Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 389
CIP Objects Appendix A
Availability of Dynamic Data
Immediately after power cycle or configuration download, dynamic data takes
some time to become available as internal sample buffers must be populated
based on the new time configuration.
In most cases, the delay can be a few seconds. However, for configurations with
low sample rates, the delay could be several minutes.
Object Specific Services
A data communication session starts at the first service request and ends after
the final response of the exchange. However, the session is subjected to an
(inactivity) timeout of 30 seconds.
Table 117 - Object Specific Services
Service
Code
Implementation Service Name Description of Service
Class Instance
0x4B x x Alarm Buffer
Trigger
Force the alarm data to be saved as if an alarm has
occurred. This save is intended to be used when an
alarm or event external to the DMx-M has occurred.
0x4C - x CM Record
Request
(1)
(1) Data types that consist of multiple bytes are transferred in little-endian format (least significant byte first).
Specify the Record Request parameters (defined in the
following section). Since the records can be large and
the request can be for many records, the Record
Request usually has to be sent multiple times.
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