临时欠编
本安型现场总线控制系统应用时应注意下列事项:
1.屏蔽线在现场仪表处不连接到仪表
2.中继器与电源调整器之间的最大距离受最大传输长度(对A类电缆为1900m)和连接的分支电缆长度的约束。
3.为便于设备的散热,安装多个现场总线电源调整器时应保持设备之间的距离大于30mm。
4.本安应用时,除了直接使用本安型电源调整器外,也可采用非本案的电源调整器和本安栅。例如,用MTL5053电源调整器和MTL791本安栅等。
5.电源调整器MTL5053应安装在安全区域,在电源调整器内部将终端切到ON,作为网段的一个终端器。另一个终端器在相应网段的另一端。
6.从MTI5053到现场接线盒及现场仪表的接线作为危险区的接线,它们应与安全区的接线分开,包括屏蔽线也应分开,其最大长度根据所挂接现场设备而定。例如,图中挂接4台现场仪表,采用A类电缆最大长度是170m。表6-19显示本安供电时的电缆最大长度。当设备耗电大于20mA时,应缩短电缆的长度。
7.现场总线控制系统的控制器和输入输出子系统应安装在安全区,通常在控制室,但应尽量靠近安装在危险区的设备。
8.可采用中继器扩展通信范围,但在中继器的两端必须连接终端器,图中未画出。
9.为防止分支短路影响其他设备的工作,可设置短路保护器或多路隔离器。此外,在设计供电设备时应对每个设备附加约60mA短路电流,同时应考虑短路造成的电压降低。例如,采用A型电缆,传输距离500m时,一个设备因短路造成电压的降低是:60mAx44Ω/kmx0.5km=1.32v PROFIBUS-DP是应用最广的现场总线,网络控制系统的故障诊断比集中式控制系统难得多。S7-300/400提供了多种多样的故障诊断和故障显示的方法,供用户检查和定位网络控制系统的故障。我在6月13的日志中介绍了用STEP 7诊断网络故障的方法。今后将陆续介绍其他网络故障诊断和显示的方法。
CPU、DP从站和信号模块上的LED(发光二极管)提供了定位故障的基本信息。这种诊断方法简单、方便、直观,但是某些LED给出的故障信号可能很笼统,需要进一步使用其他诊断方法,例如用STEP 7的快速视图、诊断视图和模块信息进行诊断,才能获得具体、准确的诊断信息。如果控制系统的分布范围很宽,查看所有设备的LED也很费时费事。
下面重点介绍与S7-300的故障诊断有关的LED:
1)SF(系统错误/故障,红色):在CPU有硬件故障或软件错误时亮。可能的故障包括硬件故障、固件故障、存储卡故障、外部I/O故障、上电时电池有故障或没有后备电池、编程错误、参数设置错误、计算错误和时间错误等。
2)BF(总线错误,红色)LED常亮:总线故障(硬件故障),DP接口故障,多DP主站模式下不同的传输速率,DP接口(设置为从站/主站)被激活时总线短路。应检查总线电缆有无短路或断路,查看诊断信息,改正原有的组态。
3)BF LED闪烁,CPU作DP主站。可能的原因:连接的站有故障、无法访问至少一个已组态的从站、错误的项目组态。应检查总线电缆是否已连接到CPU,总线是否断开。CPU启动时如果LED不停止闪烁,应检查DP从站,或查看DP从站的诊断数据。
4)BF LED闪烁,CPU是活动的DP从站。可能的原因:超过了响应监视时间、DP通信中断、错误的PROFIBUS地址和错误的项目组态。应检查CPU、确认总线连接器是否安装正确、检查连接DP主站的总线电缆是否断路,检查组态数据和参数。
5)BF2/BF3 LED常亮:PROFINET接口故障。不能通信,例如,作为IO控制器的CPU与交换机或子网的连接断开、传输速率错误、未设置全双工模式。
6)BF2/BF3 LED闪烁:PROFINET接口连接的I/O设备有故障,至少一个已分配的I/O设备无法寻址,项目组态错误。
S7-400 CPU的系统故障分为INTF(内部故障)和EXTF(外部故障)LED。每个DP接口有一个总线故障LED。
可以在《CPU 31xC 和CPU 31x安装操作手册》和《S7-400 CPU规格设备手册》中查阅用LED诊断故障的详细信息,包括单个LED常亮或闪烁、多个LED状态的组合对应的故障信息。
DP从站模块也有用于指示DP从站的运行状态和故障的LED。详细的信息请查阅各种DP从站的用户手册。
CAN总线
CAN总线的测试和使用过程中,为了保证信号反射不至导致通讯失败,传输线上必须添加匹配终端。有多种方法配置CAN硬件,主要取决于你硬件的物理层:高速,低速,单线还是软件可配的。
(1)高速CAN
对于高速CAN,一对信号线的每根线(CAN_H和CAN_L)都必须添加120欧姆的匹配电阻,这是因为CAN总线两个方向都有数据流。具体做法就是在每一个CAN终端(多个设备时只需在最终端的设备)的CAN_H和CAN_L上跨接一个120欧姆电阻(实际操作时我试过120欧姆左右的都可用)。
(2)低速CAN
对于低速CAN,网络上每个设备的每条数据线都需要一个终端电阻:R(RTH)接在CAN_H上,R(RTL)接在CAN_L上,每个电阻的阻值需要参考低速CAN的使用手册进行计算。
(3)单线CAN
一般单线CAN(如NI)硬件内置一个9.9K欧姆的负载电阻,这就是网络要求的负载阻值,不需额外的电阻。
(4)软件可配
软件可配置CAN硬件可以通过软件来配置设备是工作在高速下,低速下或是单线接口。所需的终端电阻取决于被配置在哪个物理层。
2、LIN总线
LIN总线传输速率小于20Kbit/s,为低速总线,信号反射一般不太明显,不至于对通信造成太大影响。所以一般不需配置终端电阻。
在现代工业中,PLC 之间或PLC 与计算机之间的通信联网应用日益广泛。PLC 的联网功能越来越强。以欧姆龙CP1、CJ1 和CS1 系列PLC 为例,配合使用各种模块,可以支持工业以太网、Controller link 等现场总线通信联网功能。但是,应用广泛的CPM1A、CPM2A等中小型PLC 的通信联网一般只能采用工业总线的物理层形式(如RS232 或RS485),通信的稳定性与抗干扰能力并不是很强。
本文选用欧姆龙的CPM2A 机型,配合使用RS232-CAN 适配器,实现了计算机与PLC 的通信联网,方法简单, 实用性强。
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Siemens 200amp tap box X2004MIG 480/277 busway feeder bus duct center or end
Siemens 200A Main Lug Circuit Breaker Panel G4242ML3200CU (1)100A 3P (12)30A 3P
Siemens 200A Main Circuit Breaker Panel G4242MB3200CU (4)20A 3P (1)100A 3P
Siemens 200A Main Circuit Breaker Panel G4242MB3200CU (1)100A 3P (4)30A 3P
Siemens 200A Main Circuit Breaker Panel G4242MB3200CU (1)100A 3P (3)30A 3P
Siemens 200A 300Pole 240VAC Fusible Nema 3R Safety Switch GF324NR
Siemens 200 Amp Safety Switch HF364N 600 VAC Fusible Nema 1 in box NIB
Siemens 200 Amp Safety Switch HF364 600 VAC Fusible Nema 1 in box NIB
Siemens 200 Amp main Breaker Panel 42 circuits CDP-7 208 vac / 120 vac
Siemens 200 Amp Main Breaker Panel 3R W3040B1200CU 208Y/120 VAC 30 CIR 1PH
Siemens 200 Amp Disconnect GNF324 240 V Type 1 Enclosure
Siemens 200 Amp Breaker Panel 42 circuits MB G4242B3200CU 208Y/120 3PH 4W
Siemens 200 Amp 600 Vac 3 Pole FJ3B200 FJ3-B200 with shunt trip
Siemens 200 Amp 600 Vac 3 Pole FJ3B200 FJ3-B200
Siemens 200 Amp 600 Vac 2 Pole FXD62B200 Sentron Series Take Out NTO
Siemens 200 Amp 600 Vac 2 Pole FXD62B200 Sentron Series
Siemens 200 6ES7 216-2BD21-0B0 CPU 226 TOP Zustand
Siemens 2.5PL20 Ultrasound Probe
SIEMENS 2.5PL20 P/N 5262493-L0850 SECTOR CARDIAC ULTRASOUND PROBE for Elegra
SIEMENS 2.30A 0-400HZ MICROMASTER MOTOR DRIVE 6SE9212-TCA40
Siemens 1X980011 NSNP **GENUINE** Furnas
SIEMENS 1P6GT2600-4AK00 1P6GT26004AK00
SIEMENS 1P6FC5247-0AA11-1AA3 1P6FC52470AA111A
Siemens 1P 6XV1440-2AN10
SIEMENS 1P 6SN1118-0AD11-0AA1 VERSION B
Siemens 1P 6SE6410-2BB12-5AA0 MicroMaster 410 230 V
Siemens 1P 6GK7343-1EX00-0E0 Ethernet Communication Processor Module 24 VDC
SIEMENS 1P 6GK7 343-2AH-0A0
SIEMENS 1P 6GK7 343-2AH01-0A0
SIEMENS 1P 6GK7 343-1EX21-0E0
SIEMENS 1P 6GK5108- 0BA00-2AA3
SIEMENS 1p 6ES7-231-0HC22-0A0
SIEMENS 1p 6ES7-214-1BD23-0B0
SIEMENS 1NET8120666-01 1NET812066601
SIEMENS 1MJ60734CB12-Z 3 PHASE MOTOR, 50 HZ, 230/400 V, 0.37 KW
SIEMENS 1LE2-101-1CB314AA3 1LE2101-1CB314AA3 5HP 208-230/460 1735 RPM 184T MOTOR
SIEMENS 1LE10021BB222FA0 460V 4.6KW (6.16 HP) 3PH ELECTRIC MOTOR
SIEMENS 1LA91334KA91 MOTOR 3 PHASE 480V 60HZ 7.5KW 12.3A 1760RPM
Siemens 1LA91132KA11 5 HP 3525 RPM 3 PH 230/400 V TEFC Electric Motor
SIEMENS 1LA9107-4KA11 * OUT OF BOX*
Siemens 1LA9096-4KA61-Z Motor
SIEMENS 1LA909628A41-Z 1LA9096 IEC Motor #100002-21
Siemens 1LA9090-2KA91-Z Motor
SIEMENS 1LA7166-4BA99-Z SK4282AZ/VL-160 LA4 12.68:1 20HP 460V GEAR MOTOR D265768
Siemens 1LA7131-2AA61 3~ Motor
SIEMENS 1LA7113-4AA11-Z 1LA7-113-4AA11-Z 4,6KW 6,16HP 460V 1740 RPM 3PH MOTOR
Siemens 1LA7107-4AA60-Z 3KW 4.6HP Electric Motor Lenze Brake 400-690V 100L frame
Siemens 1LA71074AA60-Z 3.45KW 4.6HP 1720RPM 3PH Electric Motor w/Brake 400-720V
Siemens 1LA7090-4AA13-Z Motor
Siemens 1LA7090-0BA60-Z Motor
SIEMENS 1LA7080-4AA11 MOTOR * IN BOX*
SIEMENS 1LA70802AA91 120/208 DELTA/Y MOTOR ConDITION NO BOX
Siemens 1LA7080-2AA12 Electric Motor Low Voltage Squirrel-Cage IP55 2P -
SIEMENS 1LA7073-4AB12 0.43KW 220-240/380-420/440-480V-AC 1670RPM MOTOR D507764
Siemens 1LA7070-4AA11 AC Motor 0 25KW 60Hz 460V 1650RPM ! RFB !
SIEMENS 1LA7063-6AB11 MOTOR * OUT OF A BOX*
SIEMENS 1LA7063-6AB11 * IN BOX*
Siemens 1LA6133-6A61A
Siemens 1LA5083-4A22-Z 2-Wellen Drehstrommotor
SIEMENS 1LA5053-4AB-10 1LA50534AB10
Siemens 1LA5053-4AB10 Motor: 90Watt/1295- Rpm/230v -
Siemens 1LA5053-4AB10 Motor: 90Watt/1295- Rpm/230v
SIEMENS 1LA3215-6YK60 5 HP, 3 PH, 230/460V, 1155 RPM, TEFC, 215T frame
SIEMENS 1LA3182-4YK60 3 HP, 3 PH, 230/460V, TEFC, 182T frame
Siemens 1LA3 182-4YK60 3HP Motor, 1725RPM, 230/460V, Type RGZ, 182T
SIEMENS 1LA2106-2AA12 1LA21062AA12
SIEMENS 1LA0215-6FP21 5 HP, 3 PH, 230/460V, TEFC, 160 RPM, 215T frame
Siemens 1LA01464FP27 3 Phase Electric Motor 2 HP 1800 RPM B01-TESP103-0021
SIEMENS 1KVA/5KVA SIDAC-T INDUSTRIAL ConTROL TRANSFORMER 4AM5742-8DD40-0FA0
SIEMENS 1-HU3058-OAC01-Z SERVO MOTOR 2000 RPM,171V
SIEMENS 1HU3056-0AC01-0ZZ9-Z // 1 HU3056-0AC01-0ZZ9-Z
Siemens 1HU3056-0AC01 Permanent-Magnet-Motor
SIEMENS 1GH5100-0EG49-4TV1-Z 1.77KW 280V 3630RPM DC MOTOR HUBNER ENCODER D211196
Siemens 1FT6105-1AC71-?1EH1 Brushless Servomotor 46Nm 2000/min
SIEMENS 1FT5066-0AF01-9-Z Servomotor 1FT50660AF019Z
Siemens 1FT5064-0AF01-9-Z
Siemens 1FT5064--0AC74-2-Z AC Servomotor Permanent- Magnet- Motor
Siemens 1FT5046-0AF01-1ZZ9-Z
SIEMENS 1FT3035-6AZ-99-9-Z S30 3 BRUSHLESS SERVO MOTOR X-AXIS S23
Siemens 1FT 5062-0AK01-0 PERMANENT MAGNET MOTOR
SIEMENS 1FL3042-0AC31-0BK0 1FL30420AC310BK0
Siemens 1FK7042-5AF21-1UA0 Sinamics Brushless Servo Motor G-B
SIEMENS 1FK7032-5AK71-1SH3-Z 0,50KW 1,3A 156V SERVO MOTOR
Siemens 1FK7032-5AK71-1HG2 Servomotor Permanent Magnetmotor Nmax 10000 nN 6000
SIEMENS 1FK7032-5AK71-1GH0 Servomotor Motor mit Encoder AM512S/R M38 #GR-293-1
Siemens 1FK7032-5AF21-1LA0 Brushless AC Servo Motor 3000 RPM / GB w/ Cables
Siemens 1FK7022-5AK71-1HH2
SIEMENS 1FK7022-5AK21-1LG0 Servo Motor
Siemens 1FK7022-5AK21-1LG0 Compact Brushless AC Servo Motor 6000RPM
SIEMENS 1FK7022-5AF01-1SB0-Z
SIEMENS 1D1N002ST TRANSFORMER ~
SIEMENS 1D1N001C, TRANSFORMER 1 PHASE 1KVA 60HZ,
SIEMENS 1D1N001C, TRANSFORMER 1 PHASE 1KVA 60HZ,
SIEMENS 1D1N001C 1D1N001C
SIEMENS 1BB1224Q BUCK-BOOST TRANSFORMER TYPE: QB, 1.00 KVA, 60HZ, 1PH
Siemens 18DSE92BF Nema Type 1 Combo Starter Very Nice
SIEMENS 18-658-701-570 18658701570
SIEMENS 18-387-921-503 18387921503
SIEMENS 17FSH92NF, NON-FUSIBLE COMBINATION STARTER SIZE 2
Siemens 17DUC92BF10 Fusible Combination FVNR Heavy Duty Motor Starter -
SIEMENS 17DSF92BF12 NEMA SIZE 1 COMBO MOTOR STARTER
SIEMENS 17DSF92BF Size 1 110 120 V Non Fusible Combo Starter NEMA 1 14DS+32A
Siemens 17DSE92BF11 Combination Starter 600V 30A Nema size 1
Siemens 17DSD92BF Sz 1 Combo Starter 14DSB32A 48ASD3M20 N1
Siemens 17CUD92NF10 Combination Starter 120V 22A 3PH
Siemens 17CP92NF-1181 SERIES D COMBO Motor starter, SFIS-1413E-0405 ,
SIEMENS 17CP92BJ81 FUSIBLE COMBINATION MAGNETIC STARTER, NIB
SIEMENS 17CP92BF1181 NEMA SIZE 0 COMBO MOTOR STARTER *S3
SIEMENS 1790L811A INVERTER I/O BOARD * *
Siemens 1710110-Y1-N1/3 Modul Top.
Siemens 17,3 kW (23 HP) AC Motor, 1LA7164-2AA61, 460V, 3525 RPM,
Siemens 1654776 X2134 BG 1971-6033-160 Schaltbild
SIEMENS 1654174201c ENCODER PICK UP SENSOR 1654174201
SIEMENS 16 31 691 X1989 D12 E3 Siemens Medical Solution Module
Siemens 15hp motor, type-RGZ1, fr-254T, 230/460v, 3ph, 1740rpm, free shipping