Method and apparatus for communication between analytic modules and a motor drive

A system for communication between a motor drive and at least one electronic device, wherein the motor drive is operative to control a motor in an industrial control system, the system comprising:

• a first Ethernet communication interface in the motor drive, the first Ethernet communication interface configured to receive a first end of a single-pair Ethernet cable;
• a first clock circuit in the motor drive, wherein a first update period in the motor drive executes as a function of the first clock circuit;
• and
• an analytic module further comprising:
• a second Ethernet communication interface, the second Ethernet communication interface configured to receive a second end of the single-pair Ethernet cable, wherein power is provided to the analytic module from the motor drive via the single-pair Ethernet cable,
• a second clock circuit in the analytic module, wherein the motor drive is configured to transmit a synchronization command to synchronize the second clock circuit to the first clock circuit and the analytic module sets a second update period equal in duration to the first update period in the motor drive;
• at least one input interface configured to receive a feedback signal from the at least one electronic device, wherein:
• the feedback signal corresponds to an operating state in the industrial control system,
• the feedback signal received from the at least one electronic device is sampled by the analytic module at a common time during each second update period,
• the at least one input interface converts the feedback signal to a digital value, and
• a processor configured to:
• receive the digital value of the feedback signal from the at least one input interface,
• insert the digital value of the feedback signal in a data packet, and
• transmit the data packet to the motor drive via the single-pair Ethernet cable in real-time.