Yokogawa EJX930A - Manual (Page 35)

<3. Parameter Setting>
3-24
IM 01C25R02-01E
(1) Alarm Setting
Select the process variable at
Process Alert which
the alarm is set, then set the alert mode for that
value.
• Procedure to call up the display
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Detailed setup →
Output condition → Process Alerts →
DTM (HART 5) Configuration → Process Alerts →
Selection of
the process
variable for
alarm
→ Pres Alert Mode: Differential
pressure
→ SP Alert Mode: Static pressure
→ ET Alert Mode: External
temperature
→ Flow Alert Mode: Flow rate
Selection of
alert mode
Off: Disable the alert function
Hi Al Detect: High side alert detection
Lo Al Detect: Low side alert detection
Hi/Lo Al Detect: High and Low side
alert detection
(2) Threshold Level Setting
Set the threshold of high and low alert value for
alarm generation.
• Procedure to call up the display
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Detailed setup →
Output condition → Process Alerts →
DTM (HART 5) Configuration → Process Alerts →
Parameter Detail
→ Pres Hi Alert
Val
Set the threshold value of upper side
for differential pressure
→ Pres Lo Alert
Val
Set the threshold value of lower side
for differential pressure
→ SP Hi Alert
Val
Set the threshold value of upper side
for static pressure
→ SP Lo Alert
Val
Set the threshold value of lower side
for static pressure
→ ET Hi Alert
Val
Set the threshold value of upper side
for external temperature
→ ET Lo Alert
Val
Set the threshold value of lower side
for external temperature
→ Flow Hi Alert
Val
Set the threshold value of upper side
for flow rate
→ Flow Lo Alert
Val
Set the threshold value of lower side
for flow rate
3.3.12 Status Output and Pulse Output
EJX multivariable transmitter has a contact output.
Select the type of output, status output or pulse
output, and set the unit, value etc.
(1) Selecting of output signal
Status output or pulse output can be selected for
the contact output.
• Procedure to call up the display
DD (HART 5/7)
DTM (HART 7)
[Root Menu] → Detailed setup →
Output condition → Process Alerts →
DO config → DO Signal type
DTM (HART 5) Configuration → Process Alerts → DO
Signal type
Status Output On When Al.
Detect
Output is “ON” when
alert is detected
Off When Al.
Detect
Output is “OFF” when
alert is detected
Pulse Output Scaled Pulse Scaled pulse output
Frequency
Frequency output
<Example>
Set the status output to output an off signal when
the input pressure exceeds 75 kPa with the alert
mode of Hi. Al Detect.
1) Select “Off When Al. Detect”
2) Select “Pres Alert Mode: Differential pressure” (Refer
to subsection 3.3.11(1) Alarm Setting)
3) Select “Hi Al Detect: High side alert detection” (Refer
to subsection 3.3.11(1) Alarm Setting)
4) Enter “75kPa” to Pres Hi Alert Val (Refer to subsec-
tion 3.3.11(2) Threshold Level Setting)
CAUTION
Whenever turning on the transmitter or detecting
the short interruption, check if contact output
correctly reflects the alarm status and test
the ON/OFF action of contact output by the
parameter DO test to confirm that the contact
output operates correctly.
(2) Setting of status output
This feature is used for a transistor output (open
collector) of an on/off signal according to the
status of high and low alarm limits, which are
user-configurable values as shown in subsection
3.3.11 Alarm. The status output can be assigned
as any combination of the high or low limits of
the input pressure, input static pressure, external
temperature, or flow.