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Advanced Diagnostics
Appendix
This software can access the diagnostic gateway, provided that the computer running the soft-
ware is located in the same subnet as the diagnostic gateway. Even if the TCP/IP settings are
not compatible to the currently used network, the software can continue to reach the gateway.
The software can be downloaded from the Pepperl+Fuchs website. For further detailed infor-
mation on the functionality of the software, refer to the PFDCT brief instructions.
8.8
Alarm Hysteresis and Reset
The hysteresis range prevents an activated alarm from being turned on and off repeatedly, if a
measured value oscillates around the limit value. When the measured value exceeds the alarm
value level, the corresponding maintenance or Out-of-Specification alarm is activated. This
alarm stops only if the measured value falls below the alarm value including the hysteresis
range or if someone resets the alarm manually.
Alarm
status
High
Limit
Figure 8.4
Type
Voltage
Current
Unbalance
Signal level
Noise
Jitter
The Maintenance-Required and Out-of-Specification limits for the I/O functionality of the KT-
MB-GT2AD.FF.IO also generate a configurable hysteresis.
If the FDS/OPC integration is used, alarms can be reset if the alarm is outside the alarm range,
but the alarm is still active because of the hysteresis. Open the advanced parameterization and
use the Reset buttons located in the configuration section of the alarm to clear the alarm in this
case.
8.9
Field Device Handling for PROFIBUS
PROFIBUS devices can have 2 different status:
•
In data exchange
•
Not in data exchange
ON
Hysteresis
Hysteresis and alarm status
OFF
t
Value
0.8 V
20 mA
10%
50 mV
25 mV
0.5 us
195
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