This description is divided into following sections:
- Load Work Orders and PM Occurrences to MPB
- Scheduling Status
- Scheduling Methods
- Scheduling Logic
- Resource Allocation based on Constraints
- Resource Allocation ignoring Constraints
- Resource Allocation with Resource Groups
- Scheduling Critical Work
- Scheduling using Equipment Object Accessibility
- Scheduling Multisite Work Tasks
Maintenance Planning Board (MPB) is mainly about scheduling Work Orders or/and Preventive Maintenance on sites, while assigning or reserving Resources, using a Scheduling client. This only considers the constraints placed by Work Orders/Preventive Maintenance and Resources that are actually loaded to the Maintenance Planning Board at a given time and not all the Work Orders/Preventive Maintenance and Resources available at the site. It also depends on whether the Resources used for the Work Tasks/ PM Work Lists have finite/infinite scheduling capacity. If the IFS/Operational Plan is used scheduling can be performed by considering the equipment object accessibility as well, which is derived from Operational plans. The scheduling process is supported by a graphical representation of Work Order/PM action occurrences, Work Task/Work List, Resources, calendars, etc. This powerful graphical interface allows you to work with the schedule interactively. You can move the Work Tasks/ Work Lists and Resources along a timeline using drag-and-drop and schedule them to meet your requirements. The changes you make can then be saved back to the database and the changed Work Orders and PM actions will be updated accordingly. Note that the data presented in the Maintenance Planning Board is not constantly synchronized with the data in the database. You need to reload data to the Maintenance Planning Board to see the latest data from the database at a given time.
The Maintenance Planning Board solution provides below functionalities:
The following IFS Application components are used for the Maintenance Planning Board solution;
Furthermore, the following solutions are not applicable to be used together with the Maintenance Planning Board solution;
In order to schedule a Work Order/Preventive Maintenance using IFS/Maintenance Planning Board, the Work Order Site must be MPB enabled.
Load Work Orders and PM Occurrences to MPB
Maintenance Planning Board is opened using IFS/Maintenance Planning Board or IFS/Maintenance Planning Board for Planning Network. Work Orders with status Fault Report, Work Request, Observed, Under Preparation, Prepared, Released and Work Started can be loaded into the MPB. However, if these Work Orders contain Work Tasks in Work Done status and above, those Work Tasks are not loaded into the MPB. Furthermore when loading Work Started Work Tasks, it always overrides the Planned Start Date with Actual Start Date and Planned Finish Date with Actual Start Date + Duration inside MPB. Thereby, it will not be possible to Schedule or Unschedule the Work Started Work Tasks inside MPB.
Preventive Maintenance actions with Active status can be loaded into the MPB to schedule Preventive Maintenance occurrences. If IFS/Operational Plan is used, it is possible to load Operational Plans with statuses Active and Under Preparation. You can load sub set of stand-alone Work Orders, Work Order Structures and Preventive Maintenance occurrences based on the required filter criteria on IFS/MPB Load dialog box.
Scheduling inside Maintenance Planning Board provides an optimized schedule to satisfy all constrains, based on scheduling requirements defined on Work Tasks / Work Lists, Resource availability, Material availability and Equipment Object accessibility. Saving back the schedule updates the Planned Start and Finish Dates of the Work Tasks, Work Lists, Work Orders or/and PM action occurrences and updates the Resource allocations for each Work Task or/and Work List. It also updates the scheduling status of Work Task or/and Work List, Work Order or/and PM action occurrences as well.
Set of information defined on Work Task/PM Work Lists/PM action such as Earliest Start/ Fixed Start Date on Work Task and PM action occurrence, resource requirement defined on Resource Demands, Dependencies between Work Tasks/Work Lists are considered as scheduling requirements which must be satisfied when scheduling. Furthermore if IFS/Operational Plan is used, then the information such as Scheduling Inside One Maintenance Window, Scheduling Obstructive Work Tasks/Work Lists are considered as scheduling requirements during certain scheduling scenarios. The Latest Finish Date on Work Task or PM occurrence is considered as scheduling objective that is to be achieved during scheduling. However, if the order can not be scheduled before the Latest Finish Date, it is indicated as a Tardy Work Task/ Work List. Also there are resource constrains defined on Work Task/ Work List i.e. Maintenance Organization, Resource Groups, Resource and Team etc. The resource allocation is done to satisfy this resource constrains as well.
Persons, Person Groups, Tool/Equipment and Tool/Equipment Groups are considered as Resources in Maintenance Planning Board. All the resources that are defined as maintenance resources for the given site is loaded into MPB and represent the resource structure similar to the structure in Resource Navigator. If MPB is loaded for planning network, the resource structure is duplicated for each site if the resource groups are connected to multiple sites. Resources are allocated to Work Task/Work List based on defined constrains on Work Task/Work List and scheduling requirement on Work Order/PM. Maintenance Organization, Person Group, Person and Team are considered as person constraints. The constraint for tool/equipment are Maintenance Organization, Tool Group and Tool ID. However, it is possible to allocate resources breaking constrains by manually dragging resources to the task roles as well.
Resource availability is connected with calendar. Individual person can be connected to a calendar in IFS/Resource Navigator. MPB uses this calendar to decide persons availability. If the person calendar is not available, then the maintenance organization calendar which is the calendar that is connected to person's primary employment is taken for scheduling. For tools, the calendar connected to the tool/equipment is considered and if it is not available maintenance organization calendar which the tool is connected is considered. Resource breaks are also used to define unavailability of resources.
Furthermore, there is an infinite and group resource concept. i.e. person or tool group can be defined as a resource and can be defined with infinite capacity or finite capacity. Then, it will be possible to allocate resource groups as an allocation for task roles. If the resource group has infinite capacity, it is possible to allocate any number of Work Tasks/PM Work Lists on infinite resource groups, at a time.
Part's availability can be defined as Infinite, Finite (within a specific lead time), or Always Finite. Availability of material is considered in MPB, if the material line in the Work Order/PM is connected with a Work Task/Work List and the material is defined as finite or always finite in IFS/Inventory Part. The parts with infinite availability are ignored by MPB. For parts with finite availability, MPB checks for the required amount as it schedules. The required amount can be comprised of an existing supply or from a new supply within the part's lead time. After the part's lead time, MPB assumes the part has infinite availability. For parts that always have finite availability, the required amount needs to be available to schedule a Work Task/ Work List. As MPB schedules, it records the quantity and the date and time at which the material is consumed.
This is applicable only if IFS/Operational Plan is used. Object accessibility is the time plan where the object is not used by any operational activities defined in IFS/Operational Plan. This is derived from Active operational plans connected to the Equipment Object structure and Operational Mode connection between Equipment object and Operational plans. For more information refer Scheduling with equipment object accessibility. Object accessibility is only considered when Scheduling Obstructive Work Tasks/Work Lists in Work Order/PM or when the Work Order/PM action occurrence need to be Scheduled inside one maintenance window. Work Tasks can have different object accessibility based on the connected object to the Work Task. If the Actual Object is available on the Work Task, that object is considered to derive the object accessibility. If the Actual Object is not available, the Reported Object is taken. When all the Tasks of the Work Order needs to be scheduled inside one maintenance window, then the overall object accessibility is derived from accumulation of the object accessibility of all Work Tasks of that Work Order. For PM Work Lists, the object accessibility for Work Task is taken considering the object connected in the PM header.
There are different scheduling statuses for Work Tasks/PM Work Lists inside MPB as well as in IFS/Prepare Work Order or IFS/PM Action. There is no one to one match between statuses, but there is a logical relationship between them.
Inside IFS/Prepare Work Order or IFS/PM Action, a Work Task/PM Work List has scheduling statuses Need Rescheduling, Scheduled and Unscheduled. The status Need Rescheduling is for newly created Work Tasks/PM Work Lists or when there is a modification of data in any Work Task/PM Work List or Work Order/PM which affects on MPB scheduling. If the Work Task/PM Work List has the status Scheduled, then the Work Task/PM Work List is scheduled in MPB and resources and planned dates are allocated. If the Work Task/PM Work List is Unscheduled, this means that there are no enough resources to schedule or any of the scheduling requirements or constrains are not satisfied during MPB scheduling. It also can be due to manual unscheduling of orders.
Work Order/ PM action occurrence level scheduling status could have
Need Rescheduling, Resolved, Unresolved and Unresolved
(Tardy). Need Rescheduling is for newly created Work Order/PM action
occurrences or when there is a modification of data in any Work Task/Work
List or
Work Order/PM which affects on MPB scheduling. Work Order/PM action become
Resolved, if all the Work Tasks/Work Lists are scheduled and met the Latest
Finish Date
of the Work Task/Work List. Unresolved indicates that there are one or more Unscheduled
Work Tasks/Work Lists. Unresolved (Tardy) indicates that all Work Tasks/Work
Lists are scheduled but there are one
or more Tardy Work Tasks/Work Lists which do not meet the Latest Finish Date of the
Work Task/Work List.
Inside MPB, Work Task/Work List can have
Incomplete,
Unscheduled, Resources Assigned, Scheduled,
Firmed Planned, Work Started,
Need Rescheduling and/or
Tardy status. A Work Order/PM action occurrences or Work
Task/Work List can have a
valid combination of these statuses and indicates in show dialog box of each item
with crossed mark. If there are no Work Task/Work List in the Work Order/PM
action occurrences, then none of the statuses are crossed. The statuses can be
described as below;
As and example, if you load new Work Order with Work Task at the status 'New'
and if it has Planned Start and Finish Date
which is defined in the Work Task manually, then MPB loads it while assigning the possible
resources and Work Task is indicated with status combination of Need
rescheduling and Scheduled. Once you reschedule the Work Task then
the Need rescheduling cross mark is cleared and Work Task become Scheduled. If
you drag the work beyond the Latest Finish Date of the Work Task, then the
Work Task gets the combination of Scheduled and Tardy. If you unschedule
the Work Task by maintaining resource assignment, then the Work Task gets the status
Resource
allocated. Work order always get the combined statues of all Work Tasks. In
the save back process, if Work Task does not get a Planned Start/Finish Dates or resource allocation from MPB, then
Work Task in IFS/Prepare
WO, become
Unscheduled in Work Task line. If Work Task gets Planned Start/Finish Dates and
resource allocations from MPB, then Work Task become Scheduled.
There are two different methods of scheduling.
1. Automatic scheduling
Automatic scheduling can be performed on individual Work Task/Work List, Work Order, PM action occurrence or on any collection of Work Order or/and PM action occurrence. It is also possible to perform automatic scheduling on resources, i.e. Persons, Tools or any collection of resources. Automatic scheduling provides three scheduling modes;
- As soon as possible: i.e. to schedule Work Task/Work List closer to the Earliest/Fixed Start Date or present time as much as possible.
- As late as possible: i.e. to schedule Work Task/Work List closer to the Latest Finish Date.
- As late as possible with compress: i.e. to schedule Work Task/Work List closer to the Latest Finish Date and the compress function shifts Work Tasks/Work Lists from right to left, closer to their preceding Work Tasks/Work Lists. This tends to minimize the processing time for an Work Task/Work List.
If project connected stand alone Work Orders are to be scheduled by selecting a project activity, project or a collection of projects, the order start date can be selected as Work Task Earliest/Fixed Start Date, Activity Early Start Date or Activity Late Start Date. Project connection between Work Orders in Work Order Structure is neglected by MPB.
Scheduling of set of object (Work Orders, PMs, Resource Break etc) can be performed on selected actions if it is applicable, i.e.
- Schedule selected unscheduled objects
- Schedule selected scheduled objects
- Schedule selected firm planned objects
- Schedule selected objects that need rescheduling
There are two options for resource assignment when scheduling. i.e. Maintain Resource Assignment and Re-assign Resources. If maintain resource assignment is selected, then the orders are scheduled using assigned resources. If reassigned resources option is selected, then it removes existing data and re-assigned resources based on constrains.
2. Manual Scheduling
Work Tasks/Work Lists, Work Orders/PM action occurrences or resources can be manually scheduled by using Insert and Drag & Drop options.
- Drag and Drop: This can be performed by using Right-click option drag and drop. This action move the Work Order/PM action occurrence, Work Task/Work List where there is available resource capacity to perform the work which satisfy all the constrains and scheduling requirement.
- Insert: This can be performed by using Left-click option drag and drop. This action insert the Work Order/PM action occurrence or Work Task/Work List where you drop it and maintaining the same resources and other orders will be pushed out.
When constructing a schedule, many different steps are taken using different algorithms. First, material availability and resource assignment options are evaluated. Then, the earliest and latest possible start times for all Work Tasks/Work Lists are determined. Based upon a selected priority rule, these time values are used to sort the Work Tasks/Work Lists in the order in which they will be scheduled. The Work Tasks/Work Lists are then scheduled forward with the finite capacity constraints of the materials and resources. After scheduling, there are some optimization techniques that can be chosen. As late as possible scheduling mode moves all Work Tasks/Work Lists as close to their Latest Finish Date as possible. With Compress option moves Work Tasks/Work Lists as close together as possible from left to right. There are some key objectives to accomplish when constructing a schedule by MPB:
Resource Allocation based on Constraints
Selection of allocations are done based on the defined constraint on the
Work Task/Work List and on demand lines. Resource also should belong
to the maintenance organization site mentioned in the Work Task/Work List.
Resource
Constraints used for Resource selection
Person Maint. Org on Task, Team on Task,
Person Group on Demand line, Person on Demand line If a person resource is assigned on a task role, it should satisfy
all above constrains, i.e. person should belong to the mentioned Maint
Org, team, person group and if the person ID is mentioned in the task
demand, then the same person should be allocated who does satisfy other
constraints as well. Maint. Org on Task, Tool
Group on Demand line, Tool ID on Demand line Similar to the person, allocated tool resource should satisfy all
above three constraints
Person
Group When allocating a person group as a
resource, it should be the same resource group mentioned in the demand
line or subgroup of the mentioned resource group in the demand line.
Tool Group Similar to the person group, when
allocating a tool group as a resource, it should be the same resource
group mentioned in the demand line or subgroup of the mentioned resource
group in the demand line.
Tool
Person Group on Demand line
Tool Group on Demand line
Resource Allocation ignoring Constraints
It is also possible to allocate resources ignoring constraints. A resource which does not satisfy above constraints can be manually dragged and drop in to a role of Work Task/Work List item. If the task is automatically scheduled selecting 'Maintain Resource Assignments' then MPB schedule the Work Task/Work List maintaining the same assigned resource. This is applicable for all resource types, i.e. Person, Person group, Tool, Tool group.
Resource Allocation with Resource Groups
Resource groups are loaded and displayed; in MPB as a structure which is defined in Resource Navigator. Person group or Tool group is considered as a resource inside MPB, if it is selected for Use as Resource. Resource group can have a scheduling capacity and a calendar. If the Infinite flag is selected, then it is possible to allocate any number of Work Tasks/Work Lists on to that resource group.
A Work Task/Work List is considered as critical work based on the work type, criticality of equipment object connected to the Wok Task/PM action and the priority on Work Task/PM action. Critical work basic data need to be defined in IFS/Work Order PM Basic Data window. Inside MPB, there is a special way of handling Critical Work Tasks and Work Lists
If a Critical Work Task/Work List become tardy, then during the save back, MPB act as below based on the basic data setup defined in 'Save Tardy Critical Work' in IFS/Maintenance Planning Board Basic data setup;
- Work Order/PM occurrence's schedule does not save back to database and information message is displayed or
- Work Order/PM occurrence's schedule is saved back with a warning message or
- Work Order/PM occurrence's schedule is saved back without a warning
Scheduling using Equipment Object Accessibility
In certain scenarios, some maintenances are not possible to perform during the equipment object is used for its productive operational activities. Equipment object accessibility in MPB is the time plan where the Object is not involved with its operational activities. If IFS/Operational Plan is used, then there is a possibility to define operational plans for the equipment object structure in IFS/Operational Plan. Operational Modes are used to derive object accessibility against the operational plan. Operational Modes can be defined in IFS/WO PM Basic Data and can be connected to individual equipment objects and operational plan items in the Operational plan. MPB loads all active operational plans which is connected to equipment object structure, if there are any Work Task/ Preventive Maintenance connected to an object in the object structure is/are loaded to MPB. In MPB, object inaccessible time is derived using the operational plan and operational mode.
As an example, in the below diagram object structure is connected to the
operational plan X. Object A is connected to operational mode 1 and 2,
while the Object B is connected to operational mode 3 and 4. Operational plan
items in the Operational plan X are connected with Operational mode 1,2,3 and 4. MBP derives the time plan where the object is in use by operational activities
using operational modes as below. There, the Object A is used for operational
activities during Jan.2016 and Feb.2016 while it is available for maintenance
activities from March.2016 onwards and obstructive work tasks of the Work Orders/PMs belong to this object can only be scheduled during this period.
Similarly, Object B is available of maintenance during Jan.2016, Feb.2016 and
April.2016 while it is in operation during March.2016 and May.2016.
Equipment Object accessibility is involved in different scenarios.
Scheduling Obstructive is a derived value from Safe Access value on the Equipment Object together with the Operational Status Type on the Work Task/Work List line. Example: If Safe Access is Required and Operational Status Type is Not Obstructive on the Work Task/Work List, this value is derived as Obstructive. In all other cases this value follows the Operational Status Type-value defined on the work task. During the scheduling, scheduling obstructive Work Task/Work List in Work Order/PM cannot be scheduled in a time period where the object connected in Work Task/ PM is in use by an operational activity in operational plan. The Work Order/PM Work Task/Work List that are not scheduling obstructive can be scheduled any time period satisfying other scheduling requirements and constrains.
The option Scheduling Inside one maintenance window can be set on IFS/Prepare WO/MPB Scheduling or/and IFS/PM action/General tab. If the Work Order/PM is selected for Scheduling Inside one maintenance window, then all the Work Tasks/Work Lists in Work Order/PM will be scheduled in a continuous time period where the object is not in use by an operational plan item. There will be no operational activities in between Work Order/PM Work List.
Scheduling Multisite Work Tasks
Work order can have Work Tasks for different Work Task sites and different maintenance organization sites. These Work Orders are handled in MPB as below;
- MPB loads all the Work Tasks inside the Work Order even if the task site is different to the WO site.
- When scheduling, it always considers the Work Task's Maint. Org site to assign resources, i.e. resources are selected from the Maint Org site of the Work Task.
- If the Maint org site of the Work Task is different than the MPB WO site, then these tasks are considered as incomplete and will not be scheduled inside MPB. However, if MPB for Planning Network is used, then if the Maint Org site is included in the planning network, the Work Task is scheduled by MPB assigning resources from Work Task's Maint Org Site.
When using MPB single site solution, MPB does not load the Work Order Structure, if it has Work Orders from other sites and it does not allow to continue schedule for that site. However, by using MPB for Planning Network, it is possible to load and schedule Work Order Structures from multiple sites.
The planned dates of the Work Task/Work List item, scheduling status change, and resource allocations are considered as scheduled result. The schedule of Work Orders and PM action occurrences can be save to the database. The Work Order and PM action information will be updated. Allocations for each PM action occurrence will be saved and can be visualized in PM Action/Jobs and Work List dialog.
If a Work Task or PM action occurrence which is defined as Critical work become tardy in MPB scheduling, then it is indicated with red color label in the bottom of the window. However, there is a basic data setup to control saving back a tardy schedule on database. It can be set up in IFS/Scheduling basic data. It is possible to set to give an error, warning or allow saving by ignoring the tardy critical work. In Work Orders, if any of the Critical Work Task is tardy then the defined conditions are applicable for the whole Work Order, i.e. in basic data, if it is defined to give and error for tardy Work Order, then if at least one Critical Work Task is tardy, then schedule is not saved back for the whole Work Order.
For Work orders, if individual resources are assigned for Work Tasks, then the Work Assignments are created for each allocation. If group allocations are created, then a work assignment is not created, but it is updated in the background and when MPB is reloaded, then group allocation information will be available. For PM Actions, Work Assignments are not created, but allocations are visible in PM Action/Jobs and Work List dialog.
If Copy Schedule/Planned dates checkbox on Site window is selected then, during the WO generation of PM action, the schedule is transferred to the respective Work Order and Work Assignments are created for the individual resource allocations. Therefore you do not need to plan PM generated Work Orders, if they are already scheduled in MPB as a PM action occurrence. However, if grouped Work Tasks are created during WO generation, then the schedule of the task is copied but the WO scheduling status is set as Need Rescheduling. If the merged tasks are created during the WO generation, then the schedule is not copied at all.
Upon saving back the schedule, corresponding material requisition's requested date is also updated.