4 in-process operation, 4-1 mode transition, 4-2 generation of alarm – Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer User Manual
Page 27: 4-2-1 indication of alarm, 4-2-2 alarms and events, 4 in-process operation -22, 4-1 mode transition -22, 4-2 generation of alarm -22, 4-2-1 indication of alarm -22, 4-2-2 alarms and events -22
IM 12A00A01-61E
3-22 Foundation Fieldbus
3-4 In-process operation
This chapter describes the procedure performed when changing the operation of the function block of the
EXA in process.
3-4-1 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 val-
ues. 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.
3-4-2 Generation of Alarm
3-4-2-1 Indication of Alarm
Figure 3.12 Error Identification on Indicator
3-4-2-2 Alarms and Events
Following alarm or event can be reported by EXA as an alert if allowed.
Analog Alerts
(Generated when a process value exceeds threshold)
By AI1 Block
Hi-Hi Alarm, Hi Alarm, Low Alarm, Low-Low Alarm
By AI2 Block
Hi-Hi Alarm, Hi Alarm, Low Alarm, Low-Low Alarm
By AI3 Block
Hi-Hi Alarm, Hi Alarm, Low Alarm, Low-Low Alarm
Discrets Alerts
(Generated when an abnormal condition is detected)
By Resource Block
Block Alarm, Write Alarm
By Transducer Block
Block Alarm
By AI1 Block
Block Alarm
By AI2 Block
Block Alarm
By AI3 Block
Block Alarm
Update Alerts
(Generated when a important (restorable) parameter is updated)
By Resource Block
Update Event
By Transducer Block
Update Event
By AI1 Block
Update Event
By AI2 Block
Update Event
By AI3 Block
Update Event