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SCXI-1000SCXI-1000

PLC對數字量信號的識別是通過其數字量輸入模塊完成的。PLC控制軋鋼生產設備時，設備中的壓力、溫度、液位、行程數字及操作按鈕等數字量傳感器與PLC的輸入端子相連，每個輸入端子在PLC的數據區中分配有一個“位"，每個“位"在內存中為一個地址。讀取PLC輸入位的狀態值可作為識別數字量故障信號的根據。診斷數字量故障的過程，實質就是將PLC正常的輸入位狀態值與相應的輸入位的實際狀態值相比較的過程。如果二者比較的結果是*的，則表明設備處于正常工況，不*則表明對應輸入位的設備部位處于故障工況。這就是PLC診斷基于數字量信號故障的基本原理。這種診斷方法，故障定位準確，可進行實時在線診斷。通過PLC的圖形功能塊編程，還可將故障診斷融入過程控制，達到保護軋鋼設備的目的。

鄭娟萍

廈門仲鑫航自動化設備有限公司 

 PLC對模擬量信號的識別是通過PLC的模擬量輸入輸出模塊來完成的。模擬量輸入輸出模塊采用A/D轉換原理，輸入端接收來自傳感器或變送器的模擬信號，輸出端輸出的模擬信號作用于PLC的控制對象。PLC診斷模擬量故障的過程，實質就是將在相應A/D通道讀到的監測信號的模擬量的實際值與系統允許的極限值相比較的過程。如果比較的結果是實際值遠離極限值，則表明軋鋼生產設備對應的受監控部位處于正常狀態，如果實際值接近或達到極限值，則為不正常狀態。判斷故障發生與否的極限值根據實際系統相應的參數變化范圍確定，利用PLC上的模擬量設定開關可精確設置該極限值。

HSR15A2UU+340mm Used THK Linear Bearing 2Rail 4Block LM Guide NSK CNC Route

LRX20+750mm Used IKO Roller LM Guide Linear Bearing 2Rail 4Block CNC Route Hole

LM Guide IKO Used LWL7B+134mm 2Rail 4Block THK RSR7 NSK LU07 Miniature Bearing 

THK LM Guide Actuator Used KR3320A 370mm stroke Order made type Linear NSK NB

SEBS9+95mm Used NB Linear Bearing Miniature LM Guide RSR9 LU09 LWL9 2Rail 4Block

Compact Ground Ball Screw NSK BSS2010-3E+1008mm Order made Support unit Raydent 

GTR1505C5+503mm Ground Ball Screw Used ISSOKU EK12+EF12 Linear Bearing THK NSK

Ground Ball Screw ISSOKU Used GTR1205C5+220L Used Support Unit EK10+EF10 THK,NSK

LM Guide SR15W2UU+580mm Used THK Linear Bearing CNC Route 2Rail 4Block NSK IKO

BTK1605+800mm Used THK Rolled Ball Screw Linear Motion Bearing FK12FF12 3D Print

LM Guide SR15W2UU+460mm Used THK Linear Bearing CNC Route 2Rail 4Block NSK IKO

LH20AN+380mm NSK LM Guide Used Linear Bearing THK HSR20R 2Rail 4block CNC X Axis

NR35LA2UU+600L THK Used LM Guide Linear Motion Bearing CNC Axis 1Rail 2Block

Actuator Unit Parts Used / BNK1520 Ball Screw/ 200mm Stroke / LM Guide / Linear 

SS15AL+515mm NSK LM Guide Bearing 2Rail 2Block THK SR15W CNC Route Actuator

MES20+930mm Used IKO Linear Bearing LM Guide THK SR20W 2Rail 4Block lightweight

BENDIX 21150 Used LM Roller THK LRU Type Linear Roller bearing

Linear Actuator Parts Ground Ball Screw Used NSK W1504 LM Guide SGL15F+280mm NB

Wide Miniature LM Guide Used IKO LWLFG30B+94mm 2Rail 2Block limited Linear motio

TSUBAKI HBW20TA2UU+335mm H20TA Old Stock Surplus LM Guide Linear Bearing BRG-I-7

SGL15F+280mm Used Linear Bearing NB SR15V THK NSK 2Rail 4Block CNC Route

CM2KL32-75S Non rotating Used Pneumatic cylinder with bracket single acting SMC

LM Guide HSR20R+340mm THK Used Linear Bearing NSK LH20AN 2Rail 4Block CNC Route

LE12AR+590mm NSK LM GUIDE New RSR12W THK Linear Bearing CNC Route 1Rail 2Block

LE120630ARK1B02 630mm NSK Used LM Guide RSR12W THK Linear Bearing light smooth

HSR15A2UU+394L Used THK Linear Bearing 2Rail4Block NSK LM Guide CNCRoute Raydent

TM Screw Used Unit ATM12+218mm Right+Left Helix 7900P4 Support Linear Motion

GE1520+872mm Used KURODA Ground Ball Screw Linear Motion Bearing CNC Route

LWES15+962mm Used IKO Linear Bearing LM Guide THK SR15W 2Rail 4Block 3D Printer

Miniature Precision Ground ball screw GTR0602+119mm Japan ISSOKU CNC Route Lathe

Made ATM08+145mm Used Right/Left Helix TM Screw with support coupling unit

BWU1730 Used IKO Precision Linear Ball Slide Unit Miniature LM Compact Bearing

NSK Rolled Ball Screw 1212+640mm fast miniature linear motion bearing Used W1206

Rolled Ball Screw THK BNT2005+1385mm Used Square Type FK15 Vertical Linear Beari

Actuator Used Parts 105mm SG1015 Ground Ball Screw/SSR15V+180L LM Bearing CNC

Linear Actuator Parts Rolled Ball Screw Used THK BLK1510+388mm LM Guide Bearing 

Linear Bearing Used IKO LWLFG42B+320mm THK, NSK LM Guide 1Rail 2Block CNC Route

NSK Ground Ball Screw W2003-1175PK1-C5Z 5mm lead 460mm K1 Seal BK15+BF15 Linear 

Ground Ball Screw SFD1604+461mm 4mm lead Linear Bearing LM Motion THK,NSK

Precision Miniature Ground Ball Screw Used GTR1205C5+353L ISSOKU EK10+EF10 THK,N

Ball Spline Used LT16+75mm Bracket THK Linear Bearing IKO,NB Lot of 2 / vertical

Bosch Rexroth Ball Screw 2005+1090mm Used R151211013 Nut Bracket Support CNC Rou

LM Guide Used IKO LWLC5+22mm Lot of 4 RSR5 THK Miniature Linear Bearing

HSR15R+520mm THK Used Linear Bearing NSK LM Guide 1Rail 2Block Raydent CNC Route

THK Ground Ball Screw Used 1605+895mm Order Made Type Linear Bearing CNC Route

SSR15XW2UU+500L THK LM Guide 2Rail 4block New Surplus

SR15W2UU+520mm Used Linear Bearing THK Raydent LM Bearing CNC Route 2Rail 4Block

Linear Bearing MSA20E+880L New PMI AMT LM Guide THK HSR20A 2Rail 4Block CNC Rout

Used Linear Bearing LM Guide AMT MSB15S+260mm THK SR15W 2Rail 4Block 3D Printer

SSELB16+150mm Used MISUMI Linear Bearing THK RSR15N NSK LM Guide 2Rail 2Block

MLF42+434mm IKO Used LM Guide THK, NSK Linear Bearing 2Rail 4Block RSR15W C Lube

HR20MN+830 Used LM Guide CPC 2Rail 4Block THK HSR20R LH20AN CNC Route lathe mill

THK Rolled Ball Screw Used BLK2020+1087mm BK15+BF15 Nut Bracket Linear Motion

LM Guide SSR25XV+280mm THK Used Linear Bearing SR25V 2Rail 4Block CNC Route

VFA1520C7+798mm NSK Used Ground Ball Screw Linear Bearing high lead CNC Route

EGH20SA+580mm New HIWIN 2Rail 8blocks THK SR20V CNC Route Anti Rust Raydented 

SSR25W2UU+520L Linear Bearing Used THK NSK LM Guide linear motion CNC Route

HR1123+230mm Separate type Linear bearing Used THK LM Guide 2Rail 4Block adjusta

BLK1510+550mm THK Rolled Ball screw BK10+BF10 Used Linear Actuator bearing

Ground Ball Screw Power Steering Handle 195mm Rack Gear for multi purpose 

CDJ2B16-100-CJL Used Pneumatic Air cylinder Lot of 2  SMC  100mm stroke

THK LM Guide Used SR20V2+940mm Linear Bearing 2Rail 4Blocks Cheap and free ship

LH20EL+1120mm NSK LM Guide Used Linear Bearing CNC Route THK HSR20A 2Rail 4Block

Linear Actuator unit Parts used SR15W+488mm BTK1405+420mm LM Guide Bearing Lathe

BRS15B+630mm Used ABBA Linear Bearing LM Guide THK SR15W 2Rail 2Block NSK LS15AL

CDM2E32-130A-C73L Used SMC Cylinder Pneumatic air linear motion 130mm stroke

Ball Spline Machined Shaft LMT13UU+134mm THK 2Shaft 2Nut LT13UU Low Torque type

Used KSS Ground Ball Screw Square type 1410+337mm THK BNT LM Bearing CNC Route

BLK3636-3.6+2224mm THK Rolled Ball Screw 36mm lead New Linear Actuator Bearing

THK LM Roller Unit Used LR1547 infinite circulation miniature Linear Bearing

SFR2525+860mm Rolled Ball Screw TBI Used Linear Actuator Bearing THK BLK2525

4RSR15VM+780mm THK Used Linear Bearing LM Guide Miniature System 2Rail 8Block

Precision Miniature 1002 Ball Screw 250L SG1002 KSS Japan Linear Bearing

Used THK LSP1365 Ball Slide Linear Bearing Miniature LM Light Rack Pinion type

-VR6-250X17Z THK Used Cross Roller Guide VR6250T IKO Precision Linear Motion CNC

LS15CL+480mm Used NSK Linear Guide Bearing LM THK SR15V CNC Lathe Mill Router

Miniature Ball Screw Used BNK1002+143mm THK Support Unit EK08+EF08 Bracket NSK

WTF2040+980mm Used THK Rolled Ball Screw Super-Lead No preload Linear Motion CNC

LM Guide LS20AL+692mm Used Linear Bearing NSK THK SR20W 2Rail 4Block CNC Route

Linear Bearing Actuator Parts Used Ball Screw GE1520+770mm SR15W+690mm LM Guide

BNT2005+1385mm Used THK Rolled Ball Screw Square Type EK15+EF15 Linear Bearing

Liner Bearing LS15FL+535mm Used LM Guide NSK THK SR15TB 2Rail 4Block CNC Route

NSK Linear Bearing LS15ALK1+760mm 2Rail 4Block SR15W THK LM Guide CNC Route

Used SR0805+134mm KSS Miniature Rolled Ball Screw 8diameter 5Lead Japan LM Beari

Linear Actuator bearing NSK LS25AL+1250L Used LM Guide THK SR25W Raydent CNC Rou

HIWIN Used rolled ball screw cylindrical tap mount 1510+553mm 10mm lead

BLK2020+1135mm Rolled Ball Screw Used THK BK15+BF15+Nut Bracket for Industrial 

LU12+560mm NSK Used Linear Bearing LM Guide Miniature System THK RSR12 IKO LWL12

R16662+280mm Rexroth Bosch STAR Used LM Guide Linear Bearing Slim Short Block

BNK2520-3.6+860mm THK Used Ground Ball Screw Linear Bearing NSK CNC Route

BNK2520-3.6+860mm THK Used Ground Ball Screw Linear Bearing NSK CNC Route

LM Guide Used MGW15C+845 Hiwin Linear Bearing Wide Low height 1Rail2Block RSR15W

SHW27CR+1060mm Used LM Guide 1Rail 2Block Low compact type THK Linear Bearing

HSR15A2UU+800mm R1651 1 Bosch Linear Guide Bearing Used 2Rail 4Block THK NSK CNC

Cross Roller Slide Unit DEL-Tron Used RE-3 Miniature THK VRT linear motion Inch 

Ground Ball Screw W1504P Used NSK 263mm Length CNC Route Z-Axis THK 3D Printer

Ball Spline Machined LMT13UU+170mm THK 2Shaft 4Nut LT16UU Low Torque type CNC

HSR30LR+245mm HSR30H THK Used LM Guide CNC Route NSK Linear Bearing 1Rail 1Block

Rolled ball screw 1605+511mm new other Linear motion Bearing TBI LM Automation

1671-8+520mm LM Guide Low Height Wide Type Used STAR Bosch Rexroth THK HRW27CA

Ground Ball Screw USED NSK W3207-822PSS+955mm 32diameter Lead5mm THK CNC Route

Mini Actuator 5mm lead Unit precision ground ball screw and LM Guide linear unit

RSR12ZM+493mm Used Linear Bearing Miniature THK LM Guide 2Rail 4Block NSK,IKO

SR25W2UU+1670mm THK Used Linear Guide Bearing LM Actuator 2Rail 4Block CNC Route

Ground Ball Screw NSK Used W1507FA-1P-C5Z 1510+870mm AK12+AF12 Nut bracket BNK15

LM Guide Actuator Used MLC20+138mm 2Rail 4Block Compact Miniature IKO MISUMI NB

RSR15+70mm THK Used Linear Bearing LM Guide Miniature System NSK 2Rail 2Block

Ground Ball Screw Used GE1204C7+505mm  KURODA Miniature CNC Route THK,NSK

RSR9KMUU+174L THK Used LM Guide Miniature Linear Bearing 2Rail 2Block with plate

Linear Motion BNT2005+1090mm Used THK Rolled Ball Screw Square Type EK15+EF15

HSR15R+640mm THK Used Linear Actuator Bearing LM Guide 2Rail 4Block CNC 3D Print

RSR12+145mm TSK Used LM Bearing 2Rail4block LMBM12 THK NSK LU12 Linear Guide CNC

NSK SS25AL+340L Used LM Guide THK SSR25XW Linear Bearing CNC Route 2Rail 4Block

RSR9KM2UU+350mm THK Used LM Guide / Miniature Linear Bearing / NSK CNC Route

RSR12WVM+87mm Used Linear Guide Bearing THK 2Rail 2Block IKO NSK Wide Miniature

SRS15WM+350mm 1Rail 2Block THK Used Linear bearing RSR15W No Preload lightweight

LM Guide LH12AN+425mm NSK Miniature Linear Bearing THK HSR12RM 2Rail 2Block CNC

Wide and Low height LM Guide HRW17CA+550mm 1Rail 2Block Used THK Linear Bearing 

Ground Ball Screw Used W2812-82P-C1Z Dia 28mm Lead 10mm 1510L NSK CNC Route

FBR16x2+196mm Used Carry Ball Screws NUT Eichenberger Gewinde BK12+BF12 THK NSK