Alarms And Events; Simulation Function - YOKOGAWA digitalYEWFLO Series User Manual

7.2.2 Alarms and Events

Each digitalYEWFLO can report the following
alarms and events as alerts.
Analog Alerts (Generated when a process value
exceeds threshold)
By AI Block:
Discrete Alerts (Generated when an abnormal
condition is detected)
By Resource Block:
By Transducer Block: Block Alarm
By AI Block:
By PID Block:
Update Alerts (Generated when a important
(restorable) parameter is updated)
By Resource Block:
By Transducer Block: Update Event
By AI Block:
By PID Block:
An alert has the following structure:
Table 7.2 Alert Object
Subindex
Parameter
Name
1 1 1 Block Index
2 2 2 Alert Key
Standard
3 3 3
Type
4 4 4 Mfr Type
Message
5 5 5
Type
6 6 6 Priority
7 7 7 Time Stamp
8 8 Subcode
9 9 Value
Relative
10 10
Index
Static
8
Revision
11 11 9 Unit Index
Hi-Hi Alarm, Hi Alarm, Low
Alarm, Low-Low Alarm
Block Alarm, Write Alarm
Block Alarm
Block Alarm
Update Event
Update Event
Update Event
Explanation
Index of block from which
alert is generated
Alert Key copied from the
block
Type of the alert
Alert Name identified by
manufacturer specific DD
Reason of alert
notification
Priority of the alarm
Time when this alert is first
detected
Enumerated cause of this
alert
Value of referenced data
Relative Index of
referenced data
Value of static revision
(ST_REV) of the block
Unit code of referenced
data
<7. IN-PROCESS OPERATION>
7.3

Simulation Function

The simulation function simulates the input of a
function block and lets it operate as if the data was
received from the transducer block. It is possible to
conduct testing for the downstream function blocks
or alarm processes.
A SIMULATE_ENABLE jumper switch is mounted
on the digitalYEWFLO's amplifier. This is to prevent
the accidental operation of this function. When
this is switched on, simulation is enabled. (Read
Figure 7.2.) To initiate the same action from a
remote terminal, if REMOTE LOOP TEST SWITCH
is written to SIM_ENABLE_MSG (index 1044)
parameter of the resource block, the resulting action
is the same as is taken when the above switch is
on. Note that this parameter value is lost when the
power is turned off. In simulation enabled status,
an alarm is generated from the resource block, and
other device alarms will be masked; for this reason
the simulation must be disabled immediately after
using this function.
The SIMULATE parameter of AI block consists of
the elements listed in Table 7.3 below.
Table 7.3 SIMULATE Parameter
Sub-
Parameters
index
1 Simulate Status Sets the data status to be
simulated.
2 Simulate Value Sets the value of the data to be
simulated.
3 Transducer Status Displays the data status from the
transducer block. It cannot be
changed.
4 Transducer Value Displays the data value from the
transducer block. It cannot be
changed.
5 Simulate En/Disable Controls the simulation function of
this block.
When Simulate En/Disable in Table 7.3 above is
set to "Active", the applicable function block uses
the simulation value set in this parameter instead of
the data from the transducer block. This setting can
be used for propagation of the status to the trailing
blocks, generation of a process alarm, and as an
operation test for trailing blocks.
SIM. ENABLE Switch
Set to OFF during
normal operation.
Not used.
Figure 7.2 SIMULATE_ENABLE Switch Position
7-3
Description
1: Disabled (standard)
2: Active(simulation)
O
N
1
2
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