Yokogawa AXFA14G/C - Manual (Page 44)

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, a diagnostic message (DIAGNOSIS or
DIAGNOSIS_EXTENSION) is issued from the
physical block. When a diagnostic message is detected
in each function block or a diagnostic message in the
process value (process alarm) is detected, a diagnostic
message is issued from each block. If a LCD indicator
is installed, the error number is displayed. If two or
more alarms are issued, multiple error messages are
displayed.
When an alarm has been occurred, the corresponding
alarm name, description, and suitable countermeasure
will be displayed on the display unit. The normal
Display Mode and Alarm Mode may be displayed
alternatively. When a warning has been issued, the
corresponding content will be shown in the third line in
the Display Mode..
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 Warnings
The alarm and warning lists in each function block are
shown in table 6.1 and 6.2.