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5391/Pot - RG354699
L5391/Pot - RG354699

Description

This block mimics a potentiometer in a display band on an L5391 operator station.  It has a single output for the setpoint (SP).  Pressing the buttons on the right side of the display changes the setpoint.

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 requires feedback from its output to its Setpoint (SP) input.  This allows clamping of the setpoint and sharing of the setpoint among multiple pots.  (In the simplest case, the pot output may be directly connected to its Setpoint input).

A number of parameters are required to set up the pots display.  Here are some examples:

Example 1:	(This is the sample function block drawing.)  The pot is to display the line speed in feet per minute and 100% setpoint corresponds to 240 feet per minute.  The setpoint cannot be negative. The format string is ###.# FPM and the gain is 2400.

Example 2:	The pot is to display motor speed in RPM and 100% corresponds to 1750 RPM.  The format string is -#### RPM and the gain is 1750.

Example 3:	The pot is to display roll length in meters and 100% setpoint corresponds to 60,000 meters.  The format string is ####0 meters and the gain is 6000.

Parameters

Setpoint	Feedback to the pot.  Expects a value (-100% to +100%).

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

Get Changing	Returns true if one of the pot buttons is being pressed, false otherwise..

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

Format	A format string specifies how the setpoint 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% setpoint; it may range from 10 to 10,000.  Note that decimal point should be ignored when determining gain; its position is specified in the format string.


Description

This block mimics a potentiometer in a display band on an L5391 operator station.  It has a single output for the setpoint (SP).  Pressing the buttons on the right side of the display changes the setpoint.

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 requires feedback from its output to its Setpoint (SP) input.  This allows clamping of the setpoint and sharing of the setpoint among multiple pots.  (In the simplest case, the pot output may be directly connected to its Setpoint input).

A number of parameters are required to set up the pots display.  Here are some examples:

Example 1:	The pot is to display the line speed in feet per minute and 100% setpoint corresponds to 240 feet per minute.  The setpoint cannot be negative. The format string is ###.# FPM and the gain is 2400.

Example 2:	The pot is to display motor speed in RPM and 100% corresponds to 1750 RPM.  The format string is -#### RPM and the gain is 1750.

Example 3:	The pot is to display roll length in meters and 100% setpoint corresponds to 60,000 meters.  The format string is ####0 meters and the gain is 6000.


Parameters

Setpoint	Feedback to the pot.  Expects a value (-100% to +100%).

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

Get Changing	Returns true if one of the pot buttons is being pressed, false otherwise..

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

Format	A format string specifies how the setpoint 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% setpoint; it may range from 10 to 10,000.  Note that decimal point should be ignored when determining gain; its position is specified in the format string.