Honeywell Series A - Page 56

3. Fieldbus Integration With Experion System
3.2. Control Integration
56 Experion PKS Series A Fieldbus Interface Module User's Guide R400
Honeywell July 2010
Fault-State Initiation, Indication
Local Override Indication
Worst Case Alarm Indication
Upstream Block Class Identification
The status byte structure consists of a 2-bit quality, most significant bit, field; a 4-bit
substatus field; and a 2-bit limits, least significant bit, field. The following table provides
a breakdown of bit assignments for general reference. The value of the quality field
determines the applicable substatus field indication.
Bit Quality Substatus, if Quality field is Limits
BAD UNCERTAIN
GOOD
(Non-
Cascade)*
GOOD
(Cascade)*
0
BAD Data
Quality
Non-
Specific
Non-Specific Non-Specific
Non-
Specific
No Limits
1
UNCERTAI
N Data
Quality
Configura-
tion Error
Last Usable
Value
Active Block
Alarm
Initialization
Acknow-
ledge (IA)
Low Limit
2
GOOD
(Non-
Cascade)
Data
Quality
Not
Connected
Substitute
Active
Advisory
Alarm
Initialization
Request
(IR)
High
Limit
3
GOOD
(Cascade)
Data
Quality
Device
Failure
Initial Value
Active
Critical
Alarm
Not Invited
(NI)
Constant
4
Sensor
Failure
Sensor
Conversion
Not Accurate
Unacknow-
ledged Block
Alarm
Not
Selected
(NS)
5
No Comm-
unication,
with Last
Usable
Value
Engineering
Unit Range
Violation
Unacknow-
ledged
Advisory
Alarm
Do Not
Select
(DNS)