2-sensor input functionality / Dual sensor mode
54 TTF350
OI/TTF350-EN
Device
parameters
Description
DTM parameters
HMI LCD display
parameters
Effective range
Safety information
Differential
(S1-S2)
The differential
temperature from
sensor 1 minus
sensor 2 is
mapped to the
4 … 20 mA
analog output
according to the
parametrized
measuring range
(0°C … max.
differential
temperature)
<Device>
<Configuration>
<Measurement
Type / Primary
Variable (PV)>
<Device Setup>
<Input/output
assignment>
Differential (S1-S2)
Check safety
function
Differential
(S2-S1)
The differential
temperature from
sensor 2 minus
sensor 1 is
mapped to the
4 … 20 mA
analog output
according to the
parametrized
measuring range
(0°C … max.
differential
temperature)
<Device>
<Configuration>
<Measurement
Type / Primary
Variable (PV)>
<Device Setup>
<Input/output
Assignment>
Differential (S1-S2)
Check safety
function
Mean
The average of
two independent
sensors 1 and 2
is mapped to the
4 … 20 mA
analog output
according to the
parametrized
measuring range
<Device>
<Configuration>
<Measurement
Type / Primary
Variable (PV)>
<Device Setup>
<Input/output
assignment>
Mean
Check safety
function
Redundancy
With two
functioning
sensors for a
measuring inset,
the average is
mapped to the
4 … 20 mA
analog output for
the parametrized
measuring range.
When one sensor
fails, the temp
signal for the
functioning
sensor switches
bumplessly and is
mapped to the
4 … 20 mA
output.
<Device>
<Configuration>
<Measurement
Type / Primary
Variable (PV)>
<Device Setup>
<Input/output
assignment>
Redundancy
Check safety
function
Elec.
reading S1
The 4 … 20 mA
output signal
matches the
Ω
or
mV signal of
sensor 1
<Device>
<Configuration>
<Measurement
Type / Primary
Variable (PV)>
<Device Setup>
<Input/output
assignment>
Elec. reading S1
Check safety
function
Elec.
reading S2
The 4 … 20 mA
output signal
matches the
Ω
or
mV signal of
sensor 2
<Device>
<Configuration>
<Measurement
Type / Primary
Variable (PV)>
<Device Setup>
<Input/output
assignment>
Elec. reading S2
Check safety
function
