Process Installation Comprising a Plurality of Field Appliances
In a process installation having a plurality of field devices FLS, PS, CU, which exchange data with a control room CR via a signal line SL, wherein the signal line SL is designed for a conventional, first data transmission technology having a low data transmission rate (less than 10,000 baud), at least one field device CU applies for data transmission with the control room CR, via a second data transmission technology, which permits a greater data transmission rate and/or more functionality than the first transmission technology and which uses the existing signal line SL as the communication medium.
1 - 10 . (canceled)
11 . A process installation having:
a control room;
a signal line;
a plurality of field devices, which exchange data with said control room via said signal line SL, wherein:
said signal line SL is designed for a conventional first data transmission technology having a low data transmission rate (smaller than 10,000 baud);
at least one field device, for data exchange, operates with a second data transmission technology, which permits a greater data transmission rate and/or an expanded functionality than the first transmission technology, and which uses, as a communication medium, the existing signal line SL.
12 . The process installation as claimed in claim 11 , wherein:
the first and second data transmission technologies use separate data transmission channels occupying different frequency bands.
13 . The process installation as claimed in claim 11 , wherein:
the first data transmission channel occupies a frequency band up to 4 kHz, and the second data transmission channel occupies a frequency range greater than 4 kHz.
14 . The process installation as claimed in claim 11 , wherein:
said signal line SL is a 2-wire line.
15 . The process installation as claimed in claim 11 , wherein:
said signal line SL is a copper 2-wire line with a bandwidth of about 1 MHz.
16 . The process installation as claimed in claim 11 , wherein:
said first data transmission technology operates according to an industrial standard, e.g. Whessoematic WM550, Varec Mark/Space, Sakura V1, Tiway, Profibus, HART, FF.
17 . The process installation as claimed in claim 11 , wherein:
said second data transmission technology corresponds to DSL (digital subscriber line) technology.
18 . The process installation as claimed in claim 11 , wherein:
the process installation, is a tank farm with a plurality of tanks LC 1 , LC 2 , LC 3 , LC 4 , LC 5 for containing liquid.
19 . A method for modernizing a process installation with a plurality of field devices, which exchange data with a control room CR via a signal line SL, comprising the step of:
older field devices which transmit data to a control room according to a first transmission technology by new field devices, which work according to a second transmission technology, wherein:
the data transmission according to the second transmission technology occurs in a second channel on the existing signal line SL, so that the data transmission signals of the different transmission technologies do not influence one another.
20 . A method for communication in a process installation with a plurality of field devices, comprising the step of:
using an existing signal line SL for a first transmission technology and also for a second transmission technology.