SAFETY_LATCH(9)

NAME
safety_latch - latch for error signals

SYNOPSIS

loadrt safety_latch [count=N|names=name1[,name2...]]

DESCRIPTION

HAL component that implements a safety latch for error signals with customizable harm, healing and latching features.

When the component is not enabled the error input value is forwarded to output without further modififactions.

If error-in is true the error count is increased by harm. If error-in is false the error count is decreased by heal. When the error count exceeds the threscold value error-out is set to true. If latching is false the error-out pin will only return to false when reset is set to true.

The inputs pin min and max clamp the error count value to a specified range.

FUNCTIONS

safety-latch.N (requires a floating-point thread)

PINS

safety-latch.N.error-in bit in (default: false)
    Error Input

safety-latch.N.heal s32 in (default: 1)
    Heal when ok per tick

safety-latch.N.harm s32 in (default: 1)
    Harm when error per tick

safety-latch.N.latching bit in (default: true)
    If a reset is necessary to heal an error

safety-latch.N.reset bit in (default: false)
    Reset input

safety-latch.N.threshold s32 in (default: 100)
    Error output threshold

safety-latch.N.min s32 in (default: 0)
    Minimum count

safety-latch.N.max s32 in (default: 1000)
    Maximum count

safety-latch.N.enable bit in (default: true)
    If not enabled the error count is passed to the output

safety-latch.N.count s32 out (default: 0)
    Current count

safety-latch.N.error-out bit out (default: false)
    Error output

safety-latch.N.ok-out bit out (default: true)
    Ok output

AUTHOR

Alexander Rössler

LICENSE

GPL