Honeywell 51304156-100 

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1) 對(duì)可靠性要求較高的應(yīng)用場(chǎng)合，冗余設(shè)計(jì)和降級(jí)操作是必要的。冗余設(shè)計(jì)可采用熱后備或冷后備方式。熱后備方式操作時(shí)，冗余的后備系統(tǒng)也同時(shí)運(yùn)行，兩者輸出的結(jié)果一致時(shí)，表示系統(tǒng)是正常運(yùn)行的；一旦結(jié)果不一致，則發(fā)出警報(bào)信號(hào)，同時(shí)，根據(jù)自診斷的結(jié)果，切換到正常的系統(tǒng)去。冷后備方式操作時(shí)，冷后備系統(tǒng)不運(yùn)行，它在自診斷檢測(cè)出運(yùn)行系統(tǒng)故障后才切入后備系統(tǒng)。對(duì)PLC來(lái)說(shuō)，冗余系統(tǒng)的范圍主要是CPU、存儲(chǔ)單元、電源系統(tǒng)和通信系統(tǒng)，只有在可靠性要求很高時(shí)，才會(huì)包括輸入輸出單元的冗余等。

    2) 降級(jí)操作是指在設(shè)計(jì)時(shí)，將手動(dòng)操作包括在內(nèi)的設(shè)計(jì)。例如，緊急停車的設(shè)計(jì)，關(guān)鍵設(shè)備的開(kāi)停和再啟動(dòng)功能的設(shè)計(jì)等。這樣，一旦發(fā)生故障，可采用降級(jí)的操作，即對(duì)部分或全部設(shè)備進(jìn)行手動(dòng)的開(kāi)停操作，以避免設(shè)備的損壞或?qū)θ藛T的傷害。此外，在設(shè)計(jì)中也可考慮從全自動(dòng)到半自動(dòng)、直至手動(dòng)的操作等。

ROCKWELL 31D102 E W/ 1B 1/4'' JACOBS CHUCK PISTOL GRIP PNEUMATIC DRILL
 
DODGE TAPER LOCK BUSHING 117079 1210x 7/8 NIB
 
NUPLA * QUICK CHANGE HAMMER WITH SOFT FACE TIPS * S-105
 
GFM ITS-3 115VAC 80VA
 
NYTD NO.40 JOBBER LENGTH DRILL BIT NIB, 18 IN BAG 100329
 
SPECTROLINE ULTRAVIOLET LEAK DETECTOR LAMP FL-100/12
 
ATLAS COPOS PNEUMATIC NUT RUNNER LME44-A4-TR4404 RPM 420
 
CLEVELAND TWIST DRILL COMPANY 1851x1553 DRILL BIT 12ZC-2760 *NEW*
 
STARLIFT ROD CT6R8891 / B66QG/00 NIB
 
DANIEL WOODHEAD CO. RECEPTACLE TENSION TESTER
 
FIXED RENEWABLE CHIP BREAKER DRILL BUSHING 15/32 LOT OF 2
 
SJ-PA DRILL CHUCK 3/16 DR 09459
 
BERNARD EZ FEED II MIG WELDING GUN 2-4312AL *NIB*
 
COFFING 1TON CHAIN HOIST LHH TA0293
 
PUTNAM TOOL CO 17/32 X 25/32 CS34M-2
 
MACKLANBURG-DUN?CAN CAULKING GUN *NEW*
 
STANLEY A32LRA1CT-9 MOTOR
 
PTD 1/8" HSS TWIST DRILL TAPER SHANK NIB 059608
 
SPORLAN CATCH-ALL 500PSIG FILTER DRIER 407G / C-607-S NIB
 
BILZ TAP COLLET HOLDER WFLC115-0, HSK-C40 *NEW*
 
APW MCLEAN BLOWER ASSEMBLY 28-1064-01M
 
NAPA GOLD FUEL FILTER 33118 LOT OF 2
 
CARBOLOGY SYSTEMS INSERTED TOOL HOLDER MTFNR-16-4
 
MARTIN 27-TOOTH SPROCKET 50B27
 
AMERICAN AUTOGARD TORQUE LIMITER 401-2
 
PARKER FILTER 901494 10C WP NIB
 
DIXON F-200 2'' BRASS CAM-LOCK MALE FITTING
 
NORTH AMERICAN 25/32-18 NS HS GH-3
 
NIOSH MSHA RESPIRATOR MASK 66M / TC-23C-779
 
CARBOLOGY INSERTED TOOL HOLDER MTSNL-16-4
 
PTD CO. 3/8" HSS TWIST DRILL TAPER SHANK 020024 / 209 NIB
 
SKF SPHERICAL PLAIN ROLLER BEARING NIB GE25 TE-2RS
 
MECHLOK P.L.PORTER LATCH STEEL MM15-1010
 
MARSH INSTRUMENT CO. 0-100PSI 0-7KG/CM2 PRESSURE GAUGE 13842
 
MR&TC 8-FLUTES 15/16 10" HS TWIST END MILL
 
INDRESCO DS-D22 JACOBS 3/8" CHUCK PISTOL GRIP PNEUMATIC SCREWDRIVER
 
SIMPSON 260 OVERLOAD PROTECTED ANALOG MULTIMETER IN CASE 6XLPM
 
ROCKWELL 35FC322 MODEL C,1/4'' HEX DRIVE PNEUMATIC PISTOL GRIP SCREWDRIVER
 
PTD CO. 35/64 HSS JOBBER LENGTH BLACK OXIDE TAPER SHANK 010035 R10 NIB
 
NORGREN GRIPPER GL400-J11F-1-X-?1-G-X-E-4 153254/40
 
FIXED RENEWABLE CHIP BREAKER DRILL BUSHING 5/16 LOT OF 3
 
INGERSOLL FACEMILL 6K1A06R03-9 NIB
 
15FT ROLL OF PTFE CONDUIT CONVOLUTED HOSE 939B-32
 
PANASONIC MDX00008 35DEB1 NIB
 
STARRETT OUTSIDE MICROMETER IN CASE NO.436
 
NORTON METALITE 2"X54" 40-X GRIT PLYWELD BELT NIB, 10 IN BOX R228 104605
 
2" ARROW PISTON LOT OF 11
 
ASI 1.125 SEAL ASSEMBLY NIB 200I18A-01AA9S


DFS COMBO DRILL BIT AND DRIVER NIB CST-150S
 
61-64" COLLET 5C
 
STEEL M30 x 3.50 HS PLUG TAP
 
DICHTOMATIK TCM OIL SEAL 35X52X7TC-BX NIB
 
GREEN STM 105014H LOT OF 2 NNB
 
THERMOSTATIC YARWAY STEAM TRAP 3/4 " 151 300PSI 500F
 
NS 9/16" 2-FLUTE TWIST DRILL TAPER SHANK