Man page - classicladder(9)

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Package: linuxcnc-uspace
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Manual

CLASSICLADDER

NAME
SYNOPSIS
DESCRIPTION
PINS
PARAMETERS
FUNCTIONS
BUGS
SEE ALSO

NAME

ClassicLadder - realtime software plc based on ladder logic

SYNOPSIS

loadrt classicladder_rt [numRungs= N ] [numBits= N ] [numWords= N ] [numTimers= N ] [numMonostables= N ] [numCounters= N ] [numPhysInputs= N ] [numPhysOutputs= N ] [numArithmExpr= N ] [numSections= N ] [numSymbols= N ] [numS32in= N ] [numS32out= N ] [numFloatIn= N ] [numFloatOut= N ]

loadusr classicladder <file name> [--nogui]

DESCRIPTION

This component consist of a realtime part and a non-realtime part. The non-realtime part loads the programmable ladder description, while the realtime part provides the pins. The file name of the configuration can be changed using an argument to the non-realtime part. By default the non-realtime part provides a graphical visualisation of the loaded ladder, which can be disabled using the ’--nogui’ option to the non-realtime part.

These pins and parameters are created by the realtime classicladder_rt module. Each period (minimum 1000000 ns), ClassicLadder reads the inputs, evaluates the ladder logic defined in the GUI, and then writes the outputs.

PINS

classicladder.0.in- NN IN bit

These bit signal pins map to %I NN variables in ClassicLadder.

classicladder.0.out- NN OUT bit

These bit signal pins map to %Q NN variables in ClassicLadder. Output from ClassicLadder.

classicladder.0.s32in- NN IN s32

Integer input from ClassicLadder. These s32 signal pins map to %IW NN variables in ClassicLadder.

classicladder.0.s32out- NN OUT s32

Integer output from ClassicLadder. These s32 signal pins map to %QW NN variables in ClassicLadder.

classicladder.0.floatin- NN IN float

Integer input from ClassicLadder. These float signal pins map to %IF NN variables in ClassicLadder. These are truncated to S32 values internally. eg 7.5 will be 7.

classicladder.0.floatout- NN OUT float

Float output from ClassicLadder. These float signal pins map to %QF NN variables in ClassicLadder.

classicladder.0.hide_gui IN bit

This bit pin hides the ClassicLadder window, while still having the non-realtime code run. This is usually desirable when modbus is used, as modbus requires the non-realtime code to run.

PARAMETERS

classicladder.0.refresh.time RO s32

Tells you how long the last refresh took.

classicladder.0.refresh.tmax RW s32

Tells you how long the longest refresh took.

classicladder.0.ladder-state RO s32

Tells you if the program is running or not

FUNCTIONS

classicladder.0.refresh FP

The rung update rate. Add this to the servo thread. You can added it to a faster thread but it. Will update no faster than once every 1 millisecond (1000000 ns).

BUGS

See http://wiki.linuxcnc.org/cgi-bin/wiki.pl?ClassicLadder_Ver_7.124 for the latest.