Copyright: Created with EasyHelp (Tel: 0973 209667)


L5391/Pot & Meter - RG354696

Description

This block mimics both a potentiometer and a meter in a single display band on an L5391 operator station.  It has an output for the setpoint (SP).

The pot & meter may exist in either the pot mode or the meter mode.  Switching between the two modes is accomplished by pressing the left side of the display.  In the meter mode, the digital part of the display indicates measured value (MV), the upper pointer indicates setpoint and the lower pointer indicates measured value.  In the pot mode, the digital part of the display indicates setpoint; pressing the buttons on the right side of the display changes the setpoint output.

In order to be displayed, this function block must be specified in either a page handler or display handler function block.

Note that a Pot & Meter requires feedback from its output to its Setpoint input.  This allows clamping of the setpoint and sharing of the setpoint among multiple pots.  (In the simplest case, the output may be directly connected to the Setpoint input).

A number of parameters are required to set up the display.  See L5391/Pot and L5391/Meter data sheets for more details.

Parameters

Measured Value	Measured value input to the pot & meter.  Expects a value (-100% to +100%).

Get Measured Value	Returns the current measured value:  -100% to +100%.

Setpoint	Setpoint feedback to the pot & meter.  Expects a value (-100% to +100%).

Get Setpoint	Returns the current setpoint:  -100% to +100%.

Legend	A string of up to approximately 16 characters may be specified for the legend.

Format	A format string specifies how the measured value will be displayed in the digital readout part of the display.  This is done through the use of special characters.

# is used to indicate a digit position.

- is used to indicate the position of the sign.

. is used to indicate the position of the decimal point.

Other than these special characters, the string may contain unit legends, etc.  Up to five digits may be specified and the decimal may be placed anywhere within them (or omitted).

Gain	This defines the on-display representation of 100% measured value; it may range from 10 to 10 000.  Note that the decimal should be ignored when determining gain; its position is specified in the format string.

Display max	This defines the maximum measured value that may be displayed on the analog mimic part of the display.  (-100% to +100%).

Display min	This defines the minimum measured value that may be displayed on the analog mimic part of the display.  (-100% to +100%).

High redline	This is equivalent to the redline on conventional meters.  If the measured value exceeds the high limit, the display pointer is highlighted.  (-100% to +100%).

Low redline	This is equivalent to the redline on conventional meters.  If the measured value falls below the high limit, the display pointer is highlighted.  (-100% to +100%).


Description

This block mimics both a potentiometer and a meter in a single display band on an L5391 operator station.  It has an output for the setpoint (SP).

The pot & meter may exist in either the pot mode or the meter mode.  Switching between the two modes is accomplished by pressing the left side of the display.  In the meter mode, the digital part of the display indicates measured value (MV), the upper pointer indicates setpoint and the lower pointer indicates measured value.  In the pot mode, the digital part of the display indicates setpoint; pressing the buttons on the right side of the display changes the setpoint output.

In order to be displayed, this function block must be specified in either a page handler or display handler function block.

Note that a Pot & Meter requires feedback from its output to its Setpoint input.  This allows clamping of the setpoint and sharing of the setpoint among multiple pots.  (In the simplest case, the output may be directly connected to the Setpoint input).

A number of parameters are required to set up the display.  See L5391/Pot and L5391/Meter data sheets for more details.


Parameters

Measured Value	Measured value input to the pot & meter.  Expects a value (-100% to +100%).

Get Measured Value	Returns the current measured value:  -100% to +100%.

Setpoint	Setpoint feedback to the pot & meter.  Expects a value (-100% to +100%).

Get Setpoint	Returns the current setpoint:  -100% to +100%.

Legend	A string of up to approximately 16 characters may be specified for the legend.

Format	A format string specifies how the measured value will be displayed in the digital readout part of the display.  This is done through the use of special characters.

# is used to indicate a digit position.

- is used to indicate the position of the sign.

. is used to indicate the position of the decimal point.

Other than these special characters, the string may contain unit legends, etc.  Up to five digits may be specified and the decimal may be placed anywhere within them (or omitted).

Gain	This defines the on-display representation of 100% measured value; it may range from 10 to 10 000.  Note that the decimal should be ignored when determining gain; its position is specified in the format string.

Display max	This defines the maximum measured value that may be displayed on the analog mimic part of the display.  (-100% to +100%).

Display min	This defines the minimum measured value that may be displayed on the analog mimic part of the display.  (-100% to +100%).

High redline	This is equivalent to the redline on conventional meters.  If the measured value exceeds the high limit, the display pointer is highlighted.  (-100% to +100%).

Low redline	This is equivalent to the redline on conventional meters.  If the measured value falls below the high limit, the display pointer is highlighted.  (-100%