Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, PRIOR to Firmware rev. 3.0 User Manual

Page 153

Publication 1404-UM001D-EN-E - October 2004

Advanced Features 8-3

Block Number

The block number and the total number of data reads required to read
an entire capture depend on the communications option and the
capture type. See Table 8.1. The block number range is 1 to the
number of Data reads required listed in the table.

Capture Type

The properties associated with the capture type options are listed in
Table 8.1. You may select a capture type that best suits your
application requirements. A higher sample rate provides a more
accurate representation of the waveform when higher-order
harmonics and transients are present. Higher data resolution provides
more accuracy of each data point. Capture type 5 combines low
sampling rate and low resolution, but captures almost 7 seconds of
waveform at 60 Hz.

Read-Back Mode

The data client uses the indexed read method to read oscillogram
capture data. The readback mode options are:

• Auto-increment all channels: successive reads of Table A.40

increment through all remaining blocks of the current channel,
increment through all remaining channels and wrap back to the
original channel.

• Auto-increment current channel: successive reads of the results

table will increment through all remaining blocks of the current
channel only.

Table 8.1 Capture Type Properties

Capture
Type

Sampling
Rate

Data
Resolution

Samples per
Cycle at 60 / 50
Hz

Total Cycles per
Channel at 60 / 50
Hz

Capture
Duration
(seconds)

Data Reads Required

DeviceNet

Other Comms

5.4 kHz

13-bit
w/sign

90 / 108

51.1 / 42.6

0.85

230

2.7 kHz

45 / 54

102.2 / 85.2

1.70

1.35 kHz

22.5 / 27

204.4 / 170.3

3.40