Page 102 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide Revision 2.0
Troubleshooting the Analog Input (AI) block
Table 24: Analog Input block
Problem cause Things to check Recommended action
Analog Input block mode
is in OOS and does not
change to AUTO mode.
Read
MODE_BLOCK.PERMITTED
Add AUTO mode to
MODE_BLOCK.PERMITTED.
Read MODE_BLOCK.
ACTUAL of Resource block.
If necessary, Set
MODE_BLOCK.TARGET to AUTO.
NOTE: If the mode is set to OOS for
maintenance, then do not change the
mode to AUTO.
Read WRITE_LOCK
parameter in resource block.
Check if device is in Write
Protect mode.
If WRITE_LOCK = Locked (2)
Change Write Protect jumper to “W”
position. (See section 6.6)
Reset the device. (Cycle power to
transmitter or write “Processor” to
RESTART parameter in Resource block.)
Schedule Block is not scheduled and therefore
cannot execute to go to Target Mode.
Schedule the block to execute.
Analog Input block mode
is in OOS mode with
Block Configuration Error.
Read CHANNEL parameter
and range.
CHANNEL must be set to a valid value
and cannot be left at the initial value of
zero.
XD_SCALE.UNITS_INDX must be
compatible with the units in the transducer
block for the channel.
Read L_TYPE parameter. L_TYPE must be set to Direct, Indirect, or
Indirect Square Root and cannot be left at
the initial value of zero.
Check if L_TYPE= Direct When L_TYPE = Direct, XD_SCALE and
OUT_SCALE must contain the same
range values (EU_0 and EU_100).
Value of output seems
wrong.
Read Linearization Type.
Check the L_TYPE setting.
Read Scaling.
Check XD_SCALE and OUT_SCALE
Process and block alarms
do not work.
Read FEATURE_SEL. Reports are not selected in
FEATURE_SEL. If features do not include
Reports then the host must poll for alarms.
Read LIM_NOTIFY Set LIM_NOTIFY to a value higher than
zero, but not higher than MAX_NOTIFY.
Read Alarm Summary Disable. Check that process and block alarms are
not disabled.
Cannot set alarm limits. Read Scaling. Limit values are outside the
OUT_SCALE.EU_0 and
OUT_SCALE.EU_100 values. Set values
within range.
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