
390
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Appendix A
CIP Objects
0x4C CM Record Request
CM data is retrieved using a series of request/response unconnected messages.
One service is used to both start and continue with a session. The first request
initiates the session and subsequent requests return values that the service
returns. When the packet count down value that is returned reaches 0, the
session is completed.
The instance and attribute can be set to 1, but they are ignored.
The host sends the following CM Record Request Parameters as part of an
0x4C service request.
Table 118 - CM Record Request Parameters
Byte Offset Within
Structure
Structure Member
Data Type
Description
0
BufferSelect
INT
Specify the buffer to retrieve the data from:
• eHIGH_RES_TREND (0)
• eLOW_RES_TREND (1)
• eFFT (2)
• eTWF (3)
• eTACHO (4)
• eHIGH_RES_ALARM (5)
• eLOW_RES_ALARM (6)
• eFFT_ALARM (7)
• eTWF_ALARM (8)
• eTACHO_ALARM (9)
The BufferSelect does not change during a session.
2
RequestedCount
UINT
RequestedCount = 0 returns all records in the buffer.
RequestedCount = 1 returns the most recently collected record.
Any other positive count returns that number of records from the buffer. If the count is greater
than the max available records, the max available records are returned instead.
The RequestedCount does not change during a session.
4
SessionInstance
USINT
The SessionInstance is initially specified as 0, but on subsequent calls the SessionInstance
returned in CM Record Response must be passed here.
5
ChannelSelect
BYTE
4 Bits indicating the source channel. The ChannelSelect does not change during a session (see
Channel Select).
This field is ignored for all overall buffer types (eHIGH_RES_TREND,
eLOW_RES_TREND, eHIGH_RES_ALARM, eLOW_RES_ALARM)
6
SpecialRequest
BYTE
See
.
7
Pad
BYTE
Used to align data to a 32-bit boundary.
8
PacketCountDown
DWORD
The PacketCountDown is initially specified as 0, but on subsequent calls the PacketCountDown
returned in the CM Record Response must be passed here.
Содержание 1444-AOFX00-04RB
Страница 10: ...10 Rockwell Automation Publication 1444 UM001D EN P June 2018 Table of Contents Notes...
Страница 12: ...12 Rockwell Automation Publication 1444 UM001D EN P June 2018 Preface Notes...
Страница 198: ...198 Rockwell Automation Publication 1444 UM001D EN P June 2018 Chapter 5 Configure the Tachometer Expansion Module Notes...
Страница 210: ...210 Rockwell Automation Publication 1444 UM001D EN P June 2018 Chapter 7 Configure Relays Notes...
Страница 230: ...230 Rockwell Automation Publication 1444 UM001D EN P June 2018 Chapter 8 Configure Alarms Notes...
Страница 240: ...240 Rockwell Automation Publication 1444 UM001D EN P June 2018 Chapter 9 Trend and Transient Capture Notes...
Страница 316: ...316 Rockwell Automation Publication 1444 UM001D EN P June 2018 Chapter 10 Operate the Module Notes...
Страница 549: ......