Systems and methods to control modbus redundancy

A system comprising:

• a programmable logic controller (PLC);
• a first communication module;
• a first interface module connected to the first communication module;
• a second communication module;
• and
• a second interface module connected to the second communication module,
• wherein the first and second communication modules are connected to the PLC through the first and second interface modules and through an industrial network.

A system for controlling equipment at a wellsite, the system comprising:

• a programmable logic controller (PLC);
• a first communication module comprising a primary master device;
• a first interface module directly connected to the first communication module;
• a second communication module comprising a standby master device;
• a second interface module directly connected to the second communication module, wherein the first and second communication modules are connected to the PLC through the first and second interface modules and through an industrial network;
• and
• a plurality of slave devices,
• wherein the primary master device of the first communication module is configured to communicate with each of the plurality of slave devices, and
• wherein the PLC is configured to determine that the primary master device of the first communication module is in a failure state, and in response, the PLC is configured to switch the primary master device of the first communication module to the standby master device of the second communication module such that the standby master device of the second communication module is configured to communicate with each of the plurality of slave devices.

A method to facilitate communication in a network comprising:

• a primary master device;
• a first interface module connected to the primary master device;
• a standby master device;
• a second interface module connected to the standby master device;
• a plurality of slave devices;
• and a programmable logic controller (PLC), wherein the primary master device is configured to communicate with each slave device of the plurality of slave devices, the method comprising:
• monitoring a health status of the primary master device;
• monitoring a communication status between the primary master device and each slave device of the plurality of slave devices;
• detecting a failure state in at least one of:
• the primary master device;
• and the communication status between the primary master device and each slave device of the plurality of slave devices;
• and
• switching from the primary master device to the standby master device such that the standby master device communicates with each slave device of the plurality of slave devices.