CAROUSEL

NAME
SYNOPSIS
DESCRIPTION
FUNCTIONS
PINS
PARAMETERS
AUTHOR
LICENSE

NAME

carousel − Orient a toolchanger carousel using various encoding schemes

SYNOPSIS

loadrt carousel pockets=N[,N] encoding=ssss[,sss] num_sense=N[,N] dir=N[,N]

pockets The number of pockets in each toolchanger.

Use up to 8 numbers separated by commas to create multiple carousel components.

encoding The position encoding.

gray, binary, bcd, index or single. Default = ’gray’

num_sense The number of position sense pins.

Default = 4.

dir Set to 1 for unidirectional or 2 for bidirectional operation.

Default = bidirectional parity Set to 1 for odd parity, 0 for even parity checking. Default = 0 (even)

DESCRIPTION

This component is intended to help operate various types of carousel-type toolchangers. The component can be configured to operate with binary, binary-coded decimal (BCD) or gray-coded position feedback, with an individual sensor for each tool position or with a sensor at each tool position and a separate index.

At the moment it is best-suited to Geneva-mechanism type systems where the motor is either on or off. Both unidirectional and bidirectional systems are supported.

The number of carousel component instances created depends on the number of entries in the ’pockets’ modparam. For example

loadrt carousel pockets=10,10,8

Would create 3 carousel instances with 10, 10 and 8 pockets. The other parameters are optional. If absent then defaults will be used. Any missing entry will assume the previous value.

When the enable pin is set to true the component will immediately set the "active" pin to true and then (for a bidirectional instance) calculate the shortest path to the requested pocket number. The appropriate motor direction output pin will then be set.

The component will monitor the carousel position and, when the correct position is reached, set the motor-control pins to 0, set "active" to 0 and set "ready" to 1.

In index mode the behaviour is slightly different. The first time that the "enable" pin is set; the carousel will rotate forwards until both the index and pulse inputs are true. If there is no pulse line at the index position then a HAL "or2" function can be used to allow the index sensor to toggle both inputs. Setting "enable" low does not halt the homing move, so if homing on first tool change is not needed then the enable pin can be toggled by an axis homing pin or a script.

FUNCTIONS

carousel.N

PINS

carousel.N.pocket-number

s32 in The pocket to move to when the .enable pin goes high. If the value passed is gigher than the number of pockests specified in the "pockets" modparam then modulo arithmetic is used. This is intended to allow the use of multiple tools in the same holder, as is sometimes useful with lathes.

carousel.N.enable

bit in Set this pin high to start movement. Setting it low will stop movement

carousel.N.active

bit out indicates that the component is active

carousel.N.ready

bit out This pin goes high when the carousel is in-position

carousel.N.strobe

bit in (default: 1) Use this pin to indicate that the position feedback is valid. Often provided by binary encoders

carousel.N.parity

bit in Some encoders supply a parity bit, if this is connected then the parity-error output bit will indicate parity errors

carousel.N.sense-M

bit in
(M=0..personality) Carousel position feedback pins. In ’index’ mode there will be only 2 pins. sense-0 is the index and sense-1 is the pocket sensor.

carousel.N.jog-fwd

bit in Jog the carousel forwards one tool position

carousel.N.jog-rev

bit in Jog the carousel in reverse (only if dir = 2). It is very important that these pins should be debounced and should probably also be interlocked to only operate when the machine is idle.

carousel.N.motor-fwd

bit out Indicates the motor should run forwards (bigger numbers)

carousel.N.motor-rev

bit out Indicates the motor should run reverse.

carousel.N.parity-error

bit out Indicates a parity error

carousel.N.current-position

s32 out This pin indicates the current position feedback

PARAMETERS

carousel.N.state

s32 r (default: 0) Current component state

carousel.N.homing

bit r (default: 0) Shows that homing is in progress. Only used for index mode

carousel.N.homed

bit r (default: 0) Shows that homing is complete. Only used in index mode

AUTHOR

andy pugh

LICENSE

GPL