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PLC作为一种高性能的控制装置，在分布式系统中得到了越来越广泛的应用。在这种控制方式中，上位监控机系统是其中重要的组成部分。PLC可以多种方式如直接采用现有的组态软件与上位监迭机通信，但针对小规模的控制系统，找到一种高性能价格比的通信方法，
1通信装置的硬件描述
PLC与PC机之间实现通道，可使二者互补功能上的不足，PLC用于控制方面既方便又可靠，而PC机在图形显示、数据处理、打印报表以及中文显示等方面有很强的功能。因此，各PLC制造厂家纷纷开发了适用于本公司的各种型号PLC与PC机通信的接口模块。三菱公司开发的FX-232AW接口模块用于FX2系列PLC与计算机通信。还有与以太网连接的接口模块AJ71E71、与MAP网连接的接口模块AJ71M51-S1、与FAIS MAP网连接的接口模块AJ71M51M1等。不同的通信方式，有着不同的成本价格和不同的适用范围。在此介绍一种通过PC机的RS-232口与PLC进行通信的实现方法。
FX2系列PLC的编程接口采用RS-422标准，而计算机的串行口采用RS-232标准。因此，作为实现PLC计算机通信的接口电路，必须将RS-422标准转换成RS-232标准。
RS-232与RS-422标准在信号的传送、逻辑电平均不相同。
ESAB RI-3P ROBOTIC INTERFACE MICROPROCESSOR CONTROL
GENERAL ELECTRIC 080B20D CONTACT BLOCKS LOT OF 12
HONEYWELL DC200H-0-000-1F0000-0 UDC2000 MINI PRO
FANUC A05B-2051-C901 FAN UNIT
FANUC A05B-2051-C903 FAN ASSEMBLY
LEUKHARDT 713.03.2.200.A PCB
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YASKAWA JANCD-1003E BOARD W/ JANCD-EW02
MURRELECKTRONIK 63016 AMPLIFIER BASE NIB
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ALLEN BRADLEY 20B D 052 A 3 AYANRD0 PowerFlex 700
ALLEN BRALDEY 1336S-B030-AA-E?N5-GM1-HA2-L4 AC DRIVE
NEO-DYN 130P12C3 ADJUSTABLE PRESSURE SWITCH NEW
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DEMEX PD715 INTEGRATED PERSONAL DIS**Y
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COMPUTER DYNAMICS DP017240 ACCESS-C10 COMPUTER
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ALLEN BRADLEY 1326-CCU-015 CABLE ASSEMBLY NIB
SPORLAN PFE12CP60 THERMOSTATIC EXPANSION VALVE, NIB
ASCO JKF8210G2 PILOT OPERATED SOLENOID VALVE, NIB
ALLEN BRADLEY 1756-A13 CONTROL LOGIX CHASSIS W/ PWRSUP*
GE TED136015 15A INDUSTRIAL CIRCUIT BREAKER
BECKHOFF C9900-A167 DVI-D/USB1.1 EXTENDER / - RX
LAMBDA LJS-11A-24-OV POWER SUPPLY UNIT
ORIENTAL MOTOR MU1238A-51B ORIX AXIAL FLOW FAN, NIB
ENERTROLS HP-9000-R-PSC HIGH PRECISION SHOCK ABSORBER
HITACHI RGW-225B 225 AMP EARTH LEAKAGE CIRCUIT BREAKER
AC/DC ELECTRONICS 5N6-1 POWER SUPPLY, NIB
MANNESMANN REXROTH 4WE10D31 / CW110N9DAL VALVE NEW
GENERAL ELECTRIC CR151KJC22CU FUSE BLOCKS LOT OF 6
COOPER CROUSE HINDS DM4R2M08E060M MICRO MINI CONNECTOR
TIMKEN 25820 RACE NIB
LITTLE GIANT 680-2016 MODULE, NEW
REXCON DIE SENTRY II DS II OPERATOR PANEL USED
FANUC A03B-0801-C129 INPUT MODULE IA16E
FANUC A03B-0801-C117 MODULE
GRACO EH 433 GT Hydra-Spray AIRLESS PAINT SPRAYER
TRERICE 450LFB 0-160 PSI PROCESS GAUGE, NIB
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ALLEN BRADLEY 6160-T53 SER B T53 PROGRAMMING TERMINAL
ELAU SM 100-30-080-P0-45-S1-B0 SERVO MOTOR
IBM TRAVELSTAR DJSA-205 5 GB HARD DISK DRIVE
ELAU SB105-40-02-05-19-S-R1-64-EOKN SERVO MOTOR
ELAU SB105-30-04-05-19-S-R1-64-EOKN AC SERVO MOTOR
ELAU SB105-40-04-05-1-SR-64-EOKN AC SERVO MOTOR
OMEGA HH508 DIGITAL THERMOMETERS LOT OF 2
JOKAB SAFETY JSBT4 SAFETY RELAY
ROSEMOUNT 0142-01-13-54 CONDUCTIVIY SENSOR, NIB
CHESTERTON 280 DUAL CARTRIDGE STACK SEAL, NIB
FANUC A03B-0801-C445 OA16D OUTPUT MODULE
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YASKAWA ELECTRIC JANCD-I004C MOTOMAN PC BOARD
MAX MACHINERY 284-522 FREQUENCY TRANSMITTER
FANUC A03B-0801-C462 RC01C ROBOT CONTROL
SQUARE D F8 M1 CIRCUIT BREAKER
BOSCH LTC 0335/20 DIGITAL MONOCHROME CAMERAS, LOT OF 2
SYMBOL CN410 BARCODE SCANNER
ALLEN BRADLEY 2711-T6C20L1X / B FRN 4.43 PANELVIEW 600
ALLEN BRADLEY 2711-T10C20 ENET PANELVIEW 1000