158
SI-Ethernet User Guide
Issue: 3
7.5
EtherNet/IP
The Ethernet interface supports the EtherNet/IP protocol and conforms to the EtherNet/IP
adaptation of the Common Industrial Protocol (CIP) Specification. This is the same upper-layer
protocol and object model as used in DeviceNet.
The Ethernet interface module will operate as a slave device and the following functionality is
supported:
•
Variable length input assembly object (instance 100) with consistency for up to 32
parameters
•
Variable length output assembly object (instance 101) with consistency for up to 32
parameters
•
User selectable RPI timeout action
•
Identity object (class 0x01)
•
Motor data object (class 0x28)
•
Control supervisor object (class 0x29)
•
AC/DC Drive object (class 0x2A)
•
Control Techniques objects (classes 0x64 to 0x69)
•
Explicit (non-cyclic) access to parameters
7.5.1
Requested Packet Interval (RPI) timeout
This timeout is defined by the EtherNet/IP protocol and is configured in the PLC master. If enabled,
the Ethernet interface will monitor the data traffic once the cyclic data has been established, and if
data is not received within the specified time, it will perform the requested action as defined by Pr
S.20.011
RPI timeout action
. This indicates that the interface has detected that the cyclic data
communication has been interrupted.
7.5.2
Read consistency
Under normal conditions, cyclic data is sampled and transmitted at the Requested Packet Interval
(RPI). However, if an option module was in the process of modifying the mapped parameters while
these parameters were being sampled, then the data transmitted across the network may not be
consistent across the entire assembly object. If read consistency is enabled (
S.20.026
In
Consistency Enable
) and a trigger parameter specified in
In Consistency Trigger Param
(
S.20.027
)
then data will only be sampled and transmitted when the trigger parameter
In Consistency Trigger
Param
(
S.20.027
) contains a non-zero value. This trigger parameter will then be set to zero after
the data has been sampled.
It is therefore possible, by controlling the trigger parameters, that a user program in the drive or
option module can ensure that the values in the cyclic data parameters are not sampled until all
values are updated.
Whether consistency is enabled or not, data will always be consistent for an individual parameter,
i.e. all 4 bytes of a 32-bit value will be consistent.
The RPI timeout action will only occur on a loss of cyclic data message, i.e. after cyclic
data has been established and subsequently lost. No action will be taken if no cyclic data
has been detected.
NOTE
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