Anomaly detection method and system for process instrument, and storage medium

A programmable logic controller (PLC), comprising:

• a function module;
• a virtual function module, a mapping being set between at least one input channel of the virtual function module and an output of at least one anomaly diagnosis algorithm arranged on a service provision system, and upon the at least one input channel receiving an anomaly indication outputted by the service provision system, the virtual function module being configured to provide the anomaly indication to the function module as an input variable of the virtual function module, the input variable indicating an anomaly exists in a process instrument corresponding to the anomaly diagnosis algorithm mapped to the input channel;
• an analog quantity input/output module configured to
• receive measurement data of a process instrument, convert the measurement data from an analog quantity to a digital quantity and then provide the measurement data, converted from the analog quantity to the digital quantity, to the function module, and
• receive a first control instruction or second control instruction from the function module, convert the first control instruction or second control instruction from a digital quantity to an analog quantity, and then output the first control instruction or second control instruction, converted from the digital quantity to the analog quantity, to a process execution mechanism;
• a central processor module configured to cache and transfer the measurement data, wherein the function module, upon receiving the input variable, being configured to determine whether or not an anomaly exists in the corresponding process instrument and output a first control instruction to the analog quantity input/output module according to a preset default value upon determining that the anomaly exists and being configured t output a second control instruction to the analog quantity input/output module according to the measurement data, upon determining that the anomaly does not exist;
• and
• a power supply module, configured to supply power to the central processor module, the analog quantity input/output module and the function module.

A service provision system, comprising:

• at least one memory to store a computer program, a mapping being set between an output of at least one anomaly diagnosis algorithm arranged on the service provision system and at least one input channel, of each at least one virtual function module integrated on a programmable logic controller (PLC), each at least one anomaly diagnosis algorithm being used to diagnose whether an anomaly exists in a process instrument;
• and
• at least one processor to call the computer program stored in the at least one memory, and to execute at least sending of the measurement data of a process instrument to at least one virtual function module integrated on the PLC, the measurement data being received, periodically, and stored in a historical database;
• wherein the PLC determines, upon receiving an anomaly indication outputted by the service provision system, via at least one input channel of the at least one virtual function module, whether or not an anomaly exists in the process instrument corresponding to the at least one anomaly diagnosis algorithm respectively mapped to the at least one input channel, wherein the anomaly indication is outputted by the service provision system upon the service provision system determining that an anomaly exists in the process instrument, after acquiring the measurement data from the historical database and using the corresponding at least one anomaly diagnosis algorithm to diagnose the measurement data.