CPU固件CPU固件包含有对PLC的基本操作指令，该固件是由GE Fanuc工程产品部开发的，它存储在EPROM或FLASH中，挂靠在CPU上.CPU固件更新随着时间的推移，新的固件被不断推出，同老版本比较一个新版本的固件会有新的特点和改进，

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