Standard Application; Standard Application With Hart Functionality - ABB TTH200 Commissioning Instruction

4.4

Standard application

s
Fig. 8
A Transmitter
When connecting these components, observe the following condition:
U
Mmin
Where:
U
Mmin
U
Smin
R
Ltg
For HART functionality, use supply isolators or PLC 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.
4.5

Standard application with HART functionality

Fig. 9
A Transmitter
Adding resistance R
U
Mmin
Where:
U
Mmin
U
Smin
R
Ltg
R
250
CI/TTH200-EN
Field
A
≤ U
+ 0.02 A x R
Smin Ltg
: Minimum operating voltage of transmitter
: Minimum supply voltage of repeater supply isolater / PLC input
: Line resistance between transmitter and supply isolator
Field
A
increases the minimum supply voltage:
250
≤ U
+ 0.02 A x (R
Smin Ltg
: Minimum operating voltage of transmitter
: Minimum supply voltage of repeater supply isolator / PLC input
: Line resistance between transmitter and supply isolator
: Resistance for HART functionality
+
U
M
-
R
Ltg
B Supply isolator/PLC input with supply
+
U
M
-
R
Ltg
B Supply isolator/PLC input with supply
+ R )
250
TTH200
Electrical connection
Control room
+
U
S
-
B
Control room
R
250 +
U
S
-
B
A00094
A00095
EN - 15