Self-Check Function; Types Of Diagnosis Functions; Alarm High/Low Limit Function - YOKOGAWA Admag TI Series User Manual

5.9

Self-check Function

5.9.1

Types of Diagnosis Functions

This product has the self-check functions to diagnose device failures or process states.
The diagnosis functions of this instrument are as follows:
Diagnosis function
High/low limit alarm notification
Electrode adhesion detection
Sensor empty check
Misconnection detection
Verification (device health
diagnosis) function
Electrode insulation deterioration
diagnosis
Flow noise diagnosis
Diagnosing low conductivity
Coil insulation diagnosis
5.9.2

Alarm High/Low Limit Function

When the PV-mapped physical quantity of Subsection 5.1.2 exceeds the set value, the alarm
can be displayed with the high/low limit function of the alarm. However, to activate an alarm on
communication, it is necessary to specify the priority for alarm activation in advance. To activate
an alarm, set 3 or more. By sending with priority information being added in a communication
frame when the alarm is activated, for example, the alarm is used to apply a filter to ignore values
below the specified priority on the host side. This function also can output an alarm occurrence
as a status output.
For details about the status output, refer to Section 5.14.
As a value to judge an alarm, the following four values can be set: high limit, high-high limit, low
limit, and low-low limit.
The setting can be configured with the following parameters.
Menu path
Display
F
OUNDATION
Fieldbus
*For AXG, one from Al1 to Al4, and for AXW, one from AI1 to AI3.
Block Name
AI1 - AI4 (AXG)
AI1 - AI3 (AXW)
AI1 - AI4 (AXG)
AI1 - AI3 (AXW)
AI1 - AI4 (AXG)
AI1 - AI3 (AXW)
AI1 - AI4 (AXG)
AI1 - AI3 (AXW)
Displays an alarm when the specified value is exceeded and outputs it as the
status output.
Diagnoses an electrode adhesion from the resistance value of the electrode,
and displays a warning or alarm if adhesion is detected.
Checks whether the sensor is in the empty pipe state, and displays an alarm
if the empty pipe state is detected.
Checks whether the transmitter signal line and the excitation line are
correctly connected, and displays a warning if a misconnection is detected.
Diagnoses the health of the product, and displays its result.
Diagnose the deterioration of insulation from the resistance value of the
electrode, and displays a warning if it is detected. (Only available for AXG,
not for AXW).
Measures a flow noise detected in the sensor, and displays a warning if the
measured value exceeds the specified value. (Only available for AXG, not for
AXW).
Obtains the conductivity from the resistance value and size of the electrode,
and displays a warning if the conductivity falls below the specified value.
(Only available for AXG, not for AXW).
By diagnosing the current value of exciting current, a warning is displayed
when the insulation is deteriorated.
--
Diagnostic ► AI1* ► Device Diagnostics ► Diagnostics/Alerts ► Priority/Limits ►
(see below)
Relative
Index
Display
26 - High High Limit
28 - High Limit
30 - Low Limit
32 - Low Low Limit
<5. Functions>
Description
Parameter
F Fieldbus
OUNDATION
127
Description
Specifies the high-high limit to
judge an alarm.
Specifies the high limit to
judge an alarm.
Specifies the low limit to judge
an alarm.
Specifies the low-low limit to
judge an alarm.
IM 01E21A02-03EN