Yokogawa AXFA14G/C - Manual (Page 39)

IM 01E20F02-01E 6-1
6. IN-PROCESS OPERATION
6. IN-PROCESS OPERATION
This chapter describes the procedure performed when
changing the operation of the function block of the
AXF in process.
6.1 Mode Transition
When the function block mode is changed to
Out_Of_Service, the function block pauses and a block
alarm is issued.
When the function block mode is changed to Manual,
the function block suspends updating of output values.
In this case alone, it is possible to write a value to the
OUT parameter of the block for output. Note that no
parameter status can be changed.
6.2 Generation of Alarm
6.2.1 Indication of Alarm
When the self-diagnostics function indicates that a
device is faulty, an alarm (device alarm) is issued from
the resource block. When an error (block error) is
detected in each function block or an error in the
process value (process alarm) is detected, an alarm is
issued from each block. If an LCD indicator is in-
stalled, the error number is displayed. If two or more
alarms are issued, multiple error numbers are dis-
played.
For details of ALARM, refer to Section 7.2.
Upon occurrence of an alarm
(example: a System alarm)
Upon issuance of a warning
(a description appears in the 3rd line only
when a warning is occurred)
Alarm name
Description
Countermeasure
message
Description of
warning
F0601.EPS
Figure 6.1 Error Identification on Indicator
6.2.2 Alarms and Events
The following alarms or events can be reported by the
AXF if Link object and VCR static entry are set.
Analog Alerts (Generated when a process value
exceeds threshold)
By AI Block
Hi-Hi Alarm, Hi Alarm, Low
Alarm, Low-Low Alarm
Discrete Alerts (Generated when an abnormal
condition is detected)
By Resource Block
Block Alarm, Write Alarm
By Transducer Block Block Alarm
By AI, DI, IT, AR and PID Blocks Block Alarm
Update Alerts (Generated when an important
(restorable) parameter is updated)
By Resource Block
Update Event
By Transducer Block Update Event
By AI, DI, IT, AR and PID Blocks Update Event
An alert has following structure:
Table 6.1 Alert Object
T0601.EPS
Parameter
Name
Explanation
1 Block Index Index of block from which
alert is generated
2 Alert Key Alert Key copied from the
block
3 Standard
Type Type of the alert
4 Mfr Type Alert Name identified by
manufacturer specific DD
5
1
2
3
4
5 Message
Type Reason of alert notification
1
2
3
6 Priority Priority of the alarm
7 Time Stamp Time when this alert is first
detected
6
7
6
7
8 Subcode Enumerated cause of this
alert
9 Value Value of referenced data
8
9
10 Relative
Index Relative index of referenced
data
Static
Revision Value of static revision
(ST_REV) of the block
10
8
11 Unit Index Unit code of referenced data 11 9
4
5
Subindex
Analog Alert Discrete Alert Update Alert