Intrinsically safe field instruments are isolated with MTL ATEX barriers. For HART transmitters MTL backplanes are provided with HART multiplexers connected to third party Asset Management System. Transmitters and actuators for closed control loops are connected to redundant I/O cards. Redundant Ethernet LAN (control network) connect PLC and HMI. Third party Motor Control Center (MCC) is equipped with local controller connected to the control network. Interface between supplied control system and MCC local controller is implemented with ModBus TCP protocol. Communication with plant DCS is implemented with ModBus TCP over redunant Ethernet LAN separated from control network.