Maximum Total Field Bus Length (For Stt02 Transmitter Communication) - ABB Symphony Harmony Series Instructions Manual

Setup/Physical Installation
1 20 0
(4 00 0 )
90 0
(2 95 2 )
M A X IM U M
D IS TA N C E
60 0
M E T E R S (FE E T)
(1 96 8 )
30 0
(1 00 0 )
Figure 2-7. Maximum Total Field Bus Length (for STT02 Transmitter Communication)
Figure
star field bus with various lengths of wire on each point of the
star field bus. Figure
using two channel inputs. This configuration is a linear field
bus and star field bus using the same termination unit with
branches at various lengths. The total length of all buses does
not exceed the maximum allowable length.
3. Use 18 AWG wire or larger. The wire can be unshielded or
shielded.
4. The data on communication lengths for the Type STT02
Smart Transmitter Terminal (Fig. 2-7) applies when the STT02
terminal is connected to the termination unit and communi-
cating to a transmitter on the field bus. When the smart trans-
mitter terminal is connected to a transmitter and
communicating to a transmitter on another branch of a star
field bus, these communication lengths may be lower.
2 - 8
O N E C H A N N E L
1 2 3 4 5
N U M B E R O F T R A N S M IT TE R S
2-8 shows an example of single channel inputs on a
2-9
NOTE: Using wire less than 18 AWG decreases the maximum bus lengths
allowed.
NOTE: The maximum bus lengths shown in Figures
bus lengths without intrinsic safety barriers.
T W O C H A N N E L S
6 7 8 9 1 0 11
shows an example of 12 transmitters
2-6 and
12 1 3 1 4 1 5
T 0 3 99 1 A
2-7 are maximum
WBPEEUI260045A0