| Offsetting Line Station OrdersAn assembly order consists of several LSOs. These LSOs are
linked to line stations that are grouped in line segments. These orders and
segments all have their own start times and end times. These times are
calculated on the following occasions: - An assembly order is
offset when you plan the order, that is, when LAC creates the assembly order in
ASC.
- A line segment is offset
when you confirm a line sequence in the Simulate and Create Line Sequences (tiasl4200m000) session.
- An LSO is offset in two
instances:
- When you plan the assembly order.
- When you run the current session. This last instance is, of
course, what we focus on now.
If you offset LSOs in the current session, the calculation
depends on the status of the assembly orders. These statuses are: - Planned. If you only
planned an assembly order, and you did not yet confirm a line sequence, the
assembly order has the Planned status.
- Sequenced. After you
confirm a line sequence, the assembly order has the Sequenced status.
According to these statuses, offsetting is based on the
following information: - For Planned assembly orders,
the calculation is based on the lead-time of the line segments, as defined in
the Line Segments (tiasl1540m000) session.
- For Sequenced assembly
orders, the calculation is based on the sequence, assembly line calendar, and
the assembly assignments of the assembly line.
The previous information implies that the start times and end
times of LSOs can vary, according to the offset method that is used. Therefore,
an LSO can have start times and end times on one of the following three levels: - If the LSOs of a Planned assembly order are
not yet offset in the current session, they have the start times and end times
of the assembly order. Of course these values are initial values that cannot be
calculated in the current session.
- If you offset LSOs for
assembly orders with the Planned status, these LSOs get the same start times and
end times as the line segments. This is because the start times and end times
of the LSOs are calculated, based on the lead-times of the line
segments.
- If you offset LSOs for
assembly orders with the Sequenced status, these LSOs receive the start times and
end times of the line stations.
To offset LSOs in the current session, you must specify a
range, an Offline Date To, and
the order type for which the LSOs must be offset. However, not all assembly
orders that match these criteria are offset, but only those assembly orders
that require offsetting. Assembly orders that require offsetting have the
Offsetting Required check box selected. This check box is displayed in the
following sessions: - For Planned orders, in the Assembly Order (tiasc2100s000) session, on
the General tab. If the Assembly Order Status is not Planned, the Offsetting Required check box is not displayed.
- For Sequenced orders, in the Line Segment - Line Sequence (tiasl4500m000) session.
Offsetting is required as soon as a change in the dates or
times of an order occurs, or, in other words, as soon as the actual dates and
times no longer match the planned dates and times. The Offsetting Required
check box, therefore, is selected in the following instances: - When LAC generates the
assembly order in ASC.
- If you mix or manually
move planned orders and, as a result, these orders receive another offline
date/time.
- If you offset the LSOs
of a parent order and as a result, this order receives another offline
date/time, the check box is selected for the child orders; because the child
orders must be synchronized with the parent order. Note that offsetting the
LSOs of a parent order does not result in new start times and end times for the
LSOs of the child orders. The LSOs of the child orders must be offset
themselves too.
- If you confirm a line
sequence, in the Simulate and Create Line Sequences (tiasl4200m000) session, or manually change a confirmed line sequence,
the line segments receive new start times and end times. As a result,
offsetting is required for the LSOs. If the order has child orders, the check
box is selected for the child orders too; because the child orders must be
synchronized with the parent order.
Note that in all these
instances, it is necessary to offset the LSOs of the orders in question, using
the current session. The error messages for offsetting can be viewed in the Assembly Messages (tiasc0501m000) session. | |