The NMpsCell object is a container for data objects.

 The cell contains a number of positions to store references to data objects.
 The positions are numbered from 1. Every position contains a pointer to
 the data object, objid for the object, two boolean that marks if the rear
 or front is inside the cell, and finally a directlink id.

 The first inserted data object is always placed in position 1. When more
 objects are inserted at the front end of the cell, they are inserted at
 position 1 and the other data object are shifted downwards in the cell.

 Data object can also be inserted at the rear end of the cell. In this case
 it is positioned in the free position with lowest index.

 Data objects can be inserted

 1. by a connected transport object (NMpsTrp, NMpsTrpRR or NMpsTrpFF). A transport
    object can insert an object at the front or rear end of the cell.
 2. by the extern function. This is used by application programs. An data object can
    be inserted at arbitrary position.

A subwindow to a NMpsCell object is used, when the same operation should be
executed for all the data objects in the cell. The code of the subwindow will,
during one plc scan, be executed

- one time for initiation
- one time for each data object in the cell.

The data objects are refered to with the CurrentData object. You can also use
the CurrentIndex object, which gives the index of the current data object.
During the initiation phase, CurrentData and CurrentIndex is zero.

Since the subwindow is executed several times in the same plc scan, it should
not contain objects with state attributes.

• CurrentData
• CurrentIndex
• NMpsTrp
• NMpsTrpFF
• NMpsTrpRR

Connection to a transport object, NMpsTrp, NMpsTrpFF or NMpsTrpRR.

Data objects transported into the cell is inserted at the front end of the cell.
They will be inserted at first position and the other data object are
shifted downwards in the cell.

Data objects transported from the cell is fetched from the front end with
index 1. The other data objects are shifted upward in the cell.

Connection to a transport object, NMpsTrp, NMpsTrpFF or NMpsTrpRR.
Data transported into the cell is inserted at the rear end of the cell.
They will be inserted at first free position and the other data object
remains their position.

Data objects transported from the cell is fetched from the rear end.
The other data object remains their position.

 Maximum number of data objects in the cell. Larges MaxSize is 30.

Special functions of the cell.
Function is a bitmask, and the functions can be superimposed.

4   If an data object is removed from the cell by the extern function
    (ExternOpType=2,3 or 4) the data object is also remove from the rtdb
    database.

8   When the cell is reseted by the ResetObject, the dataobject is also
    removed from the database rtdb.

16  Backup. The cell and data objects in the cell, is backed up by
    the nmps backup process.

Digital object that will cause reset of the cell, i.e. all data object are removed.
Name of an attribute of type pwr_tBoolean. When the attribute is high,
all the data object are removed from the cell. If Function 8 is set, the objects
is also removed from the rtdb database.

Flag for interaction with the nmps backup process.
If the flag is set the cell is included in the next incremental backup.

Indicates that the cell i loaded from the nmps backup at startup.

Flag for interaction with nmps applications using the NMpsAppl API.

Flag that indicates that initiation should be done.

Flag for interaction with the nmps mirror handler.

Indicates that the cell is full. Number of data objects equals MaxSize.

Number of data objects in the cell.

Not used.

The last occupied index in the cell.

Not used.

Indicates that a new object is inserted at front end of cell.
FrontNew is true in one plc scan.

Indicates that a new object is inserted at rear end of cell.
RearNew is true in one plc scan.

Objid for a data object that is inserted from an extern program.

Type of extern operation.

0   Insert ExternObjid into index 1 in the cell.
1   Insert ExternObjid into the index specified in ExternIndex.
2   Remove the object in index 1 in the cell.
3   Remove the object in the index specified in ExternIndex.
4   Remove the object with the objid specified in ExternObjid.
8   Move the object specified in ExternObjid one step forward in the cell
    (to higher index).
9   Move the object specified in ExternObjid one step backwards in the cell
    (to lower index).
10  Remove the object with the objid specified in ExternObjid. The object
    is not remove from the database, even if Function 4 is specified.

Indicates that an extern function shoud be executed.
When an application wan't to execute an extern function, it should
first fill in the other extern attributes and the the ExternFlag.
If there is a chance of collision between application programs,
you should check that ExternFlag is not already set.
The ExternFlag is reset by the cell when the extern function is finished.

Index in the cell where an object is to be inserted or remove.

Status of the last executed extern operation.

Pointer to data object with highest index.

True if the front of the data object with highest index is inside the cell.

True if the back of the data object with highest index is inside the cell.

Pointer to data object in index 1.

True if the front of the data object in index 1 is inside the cell.

True if the back of the data object in index 1 is inside the cell.