Yokogawa EJX930A - Manual (Page 23)

<3. Parameter Setting>
3-13
IM 01C25R05-01EN
3.4.6 Software Write Protection
EJX multivariable transmitter configured data is
saved by using a write protection function. The
write protection status is set to “Yes” when 8
alphanumeric characters are entered in the New
password field and transferred to the transmitter.
When write protection is set to ”Yes,” the transmitter
does not accept all the write possible parameters
changes. When the same eight alphanumeric string
entered in the New password field is also entered
in the Enable wrt 10min field and transferred to the
transmitter, it will be possible to change transmitter
parameters during a 10 minute period.
To change the transmitter from the write protection
”Yes” status back to write protection ”No” status,
use Enable wrt 10min to first release the write
protection function and then enter eight spaces in
the New password field.
• Procedure to call up the display
[Root Menu] → Detailed setup → Device information
→ Field device info → Wrt protect menu →
→ Write Protect
Display current protect mode
(Yes: protected, No: not protected)
→ Enable wrt 10
min
Release the protect function for 10
min.
→ New password Set the new password or change
the password
3.4.7 Alarm
The function is used to display the alarm codes
when the input differential pressure exceeds the
specified value within the calibration range. The
same is available for the input static pressure and
external temperature. Refer to Table 4.1 Alarm
Message Summary for the specific alarm code to
be generated.
(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
[Root Menu] → Detailed setup →Output condition →
Process Alerts →
Selection of
the process
variable for
alarm
→ Pres Alert Mode: Differential
pressure
→ SP Alert Mode: Static pressure
→ ET Alert Mode: External
temperature
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
[Root Menu] → Detailed setup →Output condition →
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