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188
Apparatus control
Normally, only one operator place is valid at a time. But the user can define that more
than one operator place is valid at the same time.
The remote operator place is assigned by the station operator. When local operator place
is deactivated (by the local operator) previous operator place becomes valid.
When the operator place is established, a selection of the apparatus can be made. This
is possible in two different ways only, depending on the select/execute principle. Either
there is one (close or open) selection input set, followed by simultaneous setting of the
execute inputs.
Or if the other principle is used, setting of both selection inputs (close and open select)
simultaneously followed by the direction (close or open) on the execute input. Any oth-
er combination causes a reset of the operation.
Because both select/execute principles are supported from the operator point of view,
two selection and two execute inputs are implemented.
To inform operator(s) at the station HMI that the apparatus is selected from another op-
erator place, there are indications for each apparatus from which operator place (remote,
station or local) it is selected. This is to inform that the apparatus is already selected; so
a selection from that operator place is not possible.
When a selection is made, the apparatus control goes back into idle state for one of these
reasons:
•
After a successful operation
•
No open or close command within specified time
•
When reservation failed
•
When an interlock occurred
•
In blocking state
•
Cancelling of the operation
When the apparatus is in idle state, it is possible to make a new selection from the valid
operator place.
The operator can override the interlocking and/or the reservation from the station HMI
and from the local operator place.
Of course arbitrary orders can be sent to the control terminal, but only orders involved
with the apparatus control are described below.
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