描述
PLC的用户也可基于DOS或WINDOWS平台开发用于PLC控制系统的应用软件，以提高PLC系统自动化及智能化水平。这方面的软件已日益受到重视。
总之，为了用好PLC，PLC的支持软件越来越丰富，性能也越来越好，其界面也越来越友好，也因此，它的情况如何，已成为评判PLC性能的指标之一。
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Juniper Ericsson GGSN-U Services PIC J20 P-GGSN-U
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Juniper PB-1CHOC12SMIR-QPP 1-Port Channelized OC-12
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