11 Operation using PROFIBUS
®
PA TMT84
84 Endress + Hauser
Fail Safe Mode read/
write
For selecting failsafe mode in the event of a device error or
bad measured value.
ACTUAL MODE (current operating mode of the block)
remains in AUTO MODE (automatic operation).
! Note!
The status information only applies to diagnostics as per
Profile 3.0/3.01. For Profile 3.02, see chapter 9.2.2.
Options:
• FSAFE VALUE (The substitute value is adopted in the
output value).
When this option is selected, the value entered in the
"Fail Safe Default Value" parameter is displayed in OUT
(output value).
The status changes to UNCERTAIN - SUBSTITUTE
VALUE.
• LAST GOOD VALUE (The last valid output value saved
is adopted in the output value)
The output value valid before the failure is used. The
status is set to UNCERTAIN – LAST USABLE VALUE
(last valid value). If there was no valid value previously,
the initial value is provided with the status UNCER-
TAIN – INITIAL VALUE (for values not saved during a
device reset). The initial value of the TMT84 Profibus
PA is "0".
• WRONG VALUE (Incorrect measured value at the out-
put value). The value is still used for calculation despite
the bad status.
Factory settings:
WRONG VALUE
Fail Safe Default
Value
read/
write
This parameter is used to enter a default value to be dis-
played when there is an error in OUT (output value) (see
Failsafe Mode).
Factory settings:
0
AI(n) simulation
quality
read/
write
Simulation of Analog Input function block quality. For list
of options, Page 80.
Factory settings:
Bad
AI(n) simulation
status
read/
write
Simulation of Analog Input function block status.
0x00 - OK
0x01 - Limit underflow
0x02 - Limit overflow
0x03 - Value constant
AI(n) simulation
value
read/
write
Simulation of the input value. Since this value runs
through the entire algorithm, the behavior of the Analog
Input function block can be checked.
Factory settings:
0.0
AI(n) simulation
enable
read/
write
Enable/disable simulation.
Options:
Disabled
Enabled
Factory settings:
Disabled
Analog Input
Menu item Parameter
"Communication" Name
Parame-
ter access
Description
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