Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, Firmware rev. 3.0 or LATER User Manual
Page 183
Publication 1404-UM001F-EN-P - November 2009
183
Advanced Features Chapter 8
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Capture clear status: Read-only bitfield that indicates which
capture numbers are clear. Bit 0 (LSB) corresponds to capture 1,
bit 1 to capture 2 and so on. For each bit, 1 indicates clear, 0
indicates not clear.
•
Capture ready status: read-only bitfield that indicates which
capture numbers contain captures that are ready to read. Same
bit correspondence as above. For each bit, 1 indicates the
capture is ready, 0 indicates no capture or not yet ready.
Block Number
The block number and the total number of data reads required to read
an entire capture depend on the communication option. The range is
1…70 for the DeviceNet network and 1…28 for all other
communication options.
Read-back Mode
The data client uses the indexed read method to read transient
capture data. The Read-back mode options include the following:
•
Auto-increment all channels: successive reads of
Capture Clear/Read-back Data Select
table 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.
•
Manual increment: each write of the
table specifies the channel and
block to be read in the next read of the
table. Successive reads of the results table return the
same block of data each time if no read-back select write is
done.
As with other indexed reads, DeviceNet and Ethernet optional
communication support only manual increment read-back mode so
that the client must write a read-back select message before each read
of the results table. For all other communication options,
auto-increment all channels or auto-increment current channel
read-back mode provides the highest communication throughput.