Bently Nevada 3300/01 Series, Operation Manual, Page: 41 / 78

System Monitor
1 1 6 PROTOCOL SPECIFICATIONS
80175-01
temperature for channel 1. Channels 2 through 6 follow at addresses 19 through 23. The
Allen Bradley command format will have the ADDR field set to 36 and the SIZE field set
to 12. See note 2 above.
Note
In all the examples, addresses are given in decimal. In programming Allen Bradley
devices conversion to octal may be necessary.
MONITOR STATUS
The monitor status indicators will be returned as 16-bit words with a value of 1 o r O. Each monitor
will have these three status words associated with it: Alert, Danger and not OK. Individual channel
status is not available. If any channel of a monitor is in alert, then the monitor status is Alert.
The monitor status words will be ordered Alert, Danger, not OK and occupy contiguous protocol
addresses starting a t w o r d address 4 8 ( 6 0 octal). T o r e a d t h e monitor statuses u s e t h e
Unprotected Read Command (command code 1).
A simple formula for computing the starting address for any monitor's status values is
Starting address = 4 8 + 3(number of monitors to left of the selected monitor, including empty
slots)
Use the Unprotected Read Command (command code 1) to access the monitor status values for
the rack.
Note
In all the examples, addresses are given in decimal. In programming Allen Bradley devices
conversion to octal may be necessary.
Example 1:
Read monitor status from a 3300 rack which has a vibration monitor in slot 1 a n d a 6-
channel temperature monitor in slot 3.
The unprotected read command should request 9 status words (18 bytes) starting at word
address 48. The status from the nonexistent monitor in slot 2 should be ignored by the
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