A Grafcet transition condition.

 If the transition condition (see below) is satisfied,
 and every step object (i.e. an object by the type Step,
 InitStep, or SubStep) directly connected to the input
 of the Trans object is active, the active status will
 be transferred to all the step objects directly
 connected to the output of the Trans object, while the
 earlier active step objects become inactive.

 The possible transition conditions are as follows:

 1  an underlying conditional window. The objects in the
    window get a WindowCond object (see p. 3-394) as
    parent object. The status of the conditional window
    is stored in the Trans object by means of a SetCond
    object in the window.

 2  directly in a combinational circuit connected to the
    left horizontal part of the symbol (see T4 in figure
    3-55 on p. 3-366).

 3  the condition is set as always TRUE ( Cond = 1 ) or
    always FALSE ( Cond = 0 ) at the configuring.

 To the vertical line of the symbol step objects are
 connected. When status is transferred it is always from
 the step/s/ that precede the Trans object to the
 step/s/ that follow the Trans object.

 The operator gets the opportunity to control the
 transition condition manually by setting Man = 1. The
 conditional window is being executed as usual, but the
 operator can override the transition condition by
 setting OpCond. As soon as a manually initiated
 transition has taken place the OpCond flag is cleared
 by the ProviewR system which implies that the operator
 has to set the OpCond flag to trigger each transition.
 The Man flag remains set until cleared by the operator.
 At reset of a sequential chain ( see the description of
 InitStep, are neither the Man flag nor the
 OpCond flag is cleared.

 Transition Condition with Different Types of Conditions.
 Parallel Sequences

 In figure Transition Condition with Different Types of
 Conditions. Parallel Sequences the thick vertical lines
 indicate that the transition conditions T5, T6, and T7
 have underlying conditional windows. The transition
 condition T4 has its transition condition directly
 accessible.

 Specifies the conditional status. The condition is set
 in one of the following ways:
   · a SetCond object in an underlying conditional
     window

   · a direct connection to the transition

 Saves the status of preceding steps. Used to limit the
 maximum of transitions to one per sequential chain and
 executing cycle.

 Specifies whether to enable or disable a manually
 initiated transition. FALSE disables a manually
 initiated transition and TRUE enables it.

 Specifies the status of the manual condition. The
 transition takes place when OpCond and Man both are
 TRUE. The OpCond flag is cleared by the ProviewR
 system after the transition.

 The operator's authorities to initiate a transition
 manually.
  0   -- Changes not allowed.
  != 0 -- Changes allowed.