Apparatus and methods for communicatively coupling field devices to controllers in a process control system using a distributed marshaling architecture

A distributed marshaling module for coupling field devices in a process plant to a controller in the process plant, comprising:

• a pair of communication ports;
• a first number of electronic marshaling component slots;
• a second number, equal to the first number, of terminal blocks, each terminal block in communicative connection with one of the electronic marshaling component slots and configured to be communicatively connected to a respective one of the field devices;
• a third number, less than or equal to the first number, of electronic marshaling components disposed in the electronic marshaling component slots, each of the electronic marshaling components configured to receive a signal from the respective one of the field devices and to convert the received signal to a format compatible with an I/O card;
• and
• a microprocessor coupled to the pair of communication ports, the microprocessor communicating with each of the electronic marshaling components and configured to transmit and receive data, via the pair of communication ports, for the electronic marshaling components.