The Field Control Table (FCT) is a storage area defined within the application program area and used during map processing. It is used by the application program to alter the display characteristics of individual fields during output processing and to receive additional information about each field during input processing.

The entries in a given FCT are called Field Control Table Entries (FCTEs). There are three forms of FCTEs, only one of which will exist in any one FCT:

• Short form

• Long form

• Extended form

The short form of the FCTE has only:

FIELD-NAME

The fields in the long form FCTE are:

FIELD-NAME
INPUT-FLAG 
FDC-OVERRIDE  

The fields in the extended FCTE are:

FIELD-NAME
INPUT-FLAG 
FDC-OVERRIDE 
COLOR-OVERRIDE 
SYMBOL-SET-OVERRIDE  

FCTE fields are described in the following table.

Field Name	Offset	Len	Description
FIELD-NAME	0	6	The name specified must be the same as that specified for a field name within the map being used. If no match is found, the name is ignored.
INPUT-FLAG	6	1	Space Input was entered and is valid. N No data entered for this field. I Invalid data entered. O Overflow. Too much data entered. U Underflow. Too many decimal places entered S Null entry. The field was entered with no data. This can be caused by use of the selector pen, or by entering a keyword with no data. In either case, an FDC of L must have been specified for this field when the map was built, or in the FDC-OVERRIDE entry of the FCTE. D The DUP key was pressed for this field.
FDC-OVERRIDE	7	3	The FDCs entered here are concatenated to the FDCs specified for the field in the map. The FDCs is then processed. The last FDC specified takes precedence, if conflicting FDCs exist. A special FDC of I can be placed in any position of this field and causes this FCTE to be ignored. FDCs are fully described in Field Descriptor Codes
COLOR-OVERRIDE	10	2	The two-character color override replaces the map's color attribute for this field.
			BL blue RE red PI pink GR green TU turquoise YE yellow NE neutral or blank neutral
SYMBOL-SET-OVERRIDE	12	1	The symbol set override replaces the map's SYMBOL-SET-ID for this field.