5、在梯形图中没有真实的电流流动，为了便于分析PLC的周期扫描原理和逻辑上的因果关系，假定在梯形图中有“电流”流动，这个“电流”只能在梯形图中单方向流动——即从左向右流动，层次的改变只能从上向下。
PLC系统应确保企业系统未来的扩展，支持中国制造2025的宏伟蓝图。PLC应有助于实现更快的系统能以及更出色的处理能力、生产率和安全，从而满足智能制造机器和设备市场不断增长的需求。PLC能与配套的编程软件将和生产过程紧密联系起来，实现企业的智能制造。
一、PLC应具有的特和优势：
更高的处理能力；
的运行稳定可靠；
强大的网络通信能力，能完成多系统间以及控制级与设备、上级管理层大数据通信需求；
具有更强的鲁棒，适应更加苛刻的运行环境要求；
具有更快的（如千兆Gb）以太网，实现高速现场设备的轮询和数据管理；
控制器功能经过优化，大程度地提高系统能；
提供更强的诊断与故障处理能力，更强的安全，更丰富的功能；
二、PLC能从多方面增强控制系统：
智能
提供更强的诊断和故障处理功能；
基于以太网集成运动控制，轴数可达128-256；
集成以太网处理能力，实现高能的通信；
通过更好的通信能力，支持对现场设备大数据的采集和处理需求；
提供可选非易失存储器，可将用户程序和标签数据存储在控制器中；
用先进的技术取代数据备份所必需的电池或储能模块等易损耗器件；
配套软件的编程和组态环境可简化系统开发和调试。
提供额外的物理安全防护；
固件采用数字签名并进行加密，有助于防范企图；
可对尝试访问系统的进行身份验证，实现集中式身份验证和访问控制。
三、PLC应支持中国制造2025提出的3降（产品研制周期、运营成本和产品不良品率）2升（产品产量合格率和生产效率）战略
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