Rockwell Automation 1395 ControlNet Communication Board - Manual (Page 52)

3–38 Configuration & PLC Interfacing
Publication 1395–5.37– March, 1999
Millisecond – An integer value representing the 10’s of milliseconds in
which the trigger condition was detected.
Monitored Parameter Descriptor – An integer value used by
Allen-Bradley program terminals to display the proper units for the
monitored parameter.
Block #1: This Block contains data samples 0 through 33 for the trend
buffer specified in the PMW instruction.
PMR Instruction Length: 38 words
MSG Size in Elements: 38
PLC Message Read
NOTE: Word 4 of the PLC Message Read instruction is broken down
into two bytes. The High byte contains the status bits
The Low byte contains the Drive message length in bytes.
0
Header
Word 1
0
Function Code
270
See Note
Header
Word 2
Header
Word 3
Header
Word 4
Data
Word 5
Data
Word 6
1
Data Sample
#1
Data
Word 7 Data Sample
#2
Data
Word x
–
Data Sample
#33 Data
Word 38
Data Samples – The data samples are
specified in Drive Units and may need
to be scaled by the PLC Controller prior
to being used in the program.