Method and device for providing service for a programmable logic controller

A method for obtaining service from a service provider, which is applied to a programmable logic controller comprising a virtual functional module, comprising:

• establishing a communication connection with a service provider;
• providing the service provider with a mapping relation between an input channel of the virtual functional module and an output of the service provider;
• and
• receiving an output variable from the output of the service provider through the input channel, and updating the value of the input channel with the output variable.

A method for providing a programmable logic controller with service, which is applied to a service provider, comprising:

• establishing a communication connection with a programmable logic controller comprising a virtual functional module;
• obtaining a mapping relation between an input channel of the virtual functional module and an output of the service provider, from the programmable logic controller;
• and
• transmitting an output variable to the input channel through the output of the service provider, thus the value of the input channel is updated with the output variable.

A device for obtaining service from a service provider, which is applied to a programmable logic controller comprising a virtual functional module, comprising:

• an establishing module, configured to establish a communication connection with a service provider;
• a providing module, configured to provide the service provider with a mapping relation between an input channel of a virtual functional module and an output of the service provider;
• and
• a receiving module, configured to receive an output variable from the output of the service provider through the input channel, and to update the value of the input channel with the output variable.

A device for providing a programmable logic controller with service, which is applied to a service provider, comprising:

• an establishing module, configured to establish a communication connection with a programmable logic controller comprising a virtual functional module;
• an obtaining module, configured to obtain a mapping relation between an input channel of the virtual functional module and an output of the service provider, from the programmable logic controller;
• and
• a transmitting module, configured to transmit an output variable to the input channel through the output of the service provider, thus the value of the input channel is updated with the output variable.