为什么工控界更信任PLC，选择PLC作为工控的核心部件呢，主要是由于PLC的以下五个特点：

1. 可靠性高，抗干扰能力强

无触点控制：故障率少；

硬件措施：屏蔽、滤波、隔离；

软件措施：故障检测、信息保护和恢复、警戒时 钟（死循环报警）、程序检验

2. 使用灵活，通用性强

产品系列化，硬件结构模块式，可灵活选用；

软接线逻辑使得PLC能简单轻松的实现各种不同的控制任务，且系统设计周期短。

3. 编程方便，易于掌握

     采用与继电器电路极为相似的梯形图语言，直观易懂， SFC 功能图，使编程更简单方便。

4. 接口简单，维护方便

    可直接与现场强电设备相连接，接口电路模块化。

有完善的自诊断及监视功能，便于查出故障原因，并迅速处理。

5. 功能完善，性价比高

     除逻辑控制，定时计数，数字运算外，配合特殊功能模块还可以实现点位控制， PID 运算，过程控制，数字控制等功能，还可与上位机通信，远程控制等

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PPC MECHANICAL SEAL 1-1/2" P-3F 316/VITON #10 CAR SC/HC/18-8 1500-P3F-SP-1-P

PRECISION DIGITAL PD750-3-16 UNIVERSAL TEMPERATURE METER 115 V

PRESSOTECHNIK D-88250 PRESSURE SWITCH 0-6000 PSI

PRIZM EMERSON 2950-8000 REV C DRIVE 2950-1000-I REV F

PROFAX CFS-302 WELDER FOOT SWITCH

PROMESS PPM 1.5.4 BOARD 04FE1E9C 8000.9200.02 8/02

PROMESS PPM 1.6.9 BOARD CS=FB52 8000.9200.02 8/02

PROMESS PPM 4.0.2 BOARD 049C9C0E 8000.9200.02 8/02

PROMESS PPM 4.0.2 BOARD 049C9C0E 80000.92000.01 4/99

PROTEUS INDUSTRIES MODEL 9806SN10F3RP2 FLOW METER

PROTEUS INDUSTRIES MODEL 9806SN10F3RP4 FLOW METER

PROXIMITY MODEL GSD3DT LEVEL CONTROL 15 AMP 125,250 OR 480 V

PRX N12AA9 TRANSISTOR/POWER BLOCK

QUARTECH MODEL 8711 MESSAGE DISPLAY NOT TESTED AS-IS

QUICK CHARGE MODEL OBAE12V/25A ON BOARD CHARGER 12V 25 AMP

RACINE FD4-DSHS-1010D-01 HYDRAULIC SOLENOID VALVE 3000 PSI 115V COIL

RACINE FD4-DSHS-101S-30 HYDRAULIC SOLENOID VALVE 110/115V COIL

RACINE FD4-DSKS-702S-52 SOLENOID VALVE 110/115 V COIL

RACINE FD4-DTHS-101SD-32 HYDRAULIC SOLENOID VALVE 110/115 V COIL

RAYTEK RAYIT5CFS CIRCUIT BOARD

REBUILT ENERPAC SC3 SWING CYLINDER

REBUILT VICKERS DG4S4-012N-U-N-60 110/120V COIL DIRECTIONAL SOLENOID VALVE

RECESSED EDGE-LIT RELZXTE1RCA LED EXIT SIGN A.C. ONLY 120/277V SINGLE FACE

RED LION # APLIA410 APOLLO CURRENT METER AC 230 V

RED LION APLID400 DC CURRENT METER

RED LION APLVD410 DC VOLT APOLLO VOLTMETER

RED LION CONTROLS GEM52 PRESETTABLE DUAL RATE INDICATOR

RED LION CT020050 CURRENT TRANSFORMER

RED LION DITAK IID MODEL 104 DIGITAL TACHOMETER

RED LION IFMR0066 SPEED SWITCH MODULE

RED LION LB00646 PRESET TIMER

RED LION LMPC0000 LOGIC MAGNETIC PICK UP

RED LION MODEL LSCD0010 DOUBLE SHAFT LENGHT SENSOR

RED LION PBLT0600 6-DIGIT TOTALIZER

RED LION RPGQ0500 PULSE GENERATOR

RED LION T48SERIES MODEL T4820010 TEMPERATURE CONTROLLER

REES # 01795-200 LIMIT SWITCH

REES 00294-002 RED SINGLE PUSHBUTTON SWITCH

REES 00662-001 BLACK MUSHROOM PLUNGER PUSHBUTTON SWITCH SIZE 2-1/4" KNOB

REES 00662-004 2-1/4" MUSHROOM PLUNGER PUSHBUTTON SWITCH YELLOW

REES 01461-202 2-1/4" RED MUSHROOM PLUNGER PUSHBUTTON SWITCH

REES 02761-002 2-1/4" RED MUSHROOM PLUNGER PUSHBUTTON SWITCH

REGENT'S ACCUMAX24-32 CLUTCH/BRAKE CONTROL WITH OVER-ENERGIZATION 24V

REGENT'S FORERUNNER 32 CLUTCH/BRAKE CONTROL POWER SUPPLY

REISHAUER STROMVERSORGUNG # 00699202 POWER SUPPLY

RELAY AND CONTROL MODEL RS-5 MOTOR REVERSING DRUM CONTROL SWITCH UP TO 7.5HP

RELIANCE 0-49009-1 CARDPAK TRANSDUCTOR

RELIANCE 0-49012-A CARDPAK VOLTAGE SENSITIVE RELAY

RELIANCE 0-49029 CARDPAK TRIP

RELIANCE CARDPAK 0-49001-8 POWER SUPPLY

RELIANCE CARDPAK 0-49004 D.C. AMPLIFIER

RELIANCE CARDPAK 0-49009-1 TRANSDUCTOR

RELIANCE CARDPAK 0-49009-10 TRANSDUCTOR

RELIANCE CARDPAK 0-49009-3 TRANSDUCTOR

RELIANCE CARDPAK 0-49017-2 SUMMING CIRCUIT-CARD

RELIANCE CARDPAK 0-49017-21 SUMMING

RELIANCE CARDPAK 0-49043 AMPLIFIER

RELIANCE ELECTRIC 0-60028-2 GATE DRIVER INTERFACE

RELIANCE ELECTRIC 0-60029-1A INTERFACE CARD

RELIANCE ELECTRIC 704323-11C HC24-501POWER SUPPLY

RELIANCE ELECTRIC IQ010BS3007NH-0 PERSONALITY MODULE

RENISHAW ACC2 AUTOCHANGE CONTROL UNIT, POWER CABLE NOT INCLUDED

REPAIRED BY ELECTRICAL SOUTH NORDSON 276883 DIGITAL READOUT

REPAIRED COMPUTECHNIC P6S520 6 HS CONTROL BOARD

REPAIRED LOGANSPORT 601-60I-RFL PRESSURE CONTROL

REPAIRED NORDSON MODEL 2304 SD CONTROL PANEL ASSEMBLY

REPAIRED TEXAS INSTRUMENTS STI-3200 TIMER/COUNTER

REPAIRED UNICO 306-563-1-9231 PCB BOARD

REPAIRED UNICO 309482.40632 309482.4-0632 INTERFACE MEMORY MODULE

RESIN HWS30-12/A POWER SUPPLY

REVERE TRANSDUCERS MODEL B5102-200-10P1 LOAD SELL

REX REXNORD ZT2-2100 TAKE-UP BEARING 1" BORE

REXNORD 06B-1 ROLLER CHAIN 10' FT

REXNORD 63 BASE CHAIN 10 FT

REXNORD 63 BASE CHAIN 10 FT

REXNORD LINK BELT FC4U232N FLANGE BALL BEARING

REXNORD TABLETOP CHAIN 863-BC 863 C/S BASE CHAIN

REXROTH 0-821-301-400 0821301-400 FILTER

REXROTH 4WE10F31/CW110N9DA HYDRAULIC VALVE

REXROTH 4WE6-W51/AG24/Z24 SOLENOID VALVE 24 V COIL

REXROTH BOSCH TM-821000-03020 PNEUMATIC AIR CYLINDER 2 X 2

REXROTH BOSCH TM-821000-03030 2X3 PNEUMATIC CYLINDER R432022311

REXROTH BOSCH TM-831000-00020 PNEUMATIC AIR CYLINDER 2-1/2 X 2