PLC自檢信號很多，內(nèi)部器件也很多，多數(shù)使用者未充分發(fā)揮其作用。5X00070G04
其實，完全可利用它進行PLC自身工作的監(jiān)控，或?qū)刂茖ο筮M行監(jiān)控。
這里介紹一種用PLC定時器作看門狗，對控制對象工作情況進行監(jiān)控的思路。
如用PLC控制某運動部件動作，看施加控制后動作進行了沒有，可用看門狗辦法實現(xiàn)監(jiān)控。具體作法是在施加控制的同時，令看門狗定時器計時。如在規(guī)定的時間內(nèi)動作完成，即定時器未超過警戒值的情況下，已收到動作完成信號，則說明控制對象工作正常，無需報警。
若超時，說明不正常，可作相應(yīng)處理。5X00070G04
如果控制對象的各重要控制環(huán)節(jié)，都用這樣一些看門狗"看"著，那系統(tǒng)的工作將了如指掌，出現(xiàn)了問題，卡在什么環(huán)節(jié)上也很好查找。
還有其它一些監(jiān)控工作可做。對一個復(fù)雜的控制系統(tǒng)，特別是自動控制系統(tǒng)，監(jiān)控以至進一步能自診斷是非常必要的。它可減少系統(tǒng)的故障，出了故障也好查找，可提高累計平均無故障運行時間，降低故障修復(fù)時間，提高系統(tǒng)的可靠性。
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SMC PNEUMATIC AIR REGULATOR 0.05-0.85MPA 5/8'' PORT  AW3000-03

NASON PRESSURE SWITCH SP-19A-25F/ES

SUBURBAN TOOL, INC MACHINED UNIVERSAL RIGHT ANGLE URA060608

SCHROEDER 10 MICRON FILTER ELEMENT, K10, NNB

SIX-PAK POWERTHERM 6 DIO BRIDGE EFC15F

GRAINGER 3/16" WIRE ROPE CLIP NIB LOT OF 5 4DV345

JOHNSON CONTROLS MICRO-SET DUAL PRESSURE CONTROL 400 PSIG MAX. P170SA-5

ALLEN BRADLEY  * CONTACTOR COIL SER.C * 100-A45N*3

RIGID BOLT UNIVERSAL--HS PRE-TESTED WORK SAVER TOOL NIB

GE * T563 CARBON BRUSH NIB * 36A164456AAP21

AMPHENOL POWER ASSEMBLY CABLES 5 PIN 97-3057-10-6 W/ 6 PLUG ACT9327

ALLEN BRADLEY SLC SERVO CONTROL MODULE USERS MANUAL 40072-030-01 (D)

FISHER CONTROLS 250 PSIG 1/4 INCH NPT REGULATOR PILOT, TYPE 6392

FAFNIR 1-7/16" SHAFT DIA. BALL BEARING INSERT, ER-23 *NEW*

FESTO 25MM PISTON 15MM STROKE PNEUMATIC CYLINDER, ADN-25-15-A-P-A *NEW*

PHOENIX CONTACT CABLE CONNECTOR SACC-M8FS-3CON-M-SW *NEW*

FESTO PNEUMATIC PRESSURE VALVE LR-M2-G1/4-07GI

ASCO 600V 105C 1200AMP COIL KIT 343530-065 *NEW*

HONEYWELL 10A 125/250VAC MICRO SWITCH LIMIT SWITCH 1LN1-1-RH

FESTO 40MM BORE 30MM STROKE PNEUMATIC CYLINDER, DNG-40-30-PPV-A, NNB

BROWNING 1-5/8IN. BORE COUPLING CHJP3X5/8 *NEW IN BOX*

ALLEN BRADLEY 120VAC COIL SIZE 0 STARTER 509-AOD SER. B

CARR LANE SCREW REST BUTTON M1215SRB SEALED

FESTO SILENCER U- 1/4 63-35-4923 NIB

SLOTTED SHIM B-.002/.051MM LOT OF 4

ABB CABLE 3HAB 7434-1 REV. NR 04

NORTON 6" GRINDING WHEEL  D027440 8/96

NUMATICS PRESSURE SWITCH  PS180CAN02 0B8

IFM EFECTOR PROXIMITY SENSOR IGA2008-ABOA/SL/IGO341 NIB

NORGREN * CONNECTOR NIB * 4355-51

IPEX * PVC 4X3 COUPLER LOT OF 2  * -

GRIER  BENCH GRINDING WHEEL GC 60 , NNB

VICKERS HYDRAULIC VALVE G4V-3-2A-M-U-HL7-60

SYLVANIA SERVICE KIT CY 32-1 TYPE CY STARTER SIZE 2 NIB

EGS 4" SQUARE BOX CONDUIT 25 IN BOX 4SD-1 NIB

ASCO  SOLENOID COIL MP-C-086

ENDINE * SHOCK ABSORBER * OEM1MB

SIEMENS OUTPUT INTERFACE MODULE 24VAC 3TX7 004-1LB00

BANNER * LIGHT CURTAIN 51.5'' * SLSE14-1200

BUSSMANN OPTIMA FUSE BLOCK  30A 600V IR200kA OPM-1038RSW

AEG 110/115V COIL 55A 600VAC CONTACTOR LS37 910-301-622-86

LEE SPRING * M1125035.00 180VDC 0.36A 1/17HP GEAR MOTOR * 985-631-E

PARKER * LIQUID LINE DRYER * 712

BALLUFF LIMIT SWITCH BNS 819-D04-R16-100-10-FD

OMRON BASE RELAY 24VDC 37TC-OC16

WILKERSON COALESCING FILTER M18-C3-CG00

GROVE GEAR IRONMAN 0.395 INPUT HP 1750 RPM GEARBOX GR-TMQ813-30-L-56

APEX * 3/8" DRIVE 10" EXTENTION  *  EX-376-10-3/8

* 1/4" CROSS PIPE FITTING 1 LOT OF 3 * -

WINTERS * GUAGE 0-160 PSI 0-1100 KPA * 1953

LASCO * 1" SCH80 T PVC LOT OF 5 * -

UNKNOWN MFG * CLAMP 1 LOT OF 29  * 3/4"

SMC 1/2" NPT 1/2" TUBE O.D. ONE-TOUCH MALE FITTINGS, KQH13-37S *NEW LOT OF 10*

FESTO 4 PIN SOLENOID PLUG MSSD-C-24-SA NIB

CLEVELAND TWIST DRILL CO. 5/8 X 5/32 X 1/2 HS SIDE MILL #505

ALLIED TELESYN CENTRECOM 8 PORT ETHERNET SWITCH W/100 FX UPLINK  FS709FC

ALCO CONTROLS 1/8 B 3/64 B PRESSURE:950 SOLENOID VALVE 202CB NIB

TAIYO 70H-8 7MPa HYDRAULIC CYLINDER 1FA40BB35-BD

NATIONAL HIGH SPEED 33/64 APPROX 6-3/8" OAL TAPER SHANK DRILL BIT

HYDRO-LINE HR2DC 15X1.5 HYDRAULIC CYLINDER IC8602-705-1

PARKER 1-1/4" NPT 1-1/4" TUBE TRIPLE-LOK MALE FITTINGS, 20FTX-S *NEW LOT OF 2*

YASKAWA ELECTRIC 3000R/MIN 200W AC SERVO MOTOR SGMAH-02AAA2C-Y2

OMRON * LINE SENSOR  * F3W-C044-D

SKF EXPLORER 086F BALL BEARING 6201 ZJEM NIB

SIEMENS * SIMATIC S7 CABLE NIB * 6ES7901-1BF00-0XA0

STANLEY 21oz. 1.4" D COMPO-CAST SLIMLINE HAMMER 57-543

WATTS * 3/4" REPAIR KIT NIB * RK 009 M2 CK2

1-1/2" TO 1-5/8" COPPER ELBOW LOT OF 4

ABB ASEA 110/120VAC COIL AC CONTACTOR EFLG 40

100 FT 3/8 GENERAL CABLE

PHD SERIES 5580 SWITCH 53626 NEW

TIMKEN BALL BEARINGS 204KDDG Z5 FS50000, LOT OF 2

TOSHIBA G9 ASD QUICK START GUIDE  G9 MANUAL PACK 58401-004

SCHRADER BELLOWS ROD SEAL REPLACEMENT KIT 696718501 *NEW IN BOX*

MARTIN SPROCKET  50BS13 1 *NEW IN SEALED BOX*

PARKER ROD GLAND CARTRIDGE KIT RG2AN00171 NIB

PDB STRAIGHT SHANK 059612.0356 0281-1471  RDC-022020

FEDERAL MOGUL * STEEL DEEP CUP FREEZE PLUGS BAG OF 12  * 381-3080

NEW STARTER FRSA785 NIB

OPTIBELT ZR TIMING BELT 540 H NNB

ALLEN BRADLEY  * KEY 5MM * 450-21

MKS PIPE ADAPTER NW16-1/8"

HUBBELL 3/4" CONDUIT COUPLING BOX OF 28 2623

BLUE-BAK WATERPROOF PAPER T414, 9"X11" 360B 50 SHEETS

DYNACORP 90-VDC CLUTCH BREAK  304294-32

FIRESTONE AIR SPRING W01-358-7184

CARTER SFH-44-A 1 3/8 NEVERLUBE CAM FOLLOWER LOT OF 7

WATTS * 3/4"-1" SECOND CHECK REPAIR KIT NIB  * RK 909 CK2

FH311, HANDLE, BLUE NYLON, NIB

SKF OIL SEAL 30095

SKF OIL SEAL 13510

MARTIN 21 TOOTH 100A21H SPROCKET

TELEMECANIQUE *  RED BEACON STACK LIGHT W POLE * -

GATES HOSE FITTING NNB 1 LOT OF 2  G2510 0406 4G 6MPX

TIMKEN TAPERED ROLLER BEARINGS M802048 NIB

HONEYWELL SWITCH LEVER LSZ51A LOT OF 11

1-1/2" TO 1-5/8" COPPER ELBOW LOT OF 4

ABB ASEA 110/120VAC COIL AC CONTACTOR EFLG 40

100 FT 3/8 GENERAL CABLE

PHD SERIES 5580 SWITCH 53626 NEW

TIMKEN BALL BEARINGS 204KDDG Z5 FS50000, LOT OF 2

TOSHIBA G9 ASD QUICK START GUIDE  G9 MANUAL PACK 58401-004

SCHRADER BELLOWS ROD SEAL REPLACEMENT KIT 696718501 *NEW IN BOX*

MARTIN SPROCKET  50BS13 1 *NEW IN SEALED BOX*

PARKER ROD GLAND CARTRIDGE KIT RG2AN00171 NIB

PDB STRAIGHT SHANK 059612.0356 0281-1471  RDC-022020

FEDERAL MOGUL * STEEL DEEP CUP FREEZE PLUGS BAG OF 12  * 381-3080

NEW STARTER FRSA785 NIB

OPTIBELT ZR TIMING BELT 540 H NNB

ALLEN BRADLEY  * KEY 5MM * 450-21

MKS PIPE ADAPTER NW16-1/8"

HUBBELL 3/4" CONDUIT COUPLING BOX OF 28 2623

BLUE-BAK WATERPROOF PAPER T414, 9"X11" 360B 50 SHEETS

DYNACORP 90-VDC CLUTCH BREAK  304294-32

FIRESTONE AIR SPRING W01-358-7184

CARTER SFH-44-A 1 3/8 NEVERLUBE CAM FOLLOWER LOT OF 7

WATTS * 3/4"-1" SECOND CHECK REPAIR KIT NIB  * RK 909 CK2

FH311, HANDLE, BLUE NYLON, NIB

SKF OIL SEAL 30095

SKF OIL SEAL 13510

MARTIN 21 TOOTH 100A21H SPROCKET

TELEMECANIQUE *  RED BEACON STACK LIGHT W POLE * -

GATES HOSE FITTING NNB 1 LOT OF 2  G2510 0406 4G 6MPX

TIMKEN TAPERED ROLLER BEARINGS M802048 NIB

HONEYWELL SWITCH LEVER LSZ51A LOT OF 11

CHICAGO RAWHIDE OIL SEAL 35412 NIB *LOT OF 2*

MORSE CHAIN LINKS 127798 *NEW, SEALED LOT OF 3*

12 MTW BLACK 500' STRANDED BOAT CABLE E125352

TRUPAR AMERICA HOSE D028-1281 UN 37634 NNB

UNKNOWN MFG BRASS 90 DEGREE ELBOW BAG OF 9  1/4

TOTAL SOURCE, CL909737 BRUSH, LOT OF 4 ,NIB

JAMESBURY 116 PSI DOUBLE ACTING ACTUATOR VPL300DABO

PARKER  CYL KIT 2 " BORE GRP5 2MNR , NIB

STEUERLUFT SPRAY HEAD T270054 NIB

2" FEP ENCAPSULATIONG SILICONE GASKET NIB

TIMKEN ROLLER BEARING CUP 432 NIB

WIDELL TAP 3 3/8-16 HSS

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NTN BEARING SAR1-25SS

CIRCUIT BOARD MLO94V-00430

FAFNIR BALL BEARING 5203 KD NNB

ALLEN BRADLEY AUXILIARY SWITCH Z-2114

TURK CONNECTOR RSM2RKM57

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