ABB CM30 User Manual page 35

ControlMaster CM30 and CM50
Universal process controllers,
...Input/Output / ...Analog Inputs / ...Analog Input 1 (4)
Eng. Low
Eng. High
Pulse Units
Pulse / Unit
Broken Sensor
None
Automatic
Upscale
Downscale
Filter Time
Fault Detect
Zero Adjustment
Span Adjustment
IM/CM/ED–EN Rev. B
1 1
/ and / DIN
4 2
Specifies the engineering low (minimum) value.
For example, for an electrical input range of 4.0 to 20.0 mA, representing a pressure
range of 50 to 250 bar, set the Eng Low value to 50.0 and the Eng High value to 250.0.
Not applicable for Pulse Input – see page 32.
Specifies the engineering high (maximum) value.
See Eng Low for range example.
Not applicable for Pulse Input.
Selects the unit of measure for the pulse input type.
Sets the number of pulses required to represent 1 pulse unit (as set above). 
For example, if Pulse Units = Kl and Pulse / Unit = 10.00000000, each pulse represents
0.1 Kl, 10 pulses = 1 Kl.
If an input failure occurs, the input value can be configured to drive in a set direction.
No action taken.
If the value of failed input is below Eng Low, the input value is driven to minimum
downscale value; otherwise it is driven to the maximum upscale value.
The input is driven to the maximum upscale value.
The input is driven to the minimum downscale value.
The input is averaged over the time set.
Sets a tolerance level (in % of engineering range) to allow for deviation of the input signal
above or below the engineering range before an input failure is detected.
The Zero Adjustment and Span Adjustment parameters enable fine tuning of the inputs
to eliminate system errors. Apply a known input value and adjust until the required input
value is displayed.
Normally, Zero Adjustment is used with input values close to Eng Low (adjustment is
performed by applying an offset to the reading) and Span Adjustment is used with
values close to Eng High (adjustment is performed by applying a multiplier to the
reading).
7 Advanced Level
33