Panametrics PanaFlow XMT1000, User Manual, Page: 72 / 80

D.8 Analog input block
The analog input ( AI ) block (see figure 31 below) is designed
as a generalized signal conditioning function. The output
from an AI block can be connected to the fieldbus. The
AI block receives and processes data measured by the
transducer block and provides additional functions such
as scaling, filtering, alarm generation, and trending.
D.9 PID block
Figure 31: Analog input (AI) block
The PID function offers control based on a programmable
algorithm. The PID function block may be used with a valve
to control flow.
Note: See foundation fieldbus specifications for more detail
on use of the PID block.
D.10 Error handling
The flow meter publishes the error status on the fieldbus
along with the real data. The error status can be seen in the
CH_x_reported error parameter on the channel transducer
block . In addition, the quality parameter shown with each
of the process variables reports the error. In figure 32 below,
the CH1_REPORTED_ERROR shows as E1 .
Note: For more information on the actual measurement
errors and possible causes, see chapter 3, error codes and
troubleshooting .
Figure 32: Reported error
Whenever the meter is in measurement error, the
quality bit for the published parameter shows bad quality
(see figure 33 below). To change the quality bit to good , the
measurement error at the meter must be removed.
Notice the
QUALITY.STATUS field shows as bad and the
SUBSTATUS field shows as sensor failure . This information
indicates a measurement error which must be corrected.
Figure 33: Quality bit error
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