ABB TTF300 Note De Mise En Exploitation page 56

Electrical connections
4.5.1 Standard application
Fig. 8
A Transmitter
When connecting transmitters and power supplies, observe the following specification:
U
Mmin
Where
U
Mmin
U
Smin
R : Line resistance between transmitter and power supply
Ltg
For HART functionality, use power supplies or SPS input cards with HART mark. If this is not
possible, the interconnection must have a resistance ≥ 250 Ω (< 1100 Ω).
The signal line can be connected with or without ground. When connecting the ground (minus
side), make sure that only one side of the contact is connected to the equipotential bonding
system.
20 - EN
Field
A
≤ U
+ 0.02A x R
Smin Ltg
: Minimum operating voltage of transmitter (refer to technical data for transmitter)
: Minimum supply voltage of power supply / SPS input
+
U
M
-
R
Ltg
B Power supply / SPS input with supply
TTF300
Control room
+
U
S
-
B
CI/TTF300-X1
A00094