RPM Indicator — Robotics/Flight Instruments

RPM Indicator

Robotics / Flight Instruments

An engine-speed dial, in percent. It shows the value of a signal it is told the name of on a fixed scale from 0 to 110, turned in proportion over 330° clockwise from twelve o'clock and pegged 5° past either end outside it, with coloured bands on the scale. It has no ports at all.

Ports

• None. Not one input, not one output: the dial reads the signal it is bound to by name, as Simulink's binds to the one selected on its canvas.

Parameters

• Signal – the name of the link to read, for example rpm, or its full path when the name contains /. Matching runs over this block's own subsystem and everything below it. It names a link, not a variable, so it is never looked up in the variables space. A name that matches no link is reported when the run starts, and the dial then shows no value. Only the first entry of the signal is read.
• Band Limits – one row per colour band, [min max] per row, default [0 100; 100 105; 105 110], Simulink's own three. A band is drawn clamped to the 0–110 scale; empty means no bands.
• Band Colors – one RGB row per band, components 0–255, default green, yellow and red ([76 187 23; 252 209 22; 227 23 13]). It must have exactly as many rows as Band Limits.
• Refresh Period (s) – how often the dial is repainted, in wall-clock seconds, so a fast run does not turn the face into a blur. Zero or less repaints on every sample; the final sample of a run is always shown.
• Sampling Time (s) – how often the value is read. Zero or less inherits the solver's rate.

How a band is chosen

A band matches when min ≤ value ≤ max, and the FIRST matching row wins, so 100 is green with the default bands. The band index is what the exported code reports.

Notes

• The value is one sample behind. A block with no inputs has no input dependency, so it runs at the head of every step and reads what its source published on the previous one.
• Stateless: it draws, and computes nothing a later step reads.
• The scale is fixed at 0–110: Simulink's RPM Indicator has no limits to set.

Code export

All ten targets: Python, MATLAB, Java, Rust, C, C++, VHDL, Verilog, SystemVerilog and PLC Structured Text. A deployable target has no dial, so each one prints the bound VALUE and the BAND it falls in (0-based, -1 for none), as the Dashboard Gauge does. PLC Structured Text emits comments only, naming the signal array entry to tap. The one-sample shift applies to the exported code too.

Code-export verification

This block is excluded from the code-export verification matrix, by name: the verifier records a terminal block's input signals, and a block with no inputs records nothing, so a rig around it would fail all ten languages at residual 0 and say nothing about the block.

Simulink bridge

None, and that is a measurement. Simulink's RPM Indicator (aerolibhmi/RPM Indicator, BlockType=RPMIndicatorBlock) has ZERO ports of any kind and no SampleTime, measured on R2026a; it reaches its signal through Binding, a canvas selection stored outside the block's parameters, and ICore has no counterpart for that. This block is the ICore reading of it – the signal is named rather than clicked – so it is reported on exchange rather than mapped.