Endress+Hauser iTEMP TMT84 - Page 71

TMT84 11 Operation using PROFIBUS
®
PA
Endress + Hauser 71
Measure type n read/
write
Displays the calculation process for Primary Value 1,
also see Chapter 11.2.2
! Note!
SV1 = Secondary Value 1 =
sensor value 1 in temperature Transducer Block 1 =
sensor value 2 in temperature Transducer Block 2
SV2 = Secondary Value 2 =
sensor value 2 in temperature Transducer Block 1 =
sensor value 1 in temperature Transducer Block 2
Options:
Sensor Transducer 1 (Measuring mode 1):
• PV = SV1: Secondary value 1
• PV = SV1-SV2: Difference
• PV = 0.5 x (SV1+SV2): Average
• PV = 0.5 x (SV1+SV2) redundancy: Average or Sec-
ondary Value 1 or Secondary Value 2 in the event of a
sensor error in the other sensor.
• PV = SV1 (OR SV2): Backup function: If sensor 1 fails,
the value of sensor 2 automatically becomes the Pri-
mary Value.
• • PV = SV1 (OR SV2 if SV1>T): PV changes from SV1
to SV2 if SV1 > value T (Parameter: Threshold value
n)
• PV =(|SV1-SV2|) if PV> drift value: PV is the drift value
between sensor 1 and sensor 2. If PV exceeds the con-
figured drift value (Sensor drift alert value), a drift
alarm is output.
• PV =(|SV1-SV2|) if PV< drift value: PV is the drift value
between sensor 1 and sensor 2. If PV undershoots the
configured drift value (Sensor drift alert value), a
drift alarm is output.
Factory settings:
PV = SV1
Sensor Transducer 2 (Measuring mode 2):
• PV = SV2: Secondary value 2
• PV = SV2-SV1: Difference
• PV = 0.5 x (SV2+SV1): Average
• PV = 0.5 x (SV2+SV1) redundancy: Average or Sec-
ondary Value 1 or Secondary Value 2 in the event of a
sensor error in the other sensor.
• PV = SV2 (OR SV1): Backup function: If sensor 2 fails,
the value of sensor 1 automatically becomes the Pri-
mary Value.
• PV = SV2 (OR SV1 if SV2>T): PV changes from SV2 to
SV1 if SV2 > value T (Parameter: Threshold value n)
• PV =(|SV1-SV2|) if PV> drift value: PV is the drift value
between sensor 1 and sensor 2. If PV exceeds the con-
figured drift value (Sensor drift alert value), a drift
alarm is output.
• PV =(|SV1-SV2|) if PV< drift value: PV is the drift value
between sensor 1 and sensor 2. If PV undershoots the
configured drift value (Sensor drift alert value), a
drift alarm is output.
Factory settings:
• PV = SV1 = Sensor 2
2-wire compensa-
tion n
read/
write
Two-wire compensation for RTDs.
The following values are permitted: 0 to 30 Ohm
Sensor 1 / Sensor 2
Menu item Parameter
"Sensor"
Submenu
"Sensor 1" or "Sen-
sor 2"
Name
Parame-
ter access
Description