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PLC控制系統(tǒng)與繼電器控制系統(tǒng)的區(qū)別 ：
⑴ 組成器件不同：繼電器控制線路是許多真正的硬件繼電器組成，而梯形圖則由許多所謂“軟繼電器”組成。
⑵ 觸點數(shù)量不同：硬繼電器的觸點數(shù)量有限，用于控制的繼電器的觸 點數(shù)一般只有4～8對；而梯形圖中每個“軟繼電器”供編程使用的觸點數(shù)有對。
⑶ 實施控制的方法不同：在繼電器控制線路中，實現(xiàn)某種控制是通過各種繼電器之間硬接線解決的。而PLC控制是通過梯形圖即軟件編 程解決的。
⑷ 工作方式不同：在繼電器控制線路中，采用并行工作方式；而在梯形圖的控制線路中，采用串行工作方式
SIEMENS 230V 7W GREEN COLUMN STEADY LIGHT, 8WD4 400-1AC
RIVER CITY SER. 100 SIZE X3 STOWAWAY JACKET 100J
AT SURGICAL CO SIZE XL WHITE ANKLET 36
TELEMECANIQUE 24V 47MA LED CLUSTER LAMP, DL1-BDB4 *NEW*
NUMATICS 052BB4Z2ML00061 SOLENOID VALVE 120 PSIG-AIR NEW
WHIZARD ARMGUARD II PROTECTIVE WEAR CUT RESISTANT SLEEVE SIZE 10 LOT OF 4
JOHNSON & JOHNSON 1/2" WATERPROOF TAPE 10YD BOX OF 18
WILLSON 8.5" X 15" SIZE CLEAR VISOR 4RF26 *NEW*
NORTH V-SAFE RED VALVE COVER 5" TO 6 1/2" VS06 57-322
ONGUARD INDUSTRIES XL 4" RUBBER GALOSHES, 13000HS *NEW*
RASCO 1/2" NPT HORIZONTAL SIDEWALL SPRINKLERS, MODEL F1 *NEW LOT OF 8*
NORTH V-SAFE RED VALVE COVER 2 1/2" TO 5" VS04 57-321
WIKA PRESSURE GUAGE 0-100PSI NEW
SCOTT SAFETY MASK 10008404 NEW
PROFLEX SIZE SMALL TAN LEFT WRIST SUPPORT 4000
FUTURO SIZE X-LARGE NON ROLL ELBOW BRACE 004206
MILLER 310LB. CAPACITY 1-3/4" X 3/64" RETRACTABLE WEB LANYARD, 8327
SCHNEIDER GREEN STACK LIGHT XVBC2B3DB
METEORLITE 5 12-72VDC ORANGE FORKLIFT STROBE
FEDERAL SIGNAL 120V WARNING LIGHT 400F 40S11N NEW
DOLAN JENNER SAFE SCAN 7 SAFETY LIGHT CURTAIN SET SS7-28B *NEW*
ALLEN BRADLEY 110/115-120V SAFETY CONTROL RELAY SERIES D 700S-P220A1
HOWARD LEIGHT HEARING PROTECTION QB2HYG NEW
M28 8.96 PRESSURE GAUGE NEW
TELEMECANIQUE BA 15D-10W MAX, RED BEACON LIGHT XVB L4M4 *NEW*
SMC AL40-03 1.0MPA LUBRICATOR NEW
ALLEN BRADLEY 33 1/2" OAL PERIMETER TRIM 440F-M1515EYSN SER A *LOT OF 4 NEW*
ONGUARD SIZE 3XL JACKET W/ ATTACHED HOOD 79034
RIVER CITY SIZE LARGE 42-44 TEMPEST COAT, 090C SERIES 090 *NEW*
POWER STEERING PUMP D8AC-3A578-AC
OCCU NOMIX ANTI-VIBRATION GEL GLOVES 422 PAIR SIZE S
ALLEN BRADLEY * 1-1/4" DIAMETER RETRO REFLECTOR * 92-47 SER. B
EDWARDS 24VDC .3A STROBE LIGHT, 98BB-G1 *NEW*
1 PAIR SIZE SMALL STEEL GRIP ARM GUARD CN8209S NNB
RIVER CITY SIZE XXXLARGE 54-56 CLASSIC COAT, 200C SERIES 200 *NEW*
RIVER CITY SIZE LARGE 42-44 STOWAWAY COAT, 100C SERIES 100 *NEW*
ELECTRO-MATIC 24V 4" STACK LIGHT W/ CONNECTION ELEMENT, EMSL31QXXXX1-10 *NEW*
URIE BLANTON 15-1/2" x 9" x 0.040" FACESHIELD 075-0040 *LOT OF 22, NEW*
SALISBURY 12/11-1/2 PROTECTIVE GLOVES 156
GUARD MASTER LIFELINE 4 SAFETY SWITCH IEC-947-5-1
LA CROSSE SIZE 10 YELLOW PACK LITE 13" OVERSHOES
RIVER CITY SER. 200 SIZE X4 CLASSIC JACKET 200J
PARKER 250PSI SAFETY RELIEF VALVE H4 *NEW*
SMC VQ4501-5W VALVE 0.2-1.0MPA VQ4H19 NIB
SMC CYLINDER CQ2KB32-35D 145PSI 1.0 MPA NEW
TELEMACANIQUE SCHNEIDER ELECTRIC GREEN SIGNAL LIGHT XVB C2B3
LIGHTALARMS 12VDC 12W REMOTE LIGHT FIXTURE, ELF645/L12-M 12 *NEW*
MAGID SIZE 12 YELLOW OVERSHOE RUBBER BOOTS B1548-12 NIB
ADAPTABEACON 24VDC VISUAL SIGNALING APPLIANCE 104SLEDG-G1
3M W-9410-3 PLASTIC FACE SHIELD COVERS 5-1/2"X10-1/2" BOX OF 196, NIB
SMC VQ5401-5W-X15 VALVE NEW
FEDERAL SIGNAL 24V LITESTAK LIGHT MODULE LSL-024B SER. A3 *NEW*
PILZ 24VAC/DC 3N/O 1N/C 2W SAFETY RELAY PNOZ X1
FEDERAL SIGNAL DIVISION ORANGE LENS KIT K8447014A-02 *NEW*
OMRON 100-240V- AC 12V 0.9A CLASS 2 POWER SUPPLY S82K-03012 NEW OTHER
SERVUS STRETCH-TITE SIZE MEDIUM YELLOW OVERSHOE, B7994 *NEW*
GE 120V 60HZ .60A FLUORESCENT EMERGENCY LIGHTING KIT 8G5750-C *NEW*
SCHNEIDER YELLOW STACK LIGHT XVBC2B8DB
ALLEN BRADLEY 24VAC/DC 0.271A STEADY INCANDESCENT STACK LIGHT, 855T-B24DN4 *NEW*
ARROW HART YELLOW WEATHER PROTECTIVE BM1 BOOT NEW
LACROSSE MENS PACK-LITE YELLOW 11" OVERSHOE SIZE 6 NIB
LITHONIA LIGHTING 120/277V WHITE STEEL EMERGENCY LED EXIT SIGN LX-S-W-3-R
TAMRON LTC-16M LENS 2/3" 16MM F1.4LCK
SELLSTROM 32130 FACESHIELD WINDOW REPLACEMENT, NEW IN BAG
TELEMECANIQUE 7W 240V GREEN LENS STACK LIGHT XVA-L3C 99065
PILZ SAFETY RELAY PNOZ X3P 24-240VACDC 3N/O 1N/C 1SO
CKD B2019-2-NLP REGULATOR NEW
SMC G46-10-02 PRESSURE GUAGE NEW
BABBITT ADJUSTABLE SPROCKET #2 1/2 NEW
MURTFELDT, SPANN BOX CHAIN TENSIONER G1 ASA-60 NNB
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