Endress+Hauser Proline Prowirl 72 - Page 47

Proline Prowirl 72 FOUNDATION Fieldbus 9 Troubleshooting
Endress + Hauser 47
Faulty connection to fieldbus host system (contd.)
Fieldbus voltage Check that a min. bus voltage of 9 V DC is present at terminals 1/2. Permissible
range: 9 to 32 V DC
Network structure Check permissible fieldbus length and number of spursPage 21
Basic current Is there a basic current of min. 16 mA?
Fieldbus address Check bus address: make sure there are no double assignments!
Terminating resistors Has the FOUNDATION Fieldbus network been terminated correctly?
Each bus segment must always be terminated with a bus terminator at both ends
(start and finish). Otherwise there may be interference in communication.
Current consumption
Permissible feed current
Check the current consumption of the bus segment:
The current consumption of the bus segment in question (= total of basic currents of
all bus users) must not exceed the max. permissible feed current of the bus power
supply unit.
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Problems when configuring function blocks
Transducer Blocks:
The operating mode cannot be
set to AUTO.
Check whether the operating mode of the Resource Block is set to
AUTO MODE_BLK parameter group / TARGET parameter.
Analog Input Function Block:
The operating mode cannot be
set to AUTO.
There can be several reasons for this. Check the following points one after another:
1. Check whether the operating mode of the Analog Input Function Block is set to
AUTO. MODE_BLK parameter group / TARGET parameter. If not and the mode
cannot be changed to AUTO, first check the following points.
2. Make sure that the CHANNEL parameter (select process variable) has already
been configured in the Analog Input Function Block (see Page 40). The option
CHANNEL = 0 (uninitialized) is not valid.
3. Make sure that the XD_SCALE parameter group (input range, unit) has already
been configured in the Analog Input Function Block (see Page 40) (incl.
configuration example)
" Caution!
Make sure that the unit selected suits the process variable chosen in the CHANNEL
parameter. Otherwise the BLOCK_ERROR parameter displays the "Block
Configuration Error" error message. In this state, the operating mode cannot be set
to AUTO.
4. Make sure that the L_TYPE parameter (linearization type) has already been
configured in the Analog Input Function Block (see Page 40).
5. Check whether the operating mode of the Resource Block is set to AUTO.
MODE_BLK parameter group / TARGET parameter
6. Make sure that the function blocks are correctly connected together and that this
system configuration has been sent to the fieldbus users (Page 42)
Analog Input Function Block:
Although the operating mode is
set to AUTO, the status of the AI
output value OUT is "BAD" or
"UNCERTAIN".
Check whether an error is pending in the Transducer Block "Diagnosis"
 Transducer Block "Diagnosis"  "Diagnosis - Actual System Condition"
parameter.
Error messagesPage 49
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