5.2.3 Input Ranges and Limits

P2

Select P2 to configure the number of Decimal Places

This sets the maximum displayed resolution for the process variable and other process settings. Up to two decimal places may be selected for any input type.

Choose from the list below:-

See the table ‘Input Types and Ranges’ in the previous section for default values.

Example:

mV Input Scaling

In this example the display is required to read

-1000 for a mV input of -5.0 and

+2000 for a mV input +20.0.

Select configuration level (see section 5.1):

Select P2 and adjust to nnnn

Select P3 and adjust to -1000

Select P4 and adjust to +2000

Select P5 and adjust to -5.0mV

Select P6 and adjust to +20.0mV

Note: In operator level, if the input signal is exceeded a sensor break S.br is indicated.

mA Input Scaling

Using an external burden resistor of 2.49Ω, the controller can be made to accept 0-20mA or 4-20mA from a current source.

In this case the default value of -1999 is indicated for an input of 0 or 4mA and 3000 for an input of 20mA.

Adjust P3 and P4 for the display readings required for a particular application.

Note: In operator level, if the input signal is exceeded a sensor break S.br is indicated.

nnnn

No decimal places (factory default)

The instrument will display numbers with the selected settings unless they would not fit onto the 4 digit display. In this event a rounded reduced resolution number is displayed. For example, 123.45 would be displayed as 123.5.

nnn.n

One decimal place

nn.nn

Two decimal places

P3

Select P3 to configure the Low Range Limit for the input type selected.

The Low Scale Range Value sets a lower setpoint limit on the sensor being used. It may be used to set a safe range for operator setpoint adjustment. Range limits are automatically clipped to the range of the sensor being used.

Range limits are also used in conjunction with the Linear Input High and Low values to set the display range for linear inputs.

The low scale value is also clipped to the High Range Limit (P4).

Default value -328.

P4

Select P4 to configure the High Range Limit for the input type selected.

The High Scale Range Value sets an upper setpoint limit on the sensor being used. It may be used to set a safe range for operator setpoint adjustment. Range limits are automatically clipped to the range of the sensor being used.

Range limits are also used in conjunction with the Linear Input High and Low values to set the display range for linear inputs.

The high scale value is also clipped to the Low Range Limit (P3).

Default value 2502.

P5

Select P5 to configure the Low Range Limit for Linear millivolt inputs. (P5 is only shown for mV linear inputs).

Linear input types allow the mapping of a millivolt value to a configurable display range. The example shown opposite shows how to do this.

-10.00 to +80mV

Default value 0.00

P6

Select P6 to configure the High Range Limit for Linear millivolt inputs. (P6 is only shown for mV linear inputs).

Linear input types allow the mapping of a millivolt value to a configurable display range. The example shown opposite shows how to do this.

-10.00 to +80mV

Default value 80.00