166
Reference Manual
00809-0100-4026, Rev HA
Section 7: Service and Troubleshooting
November 2014
Service and Troubleshooting
Table 7-15. Troubleshooting the AI Block
7 Input failure/process variable has bad status: The hardware is bad, or
a bad status is being simulated
14 Power up
15 Out of service: The actual mode is out of service
Symptom Possible causes Recommended actions
Bad or no level readings
(Read the AI “BLOCK_ERR”
parameter)
BLOCK_ERR reads OUT OF
SERVICE (OOS)
1. AI Block target mode target mode set to OOS.
2. Resource Block OUT OF SERVICE.
BLOCK_ERR reads
CONFIGURATION ERROR
1. Check CHANNEL parameter (see “CHANNEL” on
page 293).
2. Check L_TYPE parameter (see “L_TYPE” on page 293)
3. Check XD_SCALE engineering units. (see “XD_SCALE
and OUT_SCALE” on page 294
BLOCK_ERR reads POWERUP Download Schedule into block. Refer to host for
downloading procedure.
BLOCK_ERR reads BAD INPUT 1. Sensor Transducer Block Out Of Service (OOS)
2. Resource Block Out of Service (OOS)
No BLOCK_ERR but readings
are not correct. If using
Indirect mode, scaling could
be wrong
1. Check XD_SCALE parameter.
2. Check OUT_SCALE parameter.
(see “XD_SCALE and OUT_SCALE” on page 294)
OUT parameter status reads
UNCERTAIN and substatus reads
EngUnitRangViolation
Out_ScaleEU_0 and EU_100
settings are incorrect.
See “XD_SCALE and OUT_SCALE” on page 294.
Mode will not leave OOS Target mode not set Set target mode to something other than OOS.
Configuration error BLOCK_ERR will show the configuration error bit set. The
following are parameters that must be set before the
block is allowed out of OOS:
CHANNEL must be set to a valid value and cannot be left
at initial value of 0.
XD_SCALE.UNITS_INDX must match the units in the
transducer block channel value.
L_TYPE must be set to Direct, Indirect, or Indirect Square
Root and cannot be left at initial value of 0.
Resource block The actual mode of the Resource block is OOS. See
Resource Block Diagnostics for corrective action.
Schedule Block is not scheduled and therefore cannot execute to
go to Target Mode. Schedule the block to execute.
Process and/or block alarms will
not work
Features FEATURES_SEL does not have Alerts enabled. Enable the
Alerts bit.
Notification LIM_NOTIFY is not high enough. Set equal to
MAX_NOTIFY.
Status Options STATUS_OPTS has Propagate Fault Forward bit set. This
should be cleared to cause an alarm to occur.
Value of output does not make
sense
Linearization Type L_TYPE must be set to Direct, Indirect, or Indirect Square
Root and cannot be left at the initial value of 0.
Scaling Scaling parameters are set incorrectly:
XD_SCALE.EU0 and EU100 should match that of the
transducer block channel value.
OUT_SCALE.EU0 and EU100 are not set properly.
Cannot set HI_LIMIT,
HI_HI_LIMIT, LO_LIMIT, or
LO_LO_LIMIT Values
Scaling Limit values are outside the OUT_SCALE.EU0 and
OUT_SCALE.EU100 values. Change OUT_SCALE or set
values within range.
Condition
number
Condition name and description
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