FlexLink YOUTILIZE - Manual (Page 90)

Providing production efficiency
Page 90 of 125
time. The designation of a machine state as operating time or not is achieved in the OEE
Configuration tab within the iMonitor Settings of iMonitor Express.
If no machine state information is recorded within the planned production time window the last
known machine state value shall be used. If no machine state information has ever been recorded
for the process point then the operating time shall equal the planned production time window.
Within iMonitor (but not iMonitor Express) it is possible for Operating Time to be determined using
reason code information instead of machine state information. A reason code is assigned to a
machine state record by an operator. As a result every time a new machine state is recorded an
operator needs to assign a reason code (through the UI) before that change in machine state can be
used in the determination of operating time. Consider the situation where a machine state is
recorded and the operator assigns a reason code that is not considered operating time. From the
time associated with that machine state record forward no further changes in machine state have
had a reason code assigned. All time from the last machine state record with a reason code forward
will be treated as operating time, or not, depending on whether the reason code is considered
operating time or not. As a result, reason codes, being historical in nature, are not recommended
when using dashboards to display OEE information.
For a factory line, it is the same calculation as above for all process points in the factory line. The
lowest process point availability is returned.
Example
If time frame is 1 hour
Machine 1:
15 minutes down = 45 minutes / 60 minutes = 0.75 (75%)
Machine 2: no down time = 60 minutes / 60 minutes = 1.00 (100%)
Machine 3: 20 minutes off = 40 minutes / 60 minutes = 0.67 (67%)
Availability = Machine 3 (lowest availability) = 67%
OEE Performance (Overall Equipment Effectiveness) Gauge and
Indicator
Filters Supported – Factory Line/Process Point
Performance is calculated as Ideal Cycle Time / (Operating Time / Total Pieces).
The Ideal Cycle Time for each process point is recorded in the OEE Configuration tab within the
iMonitor Settings of iMonitor Express and does not change (unless modified by an operator).
The operating time is calculated as described in section Error! Reference source not found..
Total Pieces is calculated by counting up the number of WIP transactions recorded during the
planned production time, where planned production time is calculated as described in section Error!
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It can be seen that if availability is an issue it may be easier to get a high performance figure because
total pieces is determined across the whole planned production window, and not just the operating
window. This is an integral part of OEE design which is designed so as to put the focus on availability
in that situation.
Example