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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。

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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。

SR15W2UU+366mm Used Rexroth Bosch LM Guide 2Rail4Block CNC Route Linear Bearing

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

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

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

MR12MN2UU+493mm CPC Used LM Guide/ Linear Bearing / THK RSR12 / LWL12 CNC Route

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

Curve LM Guide THK Used Order made HCR25A+30/300R  Round Linear Bearing Circular

SR15W+580mm Used Rexroth LM Guide Linear Bearing THK CNC Route 3D Printer 2R,4B

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

SR15W+1460mm Used LM Guide THK Linear Bearing 2Rail 4Block Motion preload motion

LMBM12+220mm TSK Used LM Bearing 2Rail 8block RSR12 THK NSK Linear motion Guide 

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

SR20WUU THK LM Guide Block Brand New Lot of 2 Linear Bearing Cartridge

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

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

THK LM Roller Unit Used LR1547 infinite circulation miniature Linear Bearing

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

LWLC12B+425mm IKO Mini LM Guide Linear Bearing 2Rail 4Block Raydent CNC Route

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

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

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

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

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

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

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

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

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

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

THK HRW50CA Surplus LM Guide Block Cartridge Linear Bearing BRG-I-4

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

THK Old LM Guide Bearing HRA Type 2Blocks HR1530 HRW27 for maintenance BRG-I-5

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

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

Curve LM R Guide Used HCR15A+60/150R Round Motion THK Circular System 1Rail1Bloc

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

HSR30A THK LM Guide Brand New Linear Bearing

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 

LS15CL+1480mm Used NSK Linear Guide Bearing LM THK SR15V 2Rail 8Block CNC Lathe 

LS20CL+416mm NSK Linear Bearing SR20V THK Used LM Guide 2Rail 4Block CNC Route

HSR15A2UU+520mm Used THK Linear Bearing 2Rail 4Block LM Guide NSK CNC Route

SR25W2UU+784mm THK Used Linear Guide Bearing LM NSK 2Rail 4Block CNC Route

LWHS20SL+890mm Used IKO Linear Bearing THK,NSK LM Guide Stainless steel type

RSR9WVM+68mm THK Used LM Guide Linear Bearing NSK IKO CNC Route 4Rail 4Block 

HSR20LR2UU+680mm THK Used LM Guide Linear Bearing 2Rail 4Block CNC Route

Round Linear Bearing Used HCR15A+60/400R R Guide LM THK Curve Motion Circular

THK LM Guide Used SR20V+460mm Linear Bearing 2Rails 4Blocks CNC Route NSK, IKO

NSK LU15+780mm Used LM Guide Linear bearing THK RSR15 2Rail 4Block No preload Ty

LS15CL+640L NSK User LM Guide Linear Actuator bearing THK SR15V 2Rail 4Block

LWLG12B+545mm Used IKO Linear Bearing Miniature LM Guide 2Rail 4Block RSR12N THK

LM Guide Used HGH20C+700mm HIWIN Linear Bearing Actuator THK HSR20R 2Rails 4Bloc

LWES25+736mm IKO Used Linear Bearing LM Guide THK SR25W 2Rail 4Block CNC Route 

CSR15 Used THK Orthogonal Linear Bearing HSR15 LM Guide X-Y Motion stage Axis

Linear Bearing LM Roller Unit Used IKO SR1540 infinite circulation

R1605 76-1510mm Bosch Rexroth 30mm Linear bearing rail for block and cartridge

PE12BR+300mm NSK Used LM Guide RSR12WN  LE12BL Raydent 2Rail 2Block CNC Route

SR15W2UU+298mm Used Linear Bearing THK LM Bearing CNC Route Lathe Mill NSK IKO

RSR12ZM+585mm Used LM Guide Miniature Linear System Bearing 2Rail 2Block 3D Prin

HSR35-1240L LM Guide Used THK Linear Bearing for maintenance  Rail continuation

LWLF18+310mm Used IKO Miniature LM Guide THK RSR9W 2Rail 4Block Linear Actuator

SSR15XW+640mm THK USED LM GUIDE Linear Bearing 2Rail 4Block DIY CNC Route NSK

LM Guide Used SS15AL+325mm NSK Linear Actuator Bearing THK SSR15XW CNC Route

Rexroth Bosch New LM Guide R1653 713 20 HSR30LA+680mm 2Rail 4Block CNC Route

THK LM Guide Used 2SRS12WM+350L Linear Bearing 2Rail 4Block wide profile CNC Rou

HSR20A2UUF+2320LTF New THK Linear Bearing to extend LM Guide 1Rail 2Block CNC

SHS20V2UU+830mm THK Linear Bearing Used LM Guide 2Rail 4Block NSK CNC Route

Linear Actuator Bearing GSR20T2UU+1060LF THK Self adjustment capability 2Rail 

Linear Guide Bearing RSR12WVM+470mm Used  THK 2Rail 4Block IKO NSK Wide Miniatur

LH25GL+540mm Used NSK Linear Bearing 2Rail 4Block THK HSR25LA LM Guide CNC Route

LWLG9B+820mm IKO Used Linear Bearing LM Guide Miniature System THK RSR9N NSK 2Ra

RSR9W+50mm New LM Guide THK Miniature Linear Bearing Raydent Lot of 10

Bosch Rexroth 15+2200mm R16221 Used Long LM Guide Bearing THK SR15W 2Rail 6Block

LWLC7B+240mm Used IKO LM Guide Linear Bearing 2Rail 8Block CNC Route THK

Linear Bearing Rail SR30-1240L LM Guide Used THK Linear Bearing for maintenance

LW21EL+1380mm Used LM Guide NSK HRW21CA THK wide Linear Bearing 1Rail 1Block

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

SSR20XW2UU+940L Linear Bearing Used THK NSK LM Guide Bearing CNC Route 2Rails 4B

R1653 313 20 Bosch Rexroth Star Used 35 size LM Guide Block Cartridge maintenanc

THK SR35 Linear Rail 1577mm LM Guide 1Rail for maintenance or continuation CNC

CSR20 Used THK Orthogonal Linear Bearing HSR20 LMGuide XY Motion Auto stage Axis

LWLF42+480mm Wide LM Guide Used IKO Linear bearing 2Rail 4Block THK RSR15W

SR20UU Used NB Stroke Bush / ST20UU THK / Lot of 2 / Linear Bearing / LM Bushing

LE15AR+550mm NSK Used Wide Low Profile Linear Bearing THK RSR15W 2Rail 4Block

HSR15AQZUU Lot of 2 Used THK Linear Bearing LM Guide Block cartridge maintenace

LH20AN+750mm Used NSK Linear Bearing THK HSR20R Japan LM Guide CNC Lathe Route

2RSR9WN+190L THK Miniature Used LM Guide Linear Bearing 2Rail 4Block no preload 

Miniature LM Guide RSR15VM+640mm Used preload adjustable bracket THK Linear Bear

HSR15A2UU+818mm Used THK Linear Bearing 2Rail 4Block LM Guide NSK CNC Route

HSR15RQZUU Lot of 2 Used THK Linear Bearing LM Guide Block cartridge maintenance

THK LM Guide Used HSR30A+790mm Linear Actuator Bearing CNC Route 2Rail 4Block

LM20MGA Used THK Stainless Steel / Lot of 2 /LM20 Ball Bush for High temperature

NR35LR2UU+520L THK Linear Motion Bearing Used LM Guide for Heavy weight Axis

HSR25R2UU+1110mm Used THK LM Guide 2Rail 4Block NSK Linear Bearing CNC Mill Rout

LM Guide Used THK HSR15A2UU+280mm Linear Bearing 2Rail 4Block Lathe CNC Route 

THK HRW21 Rail with preload adjustable block HR1123 Used 1Rail 2Block 380mm

SRN45LR+880mm THK Caged Roller Linear Bearing Used LM Guide Ultra High Rigidity 

THK RSR15N Type Used MNN15-G1+590mm SCHNEEBERGER Linear Bearing 2R 4Blocks RSR

Carriages KWVE15B INA Linear Bearing Lot of 2 LM Guide Block New for Maintenance

HCR15A+60/400R Round Linear Bearing Used R Guide LM THK Curve Motion Circular Sy

Linear Bearing HSR20R+1190mm Used THK LM Guide 2Rail 4Block NSK,IKO CNC Route

HRW17CA+470mm Used THK Wide LM Guide Linear Motion Bearing IKO,NSK 1Rail 2Block

THK HCR25AUU+30/500R 1Rail 1Block Used Round Motion Curve LM Guide bearing