Spectrum Controls 1756sc-IF8u - Manual (Page 58)

46 ControlLogix ™ Universal Analog Input Module
.LAlarmLimit
REAL
A low alarm will activate if the value of the scaled input is at or below this
value. It will clear, if not latched, if it is above this level plus the
.AlarmDeadband amount.
.HAlarmLimit
REAL
A high alarm will activate if the value of the scaled input is at or above this
value. It will clear, if not latched, if it is below this level plus the
.AlarmDeadband amount.
.LLAlarmLimit
REAL
A low-low alarm will activate if the value of the scaled input is at or below
this value. It will clear, if not latched, if it is above this level plus the
.AlarmDeadband amount.
.HHAlarmLimit
REAL
A high-high alarm will activate if the value of the scaled input is at or
above this value. It will clear, if not latched, if it is below this level plus the
.AlarmDeadband amount.
.AlarmDeadband
REAL
A value used for determining when an alarm condition goes away. See
it’s use in the above alarm tags.
Input Signal Scaling:
With scaling, you change a quantity from one notation to another. When
you scale the module, you must choose two points along the module’s
operating range and apply low and high values to those points. For
example,you can cause a 4mA input to display 0% and a 20mA input to
display 100%. Scaling causes the module to return data to the controller
so that 4mA returns a value of 0% in engineering units and 20mA returns
a value of 100% in engineering units.
The module may operate with values beyond the 4mA to 20mA range. If
an input signal beyond the low and high signals is present at the module
(e.g.3mA), that data will be represented in terms of the engineering units
set during scaling. For example...
Configuration:
.RangeType = 6 (0-20mA)
.LowSignal = 4 (4mA)
.HighSignal = 20 (20mA)
.LowEngineering = 0 (0%)
.HighEngineering = 100 (100%)
Note: If the signal and engineering range are left at zero, the default
range is utilized. Refer to pages 2 and 3 for valid signal and engineering
ranges.