PLC编程规范性3

<p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; vertical-align: inherit; box-sizing: border-box !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; color: rgb(255, 255, 255); background-color: rgb(84, 170, 48);"><strong style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; font-size: 15px; font-family: Helvetica, Arial, sans-serif;">3、 正确性</span></strong></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; vertical-align: inherit; box-sizing: border-box !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; color: rgb(63, 63, 63); font-size: 15px; font-family: Helvetica, Arial, sans-serif;">PLC的程序一定要正确，并要经过实际工作验证，证明其能够正确工作。这是对PLC程序的最根本的要求，若这一点做不到，其它的再好也没有用。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; vertical-align: inherit; box-sizing: border-box !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; color: rgb(63, 63, 63); font-size: 15px; font-family: Helvetica, Arial, sans-serif;">要使程序正确，一定要准确的使用指令，正确的使用内部器件。准确的使用指令与准确理解指令相联系，为此对指令含义和使用条件一定要弄清楚。必要时，可编些小程序对一些不清楚的指令作些测试。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; vertical-align: inherit; box-sizing: border-box !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; color: rgb(63, 63, 63); font-size: 15px; font-family: Helvetica, Arial, sans-serif;">同一指令，由于PLC的出厂批次不同或是PLC的系列型号的不同，一些指令细节有可能不一样，应仔细查阅编程手册。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; vertical-align: inherit; box-sizing: border-box !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; color: rgb(63, 63, 63); font-size: 15px; font-family: Helvetica, Arial, sans-serif;">内部器件正确使用也是重要的。如有的PLC有掉电保护，有的PLC没有。一定要做到该掉电保护的一定要用掉电保护的器件，反之则不能用。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; vertical-align: inherit; box-sizing: border-box !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; color: rgb(63, 63, 63); font-size: 15px; font-family: Helvetica, Arial, sans-serif;">总之，要准确的使用指令，正确使用内部器件，使所编的程序能正确要作，这是对PLC程序最根本的要求。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; vertical-align: inherit; box-sizing: border-box !important; overflow-wrap: break-word !important;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important; color: rgb(63, 63, 63); font-size: 15px; font-family: Helvetica, Arial, sans-serif;">举个简单的例子，上升沿和下降沿需要使用带存储功能的变量作为中间变量，比如M点或者DB点，如果使用FC的temp变量就会出问题的。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; vertical-align: inherit; box-sizing: border-box !important; overflow-wrap: break-word !important;"><br/></p><p><br/></p>