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6. STATUS AND DIAGNOSTIC INFORMATION
6-1
All Rights Reserved. Copyright © 2006, Rota Yokogawa
IM 01R01B02-01E-E 5th edition October 01, 2020 -00
Status and Diagnostic Information is an important feature of PROFIBUS PA communication. This chapter helps
to understand important details. The status enables a quality judgement of the delivered information and the
Diagnostic allows the analysis of the cause.
In case of event the status byte of the OUT parameter indicates the changed situation. By using the Physical
Block parameter DIAGNOSIS the user is able to get more information about the cause. The parameter
DIAGNOSIS_EXTENSION makes specific information available.
All flagged diagnostic items in the parameters DIAGNOSIS_MASK and DIAGNOSIS_MASK _EXTENSION
are supported inside RAMC.
As described in chapter 5.2 the user can switch between classical and condensed status and diagnostic
information. Choosing the classical indication gives more details. The condensed indication is reduced and the
status is aligned with NE 107 (see table 6.2).
In addition inside the Transducer Block the parameter DEVICE_STATUS1 to DEVICE_STATUS3 indicates
several diagnostic information.
6.1 Status description
The status Byte attached to the Process Variables and the OUT parameter consists of three parts:
•
Quality: informs about the status
• Substatus: details the status information
• Limits: Indicates limit violations
The status indication is based on the priority of the status, starting with the highest priority.
The tables below indicates the status information which may arise in case of events:
Table 6.1 Classic status
Quality
Substatus EDD
Limits
Value*
Priority
GOOD
-
*
0x80 … 0x83
Lowest
GOOD
warning
*
0x88 ... 0x8B
GOOD
alarm
*
0x8B ... 0x8F
UNCERTAIN
last usable value
*
0x44 … 0x47
UNCERTAIN
substitute value
Value constant
0x4B
UNCERTAIN
initial value
*
0x4C … 0x4F
UNCERTAIN
Range violation
Limit overflow
0x56
UNCERTAIN
sub-normal
ok
0x58 … 0x5B
UNCERTAIN
Value uncertain
*
0x50 … 0x53
BAD
configuration error
*
0x04 … 0x07
BAD
sensor failure
*
0x10 … 0x13
BAD
device failure
*
0x0C … 0x0F
BAD
out of service
Value constant
0x1F
BAD
out of service
ok
0x1C
Highest
* Limits status information as defined in table 6.3 cause value ranges
6. Status and Diagnostic Information