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Manual
00809-0500-4881
Table 8-20: BLOCK_ERR conditions
Condition
number
4
5
6
7
8
9
10
11
12
13
14
15
8.8.9
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.
8.8.10
Alarm detection
A block alarm is generated whenever the BLOCK_ERR has an error bit set.
The types of block errors for the AI block are defined in
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
Rosemount OCX8800C
(continued)
Condition name and description
Local override.
Device fault state set.
Device needs maintenance soon.
Input failure/process variable has bad status: The hardware is bad, or a bad
status is being simulated.
Output failure: The output is bad based primarily upon a bad input.
Memory failure.
Lost static data.
Lost NV data.
Readback check failed.
Device needs maintenance soon.
Power up.
Out of service: The actual mode is out of service.
F
OUNDATION
Block
errors.
Fieldbus
™
April 2023
131
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