Programmable logic controller (PLC) with an additional memory

Abstract

It is a programmable logic controller with append memory which is to use data bus to connect a append memory and to store a direction order in the memory of the programmable logic controller body. When it reads this section direction order, it will self direct to the address of the append memory and execute its inner stored append program codes. In the situation without changing its inner memory, it can effectively provide a order expansion of the programmable logic controller.

Description

technical field [0001] The invention relates to a programmable logic controller used in automation equipment, especially a programmable logic controller with an additional memory and additional instructions can be added. Background technique [0002] Programmable logic controller (programmable logic controller, PLC) is a powerful tool for process control. Today, most of the work of factory program automation is performed by programmable logic controllers. It is basically like a system specially designed for process control. The user writes the program into the storage module through the computer software, writer and human-machine interface provided by the manufacturer, and then the central processing unit of the programmable logic controller follows the control logic (controllogic) defined in the program to monitor It also processes input signals from devices such as buttons, sensors or limit switches, and sends output signals to external loads after logical judgment, such a...

AI Technical Summary

Problems solved by technology

However, because the instruction program codes are all burned in the memory, the user cannot change it. Once some instructions are found to be incomplete or inapplicable, the entire PLC can only be sent back to the original factory to replace the memory; this method is quite inconvenient, and the number of program instruction codes is also limited to the size of the memory capacity, which cannot be increased

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