Reference Manual
00809-0100-4697, Rev EA
October 2011
D-13
Rosemount 848T
Modes
The MAI Function Blo c k su pp orts thre e modes of operation as d efined by the
MODE_BLK parameter:
Manual (Man)
The block output (OUT) may be set manually
Automatic (Aut o)
OUT_1 to OUT_8 reflects the analog input measurement or the simulated
value when simulation is enabled.
Out of Service (OOS)
The block is not processed. PV is not upda ted and the OUT stat us is set to
Bad: Out of Service. The BLOCK_ERR parameter shows Out of Service.
In this mode, changes can be made to all configurable par ameters. The
target mode of a block may be restricted to one or more of the supported
modes.
Status Handling
Normally, the status of the PV reflects the status of the measurement valu e,
the operating condition of the I/O card, and any active alarm condition. In Auto
mode, OUT reflects the value and st atus quality of the PV. In Man mode, the
OUT sta tus constant lim it is set to indicate that the value is a con stant an d the
OUT status is Good.
If the sensor limit exceeds the hig h or low sid e rang e, PV status is set high or
low and EU range status is set to uncertain.
In the STATUS_OPTS paramete r, select from the following options to control
the status handling:
BAD if Limited
Sets the OUT status quality to Bad when the value is higher or lower than
the sensor limits.
Uncertain if Limited
Sets the OUT st atus qu ality to Uncertain when the value is higher or lower
than the sensor limits.
Uncertain if in Manual mode
The status of the Output is set to Uncertain when the mode is set to
Manual
NOTES
1. The instrument must be OOS to set the status option.
2. The MAI block only supports the BAD if Limited option.