T10690 T10 690 1 WIDE
BROWNING SHEE FHP SINGLE V/BELT BK30H BK 30 H BORE 1 1/2
Goodyear 630H200 Timing Belt NEW 630 H 200 green seal
Goodyear 900H100 Timing Belt NEW 900 H 100 1 wide
Goodyear 900H100 Timing Belt NEW 900 H 100 1 WIDE
Gates Polyflex 11M1060 belt 1/2 wide 11m 1060
Goodyear Torque Flex BX66 V-Belt Matchmaker New BX-66
Goodyear A70 HY-T Plus belt A-70 4L720
GoodYear variable speed belt 890068 1632V210
Goodyear B-78 5L810
Goodyear 450L075 Timing Belt NEW 3/4 WIDE
Optibelt HTD 370-5M Timing Belt 370 5M 3705M
Synchroflex 459 AT5/860
Optibelt STD 632-S8M Timing Belt New STD632-S8M STD632S8M
NEW JASON T10-720 Speed Control Timing Belt T10720 T10 720 1 1/2 WIDE
Goodyear belt HY-T 5UX560
Goodyear 3VX670 HY-T wedge matchmacker belt New Good Year 0919
Goodyear B51 HY-T PLUS B-51 5L540
Goodyear 4L590 FHP
Gates Truflex 2540 A52 1/2 X 54 V-Belt 12.5/13mm X 1370mm 6854
Goodyear 3L530 FHP