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计算机可对PLC内各软设备进行读、写和强制ON/OFF操作。除开PLC的计时器和计数器的设定值采用常数时，以及文件寄存器内的数据，FX2系列PLC的所有开关量输入、输出以及各软件设备对计算机都是透明的。其操作时的多字符帧的格式如图3所示。但不同的操作在“多个字符”项内有所不同。例如，计算机对PLC的软设备Y20～Y37进行读操作，查装置地址表为00A2，读取2字节数据。其状态如图6（a）所示，主机发出的命令格式如图6（b）所示，PLC返回的信息如图6（c）所示。
如传送的命令有错误，PLC返回NAK信号，本次操作失败，重新进行。
为了保证主机与PLC的通信准确无误，上位机也必须按通信协议进行和校。如接收的信息有误，则重新读取。如重复3次仍不行，则显示错误信息。
使用C语言很容易实现以上编程。
主机还可向PLC写数据，进行单点的强近置位和复位。
对于运行在控制和实验室环境飞速下本方案运行可靠、性价比高、体积小、但是对于通信距离长，环境恶劣的发问，需加光电隔离等措施。
OMRON G3NA-21OB RELAY NIB
TELEMECANIQUE LA1DN13 RELAY
ELECTROCUBE RG 2409-8 RESISTOR LOT OF 2
GRACO 206 393 MONARCH AIR POWERED PUMP
GRACO 220-563 PRESIDENT AIR POWERED PUMP
GRACO 220-568 PRESIDENT AIR POWERED PUMP
ATLAS COPCO QMM 340 25 4240 0308 80 SERVO MOTOR CONTROL
ATLAS COPCO QMS 340 25 4240 0312 81 SERVO MOTOR CONTROL
ATLAS COPCO QMS 340 25 4240 0312 81 SERVO MOTOR CONTROL
ATLAS COPCO QMM 340 25 4240 0308 80 SERVO MOTOR CONTROL
GRACO 206-796 MONARCH AIR POWERED PUMP
GRACO 204-445 PRESIDENT AIR POWERED PUMP
GRACO 217-623 PRESIDENT AIR POWERED PUMP
GRACO 220-658 AIR POWERED PUMP
GRACO 228-527 AIR POWERED PUMP
GRACO LSA-117 AGITATOR W/ HP MOTOR
BANNER MDSDINT-1L2 MINI-SCREEN CONTROL MODULES
REXROTH 0 608 830 162 TIGHTENING CONTROLLER
INDRAMAT PPC-R02.2N-N-T2-B2-NN-FW RECO CONTROLLER
SQUARE D AT7000 TFRC ReatiVar POWER FACTOR CAPACITOR
UFM SM-FSF6GM-6-32V1.0-M3WR-PC4M-C-Z86-1.5D FLOW METER
UFM SM-NSF7GM-3-32V1.0-M3WR-PC4M-DC-C-Z86-4U FLOW METER
UFM LL-ZZMSF1GM-4L-32V1.0-M3WP-R04M-C-1D FLOW METER
UFM SM-NSF8GM-6-32V1.0-M3WR-PC4M-C-Z86-3D FLOW METER
UFM MN-FS10GM-8-32V1.0-M3WR-PC4M-C-Z86-2D FLOW METER
UFM SH-NSF8GM-6-32V1.0-M3WR-PC4M-C FLOW METER, NNB
SQUARE D MV6000 ReactiVar MVA PF CORRECTION BANK LOT 2
600 KVAR TOTAL
REXROTH IKS4374 INDRAMAT MOTOR ENCODER CABLE 10 METERS
ALLEN BRADLEY 700DC-F310 CONTROL RELAY SER. C LOT OF 30
VICKERS 507848 VALVE SOLENOID COIL NIB
**ST QG030-303/14 CROSS AIR FLOW COOLING FAN NEW NB
BALLUFF BTL2-A10-0610-Z-S32 MICROPULSE TRANSDUCER
SIEMENS 6FC9320-3KA00 INCREMENTAL POSITION ENCODER NIB
HELICOID 900 SERIES PRESSURE GAUGE 0-1000 PSI NIB
G.E. SEFR1 HANDLE MECHANISM FOR SE150, SF250 NNB
FLOWDATA DC05E-4119-5105-000 FLOW TECHNOLOGY GAUGE NNB
HUMPHREY R456-250AE1 SOLENOID VALVE
HUMPHREY 250E1-3-11-21-36 SOLENOID VALVE
BALLUFF BTL2-A10-0610-Z-SB34-S32 MICROPULSE TRANSDUCER
JOHNSON CONTROLS P70MA-1 DUAL PRESSURE CONTROLLER
VICKERS DGMX2-3-PP-AW-B-40 PRESS. RED. SYSTEMSTAK VALVE
PARKER SPF600B HYDRAULIC FLOW CONTROL VALVE
TELEMECANIQUE D2V2Y PILOT LIGHT BEZEL LOT OF 2
TURCK RKM 30-2M CABLE
TURCK VB2-RS 4.4T-2.2FKM 4.4/S651 CABLE
TURCK VBRS 4.5-2RK 4T-0.30/S90/S818 CABLE
TURCK KBV 4T-2 CABLE
TURCK VAS 22-D563-5M CABLE
TURCK WK 4T-4 CABLE
TURCK VAS 22-F653-2M-RS 5.3T CABLE
TURCK WKC 4.4T-6 CABLE
TURCK PKG 4-6 CABLE
TURCK WBK-3T-2-SB 3T CABLE
TURCK BI 2-G12-AZ33X CABLE
TURCK WK 4.5-1-WS 4.5T CABLE
TURCK BIM-AKT-AD4X CABLE
TURCK WK 4T-10 CABLE