Hart Functionality; Profibus Pa And Foundation Fieldbus H1 Functionality - ABB TTF300 Series Commissioning Instructions

Electrical connections
s
4.5.2

HART functionality

Fig. 14
A Transmitter
Adding resistance R
U
Mmin
Where
U
Mmin
U
Smin
R
Ltg
R
250
For HART functionality, use supply isolators or PCS input cards with a HART mark. If this is not
possible, a  250 Ω (< 1100 Ω) resistor must be added to the interconnection.
The signal line can be operated with or without grounding. When establishing a ground
connection (minus side), make sure that only one side of the terminal is connected to the
equipotential bonding.
s
4.5.3

PROFIBUS PA and FOUNDATION Fieldbus H1 functionality

Fig. 15
A Transmitter
When connecting these components, observe the following condition:
U
Mmin
Where
U
Mmin
U
Smin
R
Ltg
24 - EN
Panel
A
increases the minimum supply voltage:
250
 U
+ 0.022 A x (R
Smin
: Minimum operating voltage of transmitter
: Minimum supply voltage of supply isolator / PCS input
: Line resistance between transmitter and supply isolator
: Resistance of resistor for HART functionality
Panel
A
 U
+ 0.012 A x R
Smin
: Minimum operating voltage of transmitter
: Minimum supply voltage of supply isolator / PCS input
: Line resistance between transmitter and supply isolator
+
U
M
-
R
Ltg
B Supply isolator / PCS input with supply
+ R )
Ltg 250
+
U
M
-
R
Ltg
B Segment coupler
Ltg
TTF300
Control room
R
250 +
U
S
-
B
Control room
+
U
S
-
B
A00095
A00094
CI/TTF300-X1