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Line Drive/Loadcell PID - RG354173

Description

This block computes a PID for Loadcell inputs.  It has two outputs.

Feedback is calculated from loadcell inputs (Loadcell 1 and Loadcell 2) trimmed by the Zero, Sign and Span inputs. Output is the PID output calculated using Feedback as the input to the PID.

Please refer to the SignalP/PID function block data sheet for information on the PID function within this block.

Although all of the inputs may be connected to other function blocks in the system, a new output is computed only when the Loadcell 1 input receives a message.  Furthermore, the Loadcell 1 input should receive messages on a regular basis (the PID is designed to tolerate timing jitter but should not be left without a feedback input for long periods).

Parameters

Loadcell 1	I/P input #1, triggers function block (see Feedback in SignalP: PID).  Expects a value (-100% to +100%).

Zero 1	Zero offset for Loadcell 1.  Expects a value (-100% to +100%).

Sign 1	Sign for Loadcell 1.  Expects a value (-100% to +100%).

Loadcell 2	I/P input #2.  Expects a value (-100% to +100%).

Zero 2	Zero offset for Loadcell 1.  Expects a value (-100% to +100%).

Sign 2	Sign for Loadcell 2.  Expects a value (-100% to +100%).

Span	Scaling for Loadcells.  Expects a value (-10 to 10).

Get Loadcell 1	Returns the current value of Loadcell 1:  -100% to +100%.

Get Zero 1	Returns the current value of Zero 1:  -100% to +100%.

Get Sign 1	Returns the current value of Sign 1:  -100% to +100%.

Get Loadcell 2	Returns the current value of Loadcell 2:  -100% to +100%.

Get Zero 2	Returns the current value of Zero 2:  -100% to +100%.

Get Sign 2	Returns the current value of Sign 2:  -100% to +100%.

Get Span	Returns the current value of Span:  -10 to 10.

Get Feedback	Returns the current value of Feedback:  -100% to +100%.


Description

This block computes a PID for Loadcell inputs.  It has two outputs.

Feedback is calculated from loadcell inputs (Loadcell 1 and Loadcell 2) trimmed by the Zero, Sign and Span inputs. Output is the PID output calculated using Feedback as the input to the PID.

Please refer to the SignalP/PID function block data sheet for information on the PID function within this block.

Although all of the inputs may be connected to other function blocks in the system, a new output is computed only when the Loadcell 1 input receives a message.  Furthermore, the Loadcell 1 input should receive messages on a regular basis (the PID is designed to tolerate timing jitter but should not be left without a feedback input for long periods).


Parameters

Loadcell 1	I/P input #1, triggers function block (see Feedback in SignalP: PID).  Expects a value (-100% to +100%).

Zero 1	Zero offset for Loadcell 1.  Expects a value (-100% to +100%).

Sign 1	Sign for Loadcell 1.  Expects a value (-100% to +100%).

Loadcell 2	I/P input #2.  Expects a value (-100% to +100%).

Zero 2	Zero offset for Loadcell 1.  Expects a value (-100% to +100%).

Sign 2	Sign for Loadcell 2.  Expects a value (-100% to +100%).

Span	Scaling for Loadcells.  Expects a value (-10 to 10).

Get Loadcell 1	Returns the current value of Loadcell 1:  -100% to +100%.

Get Zero 1	Returns the current value of Zero 1:  -100% to +100%.

Get Sign 1	Returns the current value of Sign 1:  -100% to +100%.

Get Loadcell 2	Returns the current value of Loadcell 2:  -100% to +100%.

Get Zero 2	Returns the current value of Zero 2:  -100% to +100%.

Get Sign 2	Returns the current value of Sign 2:  -100% to +100%.

Get Span	Returns the current value of Span:  -10 to 10.

Get Feedback	Returns the current value of Feedback:  -100% to +100%.