Instruction Manual
D103621X012
4320
January 2018
23
Figure 16. Update Rate Impact on Power Module
Life; On/Off Control and Monitoring
POWER
MODULE LIFE (YEARS)
UPDATE RATE (SECONDS)
STANDARD
EXTENDED
NOTE: THREE SUB-DEVICES ARE ASSUMED,
CONSTANT TEMPERATURE OF 22
_
C (72
_
F).
12
10
8
6
4
2
0
1
10
10000
100
1000
Figure 17. Number of Sub-Devices Impact on Power
Module Life; Monitoring
POWER
MODULE LIFE (YEARS)
NUMBER OF SUB-DEVICES
STANDARD
EXTENDED
12
10
8
6
4
2
0
5
10
15
NOTE: 60 SECOND UPDATE RATE, CONSTANT
TEMPERATURE OF 22
_
C (72
_
F).
16
0
Figure 18. Temperature Effects on Power Module
Life; On/Off Control and Monitoring
POWER
MODULE LIFE (YEARS)
TEMPERATURE (
_
C)
NOTE: THREE SUB-DEVICES ARE
ASSUMED WITH 60 SECOND UPDATE RATE.
ON/OFF CONTROL; 100 ACTUATIONS PER DAY.
STANDARD
EXTENDED
12
10
8
6
4
2
0
-40
-15
10
35
60
85
STANDARD
EXTENDED
MONITORING
ON/OFF CONTROL
Figure 19. Effect of Actuations on Power Module Life;
On/Off Control
NUMBER OF ACTUATIONS PER DAY
POWER MODULE LIFE (YEARS)
NOTE: THREE SUB-DEVICES ARE ASSUMED,
60 SECOND UPDATE RATE, CONSTANT
TEMPERATURE OF 22
_
C (72
_
F).
STANDARD
EXTENDED
12
10
8
6
4
2
0
1
10
100
1000
10000
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
