Table 8-31: Block Error Conditions
(continued)
Condition
number
Condition name and description
13 Device Needs Maintenance Now
14 Power Up: The device was just powered up.
15 Out of Service: The actual mode is out of service.
8.12.2 Modes
The ISEL 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. 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.
8.12.3 Alarm detection
A block alarm will be generated whenever the BLOCK_ERR has an error bit set.
The types of block error for the ISEL block are defined above.
Alarms are grouped into five levels of priority, Table 8-32.
Table 8-32: Alarm Priorities
Priority
number
Priority description
0 The priority of an alarm condition changes to 0 after the condition that
caused the alarm is corrected.
1 An alarm condition with a priority of 1 is recognized by the system, but
is not reported to the operator.
2 An alarm condition with a priority of 2 is reported to the operator, but
does not require operator attention (such as diagnostics and system
alerts).
3-7 Alarm conditions of priority 3 through 7 are advisory alarms of
increasing priority.
8-15 Alarm conditions of priority 8 to 15 are critical alarms of increasing
priority.
FOUNDATION
™
Fieldbus Manual
December 2022 00809-0500-4880
208 Emerson.com/Rosemount
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