Emerson Fisher 4320 Instruction Manual page 25

4320 Position Monitor
October 2012
Figure 19. Temperature Effects on Power Module
Life; On/Off Control and Monitoring
12
10
8
6
4
2
0
-40 -15 10
TEMPERATURE (_C)
NOTE: THREE SUB-DEVICES ARE
ASSUMED WITH 60 SECOND UPDATE RATE.
ON/OFF CONTROL; 100 ACTUATIONS PER DAY.
Continuous updates is the default communication method for the selected device variable; the device sends the data
to the gateway at every update period, whether the data has changed or not. However, the 4320 can also be
configured to allow position feedback sampling at faster than the default update rate and to send data only when the
measured variable has changed. This is useful in certain applications; for example, when used with relief valve
monitoring. When using the standard and extended life battery sourced power modules, sample rates can be set to as
fast as 0.5 second sampling.
Note
Faster than publish rate sampling can only be configured when at least one of the three burst messages is being triggered.
Refer to Advanced Wireless Reporting (Report By Exception and Delayed Trigger Reporting) on page 34 for additional
information on faster sampling.
Consult the Emerson Smart Wireless Gateway information for details on network size, available at
http://www2.emersonprocess.com/en-US/brands/rosemount/Wireless/Wireless-Gateway/Pages/index.aspx
24
35 60 85
ON/OFF CONTROL
STANDARD
EXTENDED
MONITORING
STANDARD
EXTENDED
Figure 20. Effect of Actuations on Power Module Life;
On/Off Control
12
10
8
6
4
2
0
1 10
NUMBER OF ACTUATIONS PER DAY
NOTE: THREE SUB-DEVICES ARE ASSUMED,
60 SECOND UPDATE RATE, CONSTANT
TEMPERATURE OF 22_C (72_F).
Instruction Manual
D103621X012
100 1000 10000
STANDARD
EXTENDED