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US 2005/0043824 A1Published application
Programmable logic controller with an auxiliary processing unit
AssigneeDelta Electronics, Inc.
InventorHung-Chih Wu
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Abstract
A programmable logic controller (PLC) with an auxiliary processing unit is disclosed. The conventional PLC with one central processing unit has the problems of low execution speed, low counting frequency, and low output clock. The auxiliary processing unit is used to assist the operation of the original central processing unit. Besides, when connecting with another PLC through an expansion interface module, the disclosed PLC also has better performance and efficiency than those of the conventional ones.
Claims11
A programmable logic controller (PLC), comprising:
- a first processing unit, which executes low-speed pulse outputs, low-speed counting, and first group commands;
- and
- a second processing unit, which takes an interrupt signal generated by the first processing unit to execute a corresponding high-speed pulse output, high-speed counting, and a second group command.
Dependencies are inferred from the claim text.