SEW 31C005-503-4-00

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描述

SEW 31C005-503-4-00

省时性（运行成本低）
程序简短可以节省程序运行时间，但简短与省时并不完全是一回事，因为运行程序时间虽与程序所拥有指令条数有关，而且还与所使用的是什么指令有关，PLC指令不同，执行的时间也不同，而且，有的指令在逻辑条件ON时执行与在OFF时执行其时间也不同，另外，由于使用了流程控制指令，在程序中不是所有指令都要执行等。所以运行程序的时间计算是较复杂的，但要求其平均时间少，最大时间也不太长是必要的，这样可提高PLC的响应速度。省时的关键是用好流程控制指令，按情况确定一些必须执行的指令，作必备部分，其余的可依程序进行，有选择地执行，或作些分时工作的设计，避免最大时间太长等。
继承性（变动成本低）
要使程序具有继承性，那就是要便于修改和移植。PLC的特点之一就是方便，可灵活地适用于各种情况，其办法就是靠修改或重新设计程序，重新设计程序用于PLC工艺用途已经更改的情况，不仅程序重编，而且I/O也要重新分配，即便如此，很多独立功能的子程序依然可以适用于不同的工艺控制；对于相同或类似的工艺控制，多数情况下不需要重编程序，作一些修改就可以了。这就要求程序具有继承性，具有方便快捷的通用性接口，便于参数修改和程序的移植。

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Enlarge
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PLC模块，可编程控制器，CPU模块，IO模块，AI模块，通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家


选择深圳长欣，选择放心，售后无忧大量现货，当天顺丰发货！
主营：本特利，英维思，伍德沃德，福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐，ACSO，力士乐等各大品牌的DCS系统配件，机器人系统配件，大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”（不管能不能看懂，先了解个大概，以便学习编程时查找）；
2、由位控逻辑入手，逐渐增加定时、计数等条件，把或、与、非关系理顺；
3、进而练习整数运算、实数运算、类型转换；
4、量程转换、PID调节回路的建立及P、I、D参数的理解（最好是有个物理回路验证，比如变频器+电机+测速传感器）；
5、循环、顺序、跳转等程序控制（尽量避免跳转，非跳不可时也是跳的越近越好）；
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列，GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌，由于PLC的基本框架大同小异，学会一种至于其它的学习起来也就简单了。

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