Measurement transmitter for a multisensor system, especially as field device for process automation technology, and method for operating the measurement transmitter
A measurement transmitter for a multisensor system for process automation technology, wherein the measurement transmitter, for processing in- and output signals, has a processor, which is connected with an interface, to which a sensor is connected for transmission of data via a transmission line. In communication between the processor and the interface, or the sensor and the interface, different transmission rates of data occur. In order to be able to connect to the measurement transmitter a plurality of sensors working with different principles of operation, and, in spite of the plurality of sensors, largely avoid errors in the data transmission, at least two sensors are present, wherein a function module is present in the interface for each sensor and the function module for each sensor is connected with such sensor via a dedicated transmission line.
1. A measurement transmitter for processing input and output signals for a multisensor system, comprising:
a processor;
at least two sensors, each sensor embodied to measure at least one physical quantity and to communicate digitally bi-directionally;
a partially dynamically reconfigurable logic chip including a central I/O controller;
at least two function modules, wherein each function module is disposed in the partially dynamically reconfigurable logic chip and wherein each function module corresponds to a sensor;
a flash memory configured to store a configuration bitstream configured to program the partially dynamically reconfigurable logic chip;
at least two transmission lines, wherein each sensor is connected to its respective function module via a transmission line for the transmission of data; and
at least two expansion blocks, wherein each expansion block is connected to the processor via a bus system and connected to the partially dynamically reconfigurable logic chip and wherein each expansion block has an identification unit for identification of the expansion block,
wherein the processor is configured to read the configuration bitstream from the flash memory and to program the partially dynamically reconfigurable logic chip with the configuration bitstream,
wherein the processor is further configured to read the identification from the respective expansion block and program the partially dynamically reconfigurable logic chip with a function module for the respective expansion block via the configuration bitstream,
wherein the processor is further configured to connect each expansion block with its respective function module in the partially dynamically reconfigurable logic chip, and
wherein the processor is further configured to detect a removal of the expansion block and to remove from the partially dynamically reconfigurable logic chip the function module for the respective expansion block,
wherein the central I/O controller is configured to enable communication between the processor and the central I/O controller at a different communication rate than between the central I/O controller and each sensor, and
wherein the function module for each sensor is configured freely programmable in the partially dynamically reconfigurable logic chip via the configuration bitstream.
2. The measurement transmitter as claimed in claim 1 , wherein the central I/O controller is configured to enable communication between any sensor and its corresponding function module at a communication rate different from any other sensor and its function module.
3. The measurement transmitter as claimed in claim 1 , wherein:
the configuration of the function modules occurs via the configuration bitstream that is loaded into said partially dynamically reconfigurable logic chip.
4. The measurement transmitter as claimed in claim 1 , wherein:
one of the at least two expansion blocks includes a seat for an SD memory card via which software of said processor and/or hardware of said logic unit is updated.
5. The measurement transmitter as claimed in claim 1 , wherein:
one of the at least two expansion blocks serves for operating a display and/or service unit.
6. The measurement transmitter as claimed in claim 1 , wherein:
one of the at least two expansion blocks serves for control of a sample taker.
7. The measurement transmitter as claimed in claim 1 , wherein:
one of the at least two expansion blocks serves for control of an analyzer.
8. The measurement transmitter as claimed in claim 1 , wherein input circuitry of the sensors are provided in the at least two expansion blocks.