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计算机与PLC之间的通信是建立在以RS232标准为基础的异步双向通信上的，FX系列PLC有其特定的通信格式，整个通信系统采用上位机主动的通信方式，PLC内部不需要编写专门的通信程序，只要把数据存放在相应的数据寄存器中即可，每个数据寄存器都有相应的物理通信地址，通信时计算机直接对物理通信地址进行操作.
可编程序控制器（PLC）是综合了计算机技术、自动控制技术和通信技术的新型的、通用的自动控制装置。它具有功能强、可靠性高、使用灵活方便、易于编程及适应性强等一系列优点。近年来，它在工业自动化、机电一体化、传统产业技术等方面的应用越来越广，成为现代工业控制的三大支柱之一。其紧凑的设计、良好的扩展性、低廉的价格、强大的指令以及较高的可靠性和简便的维护,近乎完美的满足了小规模的控制要求。压缩机组是动力的核心，从避免事故和对机组保护的角度考虑，对机组的温度、压力、和防喘震等都设计了严密的联锁程序，在机组正常运转过程中，一旦有控制参数超标或有危害机组安全的因素，控制系统都要按照联锁保护程序做出相应的处理。PLC处理功能强大、扫描速度快，抗干扰能力强，在机组的联锁保护系统中得到了广泛的应用。
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SCHLEICHER MDE214-48
AB 100L-A20ND4
Siemens 6SE3190-0XX87-8BF0
Pilz PNOZXV2P
Siemens 3RT1055-6AP36
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Simatic 470-7LA12
Festo DNC-32-500-PPV-A
Simatic 451-4UA13
AB 1756IB32
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GENO-Rohrtrenner RTB1DN25
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MURR MDG3040024
Simatic 158-0AD00-0XA0
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Schneider TSXDPZ10D2A
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Herberholz GTD-096/090-V17-G
3HAB6182-1 ABB ELECTRONIC CIRCUIT BOARD REMANUFACTURED
TSXFPP20 SCHNEIDER AUTOMATION ELECTRONIC CIRCUIT BOARD REMANUFACTURED
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K1SXR-A GFM ELECTRONIC CIRCUIT BOARD REMANUFACTURED
A20B-0008-0461/?04A FANUC ELECTRONIC CIRCUIT BOARD REMANUFACTURED
92-00226-03 MODICON ELECTRONIC CIRCUIT BOARD NEW
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PMA 9404 407 72002-011
VWR 986962
PARKER OEM300
1756-ENBT-A
ADVANTECH PCM-9690
FORE ASX-200bx
YASKAWA SGDH-01BE h
HP 04085-66562
Advantech IPC-100 - 1U
ADVANTECH PCA-6276.
NOVELLUS 60-139978-00
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HEIDENHAIN 369428-06
ADVANTECH MIC-3301
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Advantech PCI-6881
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ANORAD PC-SERV-3
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1771-OBD
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AML 149-0831-30
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N/A VIEW ENGINEERING ELECTRONIC CIRCUIT BOARD NEW
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6203530500 MARPOSS ELECTRONIC CIRCUIT BOARD NEW
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APPLIED 3870-02579
DELTA 603672-109
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Spellman PTV5P300X2094
BIRD DA-140/AD
MKS 290C-12272
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Honeywell RM7840L1075
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Cutler MD510 857D505G02
Trane 97G8825
Rosemount TG4A2A21AM504
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Flygt .172-1220040
TRANE X13650401-10
AB 2112B-BDBD-17-24R-41-9018Q
KOOLTRONIC 2000BTU
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ABB 1891-1
ABB 32508
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ABB 125A
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