The EtherNet/IP (EIP) interface on the DeltaV PK controller allows communication to/from EIP data sources such as PLCs, variable-speed drives, motor control centers (MCCs), analyzers, sub-sea devices, and similar devices communicating EIP. The EIP interface is an EIP I/O scanner reading and writing data from/to EIP I/O adapters and other scanners. Typical ring, star, and linear topologies are supported with the EIP interface network.
The logical devices and signals defined under the EIP devices include the information needed to identify which data attribute within an instance (EIP data is grouped within instances of particular object classes) is to be accessed. Implicit I/O data transfers are used with a cyclic trigger to read I/O data.
Inputs and outputs are cyclic based on the configured Requested Packet Interval (RPI), ranging from 50 msec to 2 seconds.
Redundant PK nodes can impact your configuration planning.
Switchover time is the time it takes for control of devices to pass from one PK to the other in a redundant pair. Switchover time depends on the communication protocol, the number of connected devices (PDTs in the DeltaV hierarchy), and the number of LDTs and signals configured for the connected devices.
When the PK is using either of the supported EtherNet/IP protocols for control, devices must be configured to delay going into fail-safe state after detecting a communication loss. The delay time must be greater than the switchover time for the PK. Otherwise, devices will go into the fail-safe state whenever control passes from one PK to the other in the redundant pair.