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Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
D-20
Figure D-6. Input Selector
Function Block Application
Example (SEL_TYPE = max)
Figure D-7. Input Selector
Function Block Application
Example (SEL_TYPE =
average) AVG_USE = 6
ISEL Block
Troubleshooting
IN1 = 126 °F
IN2 = 118 °F
IN3 = 104 °F
IN4 = 107 °F
OUT = 140 °F
To Another
Function Block
SEL_TYPE = max
Input Selector
(ISEL) Function
Block
IN5 = 112 °F
IN6 = 115 °F
IN7 = 130 °F
IN8 = 140 °F
To determine OUT for a 6-input reading, read all eight, sort in numerical order, drop the
highest and lowest values, and calculate the average.
IN1 = 126 °F
IN2 = 118 °F
IN3 = 104 °F
IN4 = 107 °F
OUT = 118 °F
To Another
Function Block
SEL_TYPE = avg
Input Selector
(ISEL) Function
Block
IN5 = 112 °F
IN6 = 115 °F
IN7 = 130 °F
IN8 = 140 °F
AVG_USE = 6
107 112 115 118 126 130+++++
6
-------------------------------------------------------------------------------------------- 118F=
Symptom Possible Causes Corrective Action
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. SELECT_TYPE must be set to
a valid value and cannot be left at 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. Typically,
BLOCK_ERR will show “Power-Up” for all blocks that are not scheduled. Schedule the
block to execute.
Status of output is BAD Inputs All inputs have Bad status
OP selected OP_SELECT is not set to 0 (or it is linked to an input that is not 0), and it points to an
input that is Bad.
Min good The number of Good inputs is less than MIN_GOOD.
Block is in OOS mode Change mode to Auto
Block alarms will not work. Features FEATURES_SEL in the resource block does not have Alerts enabled. Enable the
Alerts bit.
Notification LIM_NOTIFY in the resource block 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.
Cannot set HI_LIMIT,
HI_HI_LIMIT, LO_LIMIT,
LO_LO_LIMIT
Scaling Limit values are outside the OUT_SCALE.EU0 and OUT_SCALE.EU100 values.
Change OUT_SCALE or set values within range.