公司名称：厦门岳航计算机工程有限公司

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通信程序的设计
为了充分利用计算机数据处理的强大功能，我们可以采用计算机有优先权的方式，在计算机上编写程序来实现计算机与PLC的通信， 计算机向PLC发出命令发起通信，PLC自动返回响应。本文中采用VB来编写计算机与PLC间的通讯程序。在VB中提供了通信控件—应用通信控件(MSCOMM)，实现通过串行端口传送和接受的功能。
下面介绍MSCOMM控件的属性:
*CommPort:设定通信连接端口代号，程序必须指定所要使用的串行端口号，Windows系统使用所设定的端口与外界通信。

SMC INR-498-011C Thermo Chiller Tested

Cosam Entec 1200 Temperature Control Chiller BCU-D152RS1-TEL As-Is

FST Inc FSTC-CD252 Recirculating Chiller Temperature Control Unit

SMC INR-497-001B Dual Channel Thermo Chiller LCD Display Not Tested

Applied Materials AMAT 1 Heat Exchanger 0010-70067 Rev.F untested

AMAT-1 Applied Materials Heater Exchanger 0010-76543 untested as-is

Applied Materials AMAT-1 Heater Exchanger Rev.H 0010-70067 untested as-is

Daikin UBRP3AMX Brine Chilling Unit CoolREF Heat Exchanger Tested

Applied Materials AMAT 1 Heat Exchanger 0242-02163 Rev.D For Parts AS-IS

Trebor 2472-AF Heater 2472-DI untested as-is

Trebor 2472-AD Heater untested as-is

AE Sekidenko OR4000T Optical Fiber Thermometer 955-3001-02 New 0190-33422

Risshi Co. Chiller ELC101-AOZ new 0190-31779 10GPM 15kW 220VAC

SMC INR-498-012C Thermo Chiller not as-is

Coherent Innova Heat Exchanger I328C untested

SMC INR-499-201 Thermo Chiller Heat Exchanger INR-499-201-X02?1 Tested

Lasemtech BCU-L252RS5-TEA?M2 Chiller Temperature Control System Tested As-Is

Lasemtech ENTEC1200 Temperature Control System BCU L252RSU2-TEAM1

HX-150 Neslab 304216060207 Recirculator Chiller AMAT 0010-00570

Entec 1200 Lasemtech BCU-L252RSU2-TE?AM1 Chiller Temperature Control System As-Is

SMC INR-498-P195 Thermo Chiller INR-498-011A As-Is

M and W Systems RPC17-W-CS-DT-L?I-SG-AA-19 Chiller Temperature Controller 4000

Neslab 304229060204 Refrigerated Recirculator Chiller Coolflow HX-150

Neslab 304216060201 Refrigerated Recirculator Chiller Coolflow HX-150

Advanced Thermal Sciences 4083480-001 Temp Control Unit 1231-CCN-GL-004 As-Is

Lasemtech BCU-E210D3-AMAT Dual Chiller Coolend Glycol Supercool 0190-19277 As-Is

Neslab 386105021704 Recirculating The收缓冲区中的字符数。