Communication Connections; Wireless Communication - Emerson TopWorx 4310 Instruction Manual

Instruction Manual
October 2009
UPDATE RATE AND NETWORK SIZE
100
75
50
25
0
60 30
UPDATE RATE (SECONDS)
Figure 10. Update Rate and Network Size
POWER MODULE LIFE VERSUS UPDATE RATE
14
12
10
8
6
4
2
0
60
50 40
UPDATED RATE (SECONDS)
NOTE: FOUR CHILDREN ARE ASSUMED WITH THE SAME UPDATE
RATE AND A CONSTANT TEMPERATURE OF 25_C (77_F).
Figure 11. Power Module Life Versus Update Rate

Communication Connections

A HART communicating device, such as a 475 or
375 Field Communicator, interfaces with the 4310
wireless position monitor. Convenient termination
points are located inside the front cover, as shown in
figure 22. The connection pins are not polarity
sensitive. The instrument must be powered before
digital communication will commence.
Wireless Communications
Devices in a WirelessHART network are time
synchronized and send their data to the gateway at
selectable update rates. The update rates of the
device have an effect on the number that the
8 4
30 20 10 0
STANDARD
EXTENDED
4310 Wireless Position Monitor
NUMBER OF CHILDREN
IMPACT ON ON POWER MODULE LIFE
16
14
12
10
8
6
4
2
0
8
7 6
NOTE: 60 SECOND UPDATE RATE, CONSTANT
TEMPERATURE OF 25_C (77_F).
Figure 12. Number of Children and Power Module Life
TEMPERATURE EFFECT ON POWER MODULE LIFE
14
12
10
8
6
4
2
0
80
60
NOTE: FOUR CHILDREN ARE ASSUMED WITH
60 SECOND UPDATE RATE, CONSTANT.
Figure 13. Temperature Effect on Power Module Life
gateway can service. For example, if each device
sent an update once per minute the gateway could
support 100 devices. Figure 10 shows the
correlation between the number of devices that can
be supported versus update rates.
Battery powered devices conserve energy by only
sensing and transmitting data at the selectable
update rate. The faster the update rate the the lower
the life span of a power module. Figures 11, 12, and
13 show the correlation between power module life
and update rate, the number of children, and
temperature, respectively.
5 4 3 1
2
NUMBER OF CHILDREN
−20
40 20 0
TEMPERATURE (_C)
0
STANDARD
EXTENDED
−40
STANDARD
EXTENDED
9