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Chapter 7. openETCS Meta Model
their name:
• oAND, oOR, oXOR, and oNOT provide Boolean operations.
• oSum, oSubstraction, oDivision, and oMultiplication provide arithmetical
calculations.
• oDoubleEqual, oIntEqual, oStringEqual, oDoubleGreater, oDoubleGreaterOrEqual,
and oIntGreater compare data flows of the corresponding
types.
Nevertheless, there exist also some object types which functionality must be
explained more accurate:
oDoubleArrayAcessor accesses a certain element of a double array input by
using an integer input as index. The element is used as double output.
oBoolGate controls a Boolean data flow by using another Boolean input. If
this control input is true, then the Boolean input is directly transferred
to the output, else nothing is output. This is the same functionality of
inhibit gates elements in Fault Tree Analysis [78, pp. 43-50].
oDoubleGate provides the same functionality as oBoolGate but for double
data flows.
oStringGate provides the same functionality as oBoolGate but for string
data flows.
oBoolSwitch is similar to oBoolGate, but instead of only copying or not
output at all it switches between two Boolean inputs. If the Boolean
control input is true, the first Boolean input is transferred to the output,
else the second input is transferred.
oDoubleSwitch has the same functionality as oBoolSwitch but for double
data flows.
oStringSwitch has the same functionality as oBoolSwitch but for string data
flows.
oEmbeddedStateMachine is used to define control flows by a decomposition
to a gEmbeddedStateMachine graph. It has one Boolean input to start
the underlying control flow. The string output delivers the literal name
of the current active state if the control was started and did not finish
yet.
oBrakingToTargetSpeed defines the calculation of a braking-curve for a
certain target speed as double input. It uses the gradient distance and
gradient values of the track as double array input. The current speed
and distance, the distance to the new speed limit, the new speed limit,
and the adhesion factor for the track are taken as double inputs. It
provides a Boolean output for the emergency brakes and a double output
for the service brakes. Additionally, it has Boolean outputs to inform
about exceeded speed limit and applied service and emergency brakes.
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