PROGRAMMABLE UNIVERSAL INPUT I/O FOR MULTI-CHANNEL I/O PACK
Publication Date: 2014-Jul-21
The IP.com Prior Art Database
The need to carry dedicated I/O PACKS to support different types of I/O types is circumvented by an innovative design of Universal I/O which allows different I/O types to be used with a single I/O pack. The invention is based on the features of a single chip analog front end (AFE) ICs from Texas Instruments (TI) and Analog Devices (AD). These two chips have all the building blocks necessary to support a universal input I/O. The universal input I/O allows the same hardware to be able to process input I/Os such as, but not restricted to, Analog current input (4-20ma input), Analog Voltage input (+/-5V, +/-10V), Thermocouple input, RTD input, Contact Input. The innovation eliminates the need to have dedicated I/O PACKS thus reducing the burden of carrying different devices in stock and also reducing manufacturing costs of the I/O PACKS.
Data acquisition system (DAS) and Control Systems are continuously online and read input data directly from different sources that need monitoring in an industrial application. A Data acquisition system may consist of a sensor, signal filters to preserve the signals from the sensor, a digital to analog converter, a processor to process the converted signals and a controller. Examples of sensors for industrial applications are Thermo-couple, RTD, Contact input etc. The DAS and Control Systems are also referred to as I/O PACKS. Currently, the DAS and Control Systems are available to process a specific type of input signal, either analog or discreet. There are combo PACKS that cater to a fixed number for a select I/O type. The manufacturer has to manufacture and maintain I/O PACKS that cater to different dedicated I/O types. The cost of manufacturing I/O PACKS for dedicated I/O can grow substantially due to dedicated I/O PACK requirement for each I/O type. Further, current designs provide fault-tolerance to enable un-interrupted monitoring of data which means multiple components are designed in a fault-tolerant way to provide almost 100% availability of the monitoring system. Considering the dedicated I/O PACKS and fault-tolerance, the manufacturing cost and the inventory carrying cost is huge for the manufacturer. Some designs work around the problem by using general purpose I/O for both turbine applications and process control. Turbine-specific I/O is used for direct interface to the unique sensors and actuators on turbines. This reduces or eliminates some amount of interposing instrumentation. However, the manufacturer may be able to reduce the costs with improved product design which can cater to processing of multiple I/O types.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 illustrates the block diagram of the Universal I/O with different signal filtering mechanisms.
FIG. 2 illustrates the block diagram of the Universal I/O with only one of the three signal filtering mechanisms.
FIG. 3a illustrates the functional block diagram of the chip LMP90100 from Texas Instruments.
FIG. 3b: illustrates the functional block diagram of the chip ADuCM360 from Analog Devices.
FIG. 4a illustrates the block schematic of 8/ 16 channel Universal Input based on the LMP90100 AFE.
Fig. 4b illustrates the block schematic of 8/ 16 channel Universal Input based on the ADuCM360 AFE.
The invention is designed taking into account the advanced features provided by two chip manufacturers, Texas Instruments and Analog Devices. The invention works with the single chip analog front end (AFE) integrated circuit from Texas Instruments and Analog Devices. Two of such AFE integrated circuits are the LMP90100 from Texas Instruments and the other is ADUCM360 from Analog Devices which have all the building blocks necessary to support a universal I/O. The Analog Devices integrated circuit ADUCM360...