KJ3202X1-BA1

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PLC扫描工作过程除了执行用户程序外，在每次扫描工作过程中还要完成内部处理、通信服务工作。如图2-11所示，整个扫描工作过程包括内部处理、通信服务、输入采样、程序执行、输出刷新五个阶段。整个过程扫描执行一遍所需的时间称为扫描周期。扫描周期与CPU运行速度、PLC硬件配置及用户程序长短有关，典型值为1～100ms。

在内部处理阶段，进行PLC自检，检查内部硬件是否正常，对监视定时器（WDT）复位以及完成其它一些内部处理工作。

在通信服务阶段，PLC与其它智能装置实现通信，响应编程器键入的命令，更新编程器的显示内容等。 当PLC处于停止（STOP）状态时，只完成内部处理和通信服务工作。当PLC处于运行（RUN）状态时，除完成内部处理和通信服务工作外，还要完成输入采样、程序执行、输出刷新工作。

PLC的扫描工作方式简单直观，便于程序的设计，并为可靠运行提供了保障。当PLC扫描到的指令被执行后，其结果马上就被后面将要扫描到的指令所利用， 而且还可通过CPU内部设置的监视定时器来监视每次扫描是否超过规定时间，避免由于CPU内部故障使程序执行进入死循环。

KITZ 2-1503x032 SS Flanged Ball valve B16.5 CF8M

PSA / Email Flanged ball valve 2-150 CF8M SS 2 IN

Spirax Sarco SM45 Bimetallic steam trap .75 inch PN 63 GS22M04 W3282

Hancock Tyco AP 1602 Gate Valve 1.5 inch Class 800: Ends SW : body A105N

TLV A65S 

TLV A65S MG37488

ARMSTRONG 1811 1/2 inch SS Steam Trap NEW

SPIRAX SARCO SPB 30 H SS Steam Trap Y384 /304 NEW

ARMSTRONG 1010 1/2 inch SS Steam Trap NEW

VELAN 3/4 inch SW + thread gate valve Class 800 105N steel NEW

Flanged ball valve 2-150 CF8M SS 2 IN - 150LB 80814

RICHARDS 6420 Flanged ball valve SS 2 IN R2450408 / S2460408

NELES JAMESBURY Flanged ball valve 2 inch 2/150 ANSI B16.34 CF8M / 316 SS / MTFE

KITZ 7482 Flanged ball valve 2 inch 2-150 SCS 14 CF8M / 316 SS / MTFE

KITZ 5712 Flanged ball valve 2 inch 2-150 CF8M / 316 SS / MTFE

KITZ GATE VALVE 1-150 V8 82M 1" FLANGED

PROCESS SYSTEMS Series 77 DN25 1 in. SS Ball valve & SR 85 PNUTEC Actuator

Lone Star BX156 DS Soft Iron Ring Joint Gasket Ht No 9055 API 6A-0666 NIB QTY 8

KEYSTONE1-CDF2 100mm Butterfly Valve and Pneumatic Actuator 790

KITZ 1" Flanged ball valve 1-300 300UTBZM-FS(C) CF8M / 316 SS / H-PTFE Recond.

KITZ 2" Flanged ball valve 2-150 WCB / H-PTFE Reconditioned 2012.

Spirax Sarco FT14 Half inch steam trap PN16 GGG40 PMA 16 bar 250 deg C

KEYSTONE TYCO 79U 003 Pneumatic Double Acting Valve Actuator.

Saunders Alfa Laval glass-lined diaphragm valve DN 20 3/4 in -body NEW

RICHARDS 6420 ISO CF 3 CH 50 2inch Flanged Ball Valve

FCX 1.5 inch 1 1/2" forged steel Class 800 socket weld gate valve NEW

TLV Size 15 (1/2") SS3N-21FREE FLOAT STEAM TRAP SUS316L BW NIB

JOHN CRANE 72AT39 Gearbox Manual Drive Valve Actuator Assembly

HYUNDAI Gate Valve - 1.5 inch Class 800: A105N Ends: NPT

SMITH CRANE 3/4 inch flanged gate valve Class 800 105NLC steel NEW

SMITH CRANE 3/4 inch flanged gate valve Class 800 105NLC steel

KLEP Rubber lined Diaphragm Valve 26/VKKRL100D 4" inch DN 100 NEW

Saunders Alfa Laval glass-lined diaphragm valve body DN 25 NEW

KEY VALVE TECHNOLOGIES HIGH PRESSURE PARALLEL SLIDE GATE VALVE F22 12.5 DIN

Hancock Tyco AP 1602 Gate Valve 2 inch Class 800: Ends SW : body A105N

PH 1.5 inch 1 1/2" forged steel Class 800 socket weld gate valve NEW

KEY VALVE TECHNOLOGIES HIGH PRESSURE PARALLEL SLIDE GATE VALVE A 105

Spirax Sarco Drayton Half inch 0.5 in 211/10 Cast iron I/B Steam Trap NPT NEW

TLV Size 15 J3X-21A FREE FLOAT STEAM TRAP GGG403 PN16 DN 15 DGLR NEW W MANUAL

Smith Crane 0.5 inch 1/2" DN 15 forged steel A105NLC flanged gate valve NEW

NEWAY Size 1 Class150 Gate valve, flanged A105N CR 13 Fig 1G1R.C40/8

KEYSTONE TYCO Manually actuated BUTTERFLY VALVE 4 inch Food Grade Stainless NEW

1.25 inch FF BSM butterfly valve with GEBR MULLER pneumatic actuator and switch

Unbranded 3 inch Flanged Ball Valve 3-150 CF8M

KITZ 3 inch Flanged globe Valve 3-150 CF8M

INVENSYS BRA Equimeter 243-12-1 2" BSP Gas regulator Pressure reduction valve

BELIMO BU6 80L 80mm 3in actuated butterfly valve SRVU24-B NEW

GEMINI 1.5 inch Brass BALL VALVE with Model 422 Pneumatic Actuator

RICHARDS 3 inch Flanged Ball Valve 3-150 CF8M

DAFRAM 3 inch Flanged Ball Valve 3-150 CF8M

EL-O-MATIC EL55 Valve Actuator Ex Rated II 2G EEx d IIB T4 KEMA 03ATEX2156 X

EUREKA 4 100mm model 560 Table E brass gate valve - manual operation

Bronze steam service 1 inch (25mm) Control valve NEW

OMB 1.5 inch 1 1/2" forged steel Class 600 BSP A 105N threaded gate valve NEW

K&M 22077 Half inch 1/2 inch Control valve with pneumatic diaphragm Actuator

Spirax Sarco FT14 3/4" 3/4" inch DN 20 BSP Steam Trap New In Box

1.5 inch FF BSM butterfly valve food grade GEBR MULLER pneumatic actuator switch

NORBRO 40R 10-RDB40-1SD1EO?-D Pneumatic Valve Actuator with KITZ 35H2 CXG2 valve

KLEP Rubber lined Diaphragm Valve 26/VKKRL150D 6" inch DN 150 NEW

Consolidated Safety Relief Valve AS1271-3 1"x2" 1905-30FC-2 CAP: 1456 KG/HR AIR

TDS AUSLITE / Tyco DN100 As 2XXXX Resilient Seated Gate Valve NEW

KEYSTONE TYCO F79U 012 4.1 bar SpringPak Single Acting Valve Actuator.

Saunders Alfa Laval glass-lined diaphragm valve DN 40 - body NEW

NEWAY1.5 INCH CLASS150 FLANGED GATE VALVE 10515521 A105N

Two inch FF BSM butterfly valve with GEBR MULLER pneumatic actuator and switch

KITZ 3 inch Flanged Ball Valve 3-150 CF8M

Spirax Sarco FT14 3/4 inch BSP R-L 10 bar Ball Float Steam Trap

EBRO ARMATUREN Manual 232-08 / NA 2G23210-0030 250mm Butterfly valve NEW

Actuated Ball Valve Stainless 2 in c/w BSM adaptor & ACCORD APL2100 positioner

Bronze steam service 1 1/2 inch (40mm) Control valve

TLV Size 15 J3S-X-21 FREE FLOAT STEAM TRAP CF8 / SCS 13A NEW WITH MANUAL

KITZ 2" Flanged 300UTBZM-FS(C) CF8M/316 /H-PTFE ball valve Reconditioned 2012.

KLEP Glass Lined Teflon Diaphragm Valve 2" inch DN 50 NEW

Three inch FF BSM butterfly valve with GEBR MULLER pneumatic actuator and switch

HONEYWELL Centra 3" flanged mixing valve DN80K VS100 6749T - NEW

Boiler sight glass and bronze valves.

HIGH PRESSURE 3 inch MANUALLY ACTUATED GATE VALVE in good used condition

1.25 inch standard BSM SS butterfly valve with MICROMATIC SWITCHED ACTUATOR

Bronze steam service 1 1/2 inch (40mm) Control valve NEW

EMICO Flanged ball valve WCB 1.5IN - 150LB

KEYSTONE TYCO 79U03601XX0PM00 Pneumatic Double Acting Valve Actuator.

PROCESS SYSTEMS Series 77 DN40 1.5 in. SS Ball valve & SR 85 PNUTEC Actuator NEW

K CND 3 inch Flanged check Valve 3-150 CF3

Boiler feed water feedwater tank or hot water stand

Premia P75 240V Metering / Dosing Pump 4.73LPH

KEYSTONE TYCO 79U03601XX0PM00 Double Acting Valve Actuator with pilot valve.

TURNFLO RP253-SR4 actuator with 1 inch flanged ball valve & ACCORD indicator

PISTER 1113 DN 25 SS Ball valve with FLOWSERVE S085D pneumatic actuator NEW

PROCESS SYSTEMS Series 77 DN50 2 in. SS Ball valve & SR 85 PNUTEC Actuator NEW

CRANE 1.5 inch 1 1/2" forged steel Class 300 flanged gate valve NEW

PROCESS SYSTEMS SR-85 Valve Actuator with Ser 77 DN50 Ball Valve Stainless NEW

KITZ 3 inch Flanged globe Valve 3-150 CF8M NEW

FISHER FIELDVUE DVC 6030 digital valve positioner controller for 1/4 turn

OMB 1.5 inch 1 1/2" forged steel A 105N flanged gate valve NEW

GOYEN BLS54BSA316C SS actuated ball valve & SR52 actuat

KLEP Rubber lined Diaphragm Valve 26/VKKRL200D 8" inch DN 200 NEW