The Ethernet/IP interface supports the following types of messaging
connections:
- Implicit messages (Class 1)
- Explicit messages (Class 3)
- Class 3 with PCCC
- UCMM with Logix Tags
The Ethernet/IP interface supports the following types of data access
using the Ethernet/IP protocol:
- Input data:
- Class 1: Input data is read in block mode.
- Class 3: Input data is read in single mode. The configuration of
each signal defines the attribute ID of the single attribute that signal is to
access.
- PCCC over Class 3: Input data is read in block mode. The
configuration of the LDT points to a PCCC data table and specifies how many
parameters to access, mapping each parameter to a signal.
- Logix Tags over UCMM: Input data is read in block mode. The
configuration of the LDT points to a Logix tag and specifies how many
parameters to access, mapping each parameter to a Signal.
- Output data:
- Class 1: Output data is written in block mode.
- Class 3: Output data is written in single mode. The configuration
of each signal defines the attribute ID of the single attribute that signal is
to write to.
- PCCC over Class 3: Output data is written in block mode. The
configuration of the LDT points to a PCCC data table and specifies how many
parameters to write to, mapping each parameter to a signal.
All reads are performed periodically as defined by the configured
Requested Packet Interval (RPI) of the logical device. Outputs are sent at a
rate that is limited by the execution rate of the module writing the outputs.
Note that the module execution rate should not be faster than the RPI of the
output logical device. Ideally, the RPI of output logical devices would be
twice as fast as the execution rate of the writing module.