Output - Hart; Power Supply - ABB TTH200 Operating Instruction

TTH200 HEAD-MOUNT TEMPERATURE TRANSMITTER | OI/TTH200-EN REV. B
Output – HART®
Note
The HART® protocol is an unsecured protocol, as such the
intended application should be assessed to ensure that these
protocols are suitable before implementation.
Transmission characteristics
• Temperature linear
• Resistance linear
• Voltage linear
Output signal
• Configurable 4 to 20 mA (standard)
• Configurable 20 to 4 mA
(Dynamic range: 3.8 to 20.5 mA in accordance with NE 43)
Simulation mode
3.5 to 23.6 mA
Induced current consumption
< 3.5 mA
Maximum output current
23.6 mA
Configurable error current signal
• Overrange 22 mA (20.0 to 23.6 mA)
• Underrange 3.6 mA (3.5 to 4.0 mA)

Power supply

Two-wire technology, polarity safe; power supply lines = signal
lines
Note
Following calculations apply for standard applications. This
should be taken into consideration when working with a higher
maximum current.
Input terminal voltage
Non-Ex application:
U = 11 to 42 V DC
S
Ex applications:
U = 11 to 30 V DC
S
Maximum permissible residual ripple for input terminal
voltage
During communication, this is in accordance with the HART® FSK
'Physical Layer' specification.
Undervoltage detection on the transmitter
If the terminal voltage on the transmitter down-scales a value of
10 V, this may lead to an output current of I
Maximum load
R = (U − 11 V) / 0.022 A
B S
A TTH200
B TTH200 in Ex-applications
C HART® communication resistance (R
Figure 14: Maximum load depending on input terminal voltage
Maximum power
• P = U × 0.022 A
s
• Example: U = 24 V  P
s max
≤ 3.6 mA.
a
)
B
= 0.528 W
19