Serial access memory cartridge for programmable logic controller
AssigneeSiemens Energy & Automation, Inc.
InventorsAlan D. McNutt, Steven M. Hausman
Life of this patent
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Abstract
A serial access, electrically erasable, programmable read-only memory (EEPROM) is used to store user program and data and is disposed in a memory cartridge. The memory cartridge cooperates a base or master Programmable Logic Controller (PLC) and may be used to download a program into one or more master PLC's, or to upload a program from a master PLC to memory cartridge. Each PLC may include at least one input terminal and at least one output terminal for receiving and transmitting signals, at least one microprocessor, at least one memory device, and a connector for accessing the at least one memory device.
Claims4
A serial access memory cartridge for use with a Programmable Logic Controller (PLC) having a first connector with at least one input terminal and a second connector with at least one output terminal for transmitting and receiving respectively predetermined signals, at least one microprocessor for executing a user specified plurality of calculations and commands, at least one memory device interconnected to and cooperable with the at least one microprocessor for storing the user specified plurality of calculations and commands, the PLC having a third connector for access to the first memory device in cooperation with said at least one microprocessor, the serial access memory cartridge comprising:
- a serial access memory device cooperable with said third connector and having user specified information storable therein, wherein:
- said user specified information contained in said at least one memory device may be transferred by serial communications means and stored in said serial access memory device and,
- said user specified information contained in said serial access memory device may be transferred by said serial communications means and stored in said at least one memory device.
Dependencies are inferred from the claim text.