3Com 59039-2 Network Router User Manual


 
2.5 OVER-RANGE/UNDER-RANGE DISPLAYS
If the process variable attains a value higher than the input scale maximum limit
(over-range) or lower than the input scale minimum limit (under-range), the upper
display will show:
for the over-range condition and:
for the under-range condition.
2.6 SENSOR BREAK INDICATION
If a break is detected in the sensor circuit, the four-digit display will show:
The reaction of the alarms to a detected sensor break is dependent upon the input type.
2.7 COLD JUNCTION COMPENSATION DISABLED
If a thermocouple input is fitted, the Cold Junction Compensation should
be enabled. If it is disabled, whenever the process variable is displayed,
the unit display will be as shown on the right.
2.8 RESETTING THE LATCHED ALARM
If Output 1 is configured to be a latched alarm output, once it becomes active it will
remain active (even if the alarm condition itself is cleared) until reset either from the
front panel or via the Remote Reset hardware option. To reset the latched alarm from
the front panel:
1. En sure that the nor mal Op er at ing Mode dis play (i.e. pro cess vari able)
is shown.
2. Press ei ther the Raise key or the Lower key for at least three sec onds.
The four-digit display will then show:
OM067-2 November, 2000 2-3
59039
1
8
-DIN Digi tal In di ca tor Sec tion 2
Prod uct Man ual - Vol ume I Op era tor Mode