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Integration
System configuration
SIMATIC S7-400
Control system
U
H
A
4...20 mA
SITRANS TW
transmitter
HART
HART
communi-
modem
cator
or
Possible system configurations
The SITRANS TW transmitter as a four-wire rail-mounted device
can be used in a number of system configurations: as a stand-
alone version or as part of a complex system environment, e.g.
with SIMATIC S7. All device functions are available via HART
communication.
Communication options through the HART interface:
• HART communicator
• HART modem connected to PC/laptop on which the appropri-
ate software is available, e.g. SIMATIC PDM
• HART-compatible control system (e.g. SIMATIC S7-400 with
ET 200M)
© Siemens AG 2009
SITRANS T measuring instruments for temperature
SIMATIC PDM
ET 200M
or
Load
PC/laptop with
SIMATIC PDM
RS-232-C
Transmitters for rail mounting
four-wire system, universal, HART
Technical specifications
Input
Selectable filters to suppress the
line frequency
Resistance thermometer
Measured variable
Measured range
Measured span
Sensor type
• DIN IEC 751
• Acc. to JIS C 1604-81
• Acc. to DIN 43760
≤ 500 Ω)
• Special type (R
RTD
Voltage measurement
Type of connection
Connection
Measuring range limits
Sensor breakage monitoring
Sensor short-circuit monitoring
Resistance-based sensors,
potentiometers
Measured variable
Measured range
Measured span
Voltage measurement
Type of connection
Connection
Input range
Sensor breakage monitoring
Sensor short-circuit monitoring
SITRANS TW
50 Hz, 60 Hz, also 10 Hz for spe-
cial applications (line frequency
filter is similar with measuring fre-
quency)
Temperature
Parameterizable
Min. 25 °C (45 °F) x 1/scaling
factor
Pt100 (DIN IEC 751)
Pt100 (JIS C1604-81)
Ni100 (DIN 43760)
Multiples or parts of the defined
characteristic values can be
parameterized (e.g. Pt500, Ni120)
Temperature-linear, resistance-
linear or customer-specific
• Normal connection
• Sum or parallel connection
• Mean-value or differential
connection
2, 3 or 4-wire circuit
Depending on type of connected
thermometer (defined range of
resistance thermometer)
Monitoring of all connections for
open-circuit (function can be
switched off)
Parameterizable response thresh-
old (function can be switched off)
Ohmic impedance
Parameterizable
Min. 10 Ω
Resistance-linear or customer-
specific
• Normal connection
• Differential connection
• Mean-value connection
2, 3 or 4-wire circuit
0 ... 6000 Ω;
with mean-value and difference cir-
cuits: 0 ... 3000 Ω;
Monitoring of all connections for
open-circuit (function can be
switched off)
Parameterizable response thresh-
old (function can be switched off)
Siemens FI 01 · 2010
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