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Instruction Manual
IM-106-880C, OI
September 2009
Hazardous Area OCX 8800
7-28
Table 7-20. BLOCK_ERR
Conditions
Modes The AI Function Block supports three modes of operation as defined by the
MODE_BLK parameter:
• Manual (Man) The block output (OUT) may be set manually.
• Automatic (Auto) OUT reflects the analog input measurement or the
simulated value when simulation is enabled.
• Out of Service (O/S) The block is not processed. FIELD_VAL and PV
are not updated and the OUT status is set to Bad: Out of Service. The
BLOCK_ERR parameter shows Out of Service. In this mode, you can
make changes to all configurable parameters. The target mode of a
block may be restricted to one or more of the supported modes.
Alarm Detection A block alarm will be generated whenever the BLOCK_ERR has an error bit
set. The types of block error for the AI block are defined above.
Process Alarm detection is based on the OUT value. You can configure the
alarm limits of the following standard alarms:
• High (HI_LIM)
• High high (HI_HI_LIM)
• Low (LO_LIM)
• Low low (LO_LO_LIM)
In order to avoid alarm chattering when the variable is oscillating around the
alarm limit, an alarm hysteresis in percent of the PV span can be set using the
ALARM_HYS parameter. The priority of each alarm is set in the following
parameters:
•HI_PRI
•HI_HI_PRI
•LO_PRI
•LO_LO_PRI
Condition
Number
Condition Name and Description
0Other
1 Block Configuration Error: the selected channel carries a measurement
that is incompatible with the engineering units selected in XD_SCALE, the
L_TYPE parameter is not configured, or CHANNEL = zero.
2 Link Configuration Error
3 Simulate Active: Simulation is enabled and the block is using a simulated
value in its execution.
4 Local Override
5 Device Fault State Set
6 Device Needs Maintenance Soon
7 Input Failure/Process Variable has Bad Status: The hardware is bad, or a
bad status is being simulated.
8 Output Failure: The output is bad based primarily upon a bad input.
9 Memory Failure
10 Lost Static Data
11 Lost NV Data
12 Readback Check Failed
13 Device Needs Maintenance Soon
14 Power Up
15 Out of Service: The actual mode is out of service.