Rockwell Automation 44887-PUB, 44887 Enwatch - Manual (Page 36)

Publication GMSI10-UM031C-EN-E - January 2009
32 Installing the Enwatch
Limitation on number of points in Enwatch
The Enwatch unit has 640 K bytes memory for data storage. If you attempt to
collect data on more points than can fit in memory, the unit returns an error
message. The message appears in the Unload Station Manager window (refer
to the Online Applications Guide for more on the Unload Station Manager). The
Enwatch driver can combine measurements in some cases (see “Combining
measurements in the Enwatch driver” on page 21).
If a route has 5 points per channel and 400 lines, 4 averages, no overlap
averaging:
Bytes required: 5 points x 16 channels x 1024 bin x 2 byte/bin x 4 averages =
655360 bytes
If a route has 2 points per channel and 800 lines, 4 averages, no overlap
averaging:
Bytes required: 2 points x 16 channels x 2048 bin x 2 byte/bin x 4 averages =
524288 bytes
To best use the 640K memory, try to use overlap averaging. For examples, see
“Maximum number of averages that can be supported” on page 24.
Configuration of Emonitor
with Enwatch The Enwatch unit is specially designed to operate over an Ethernet
connection. Each Enwatch unit has a unique IP address that can be changed
through the RS232 port inside the unit. Ideally, one Enwatch unload station
can serve an unlimited number of Enwatch units. However, to improve unload
speed, multiple Enwatch unload stations are suggested.
Each Enwatch unit has 16 vibration channels and 4 tachometer channels. In
addition, the Allen Bradley Enlive software (live mode analysis) can be used to
“lock onto” one channel at a time. During live mode analysis, regularly
scheduled unload continues to unload whatever data is in the Enwatch unit
buffers before entering live mode analysis. The Enlive software has a default
timeout of 30 minutes to prevent an extended break in unloading scheduled
data.
For more information on setting up an Enwatch unit in an Emonitor system,
refer to the Online Applications Guide provided with your Emonitor online
system.