A split control field is formed when you assign more than one field in an input record the same control level indicator. For a program described file, the fields that have the same control level indicator are combined by the program in the order specified in the input specifications and treated as a single control field (see Figure 1). The first field defined is placed in the high-order (leftmost) position of the control field, and the last field defined is placed in the low-order (rightmost) position of the control field.
*...1....+....2....+....3....+....4....+....5....+....6....+....7...
IFilename++SqNORiPos1+NCCPos2+NCCPos3+NCC................................
I........................Fmt+SPFrom+To+++DcField+++++++++L1M1FrPlMnZr....
IMASTER 01
I 28 31 CUSNO L4
I 15 20 ACCTNO L4
I 50 52 REGNO L4
the fields are combined in the following order to form a split control field: EMPNO DPTNO REGNO.
Figure 2 shows examples of the preceding rules.
*...1....+....2....+....3....+....4....+....5....+....6....+....7...
IFilename++SqNORiPos1+NCCPos2+NCCPos3+NCC................................
I........................Fmt+SPFrom+To+++DcField+++++++++L1M1FrPlMnZr....
IDISK BC 91 95 C1
I OR 92 95 C2
I OR 93 95 C3
I
* All portions of the split control field must be assigned the same
* control level indicator and all must have the same field record
* relation entry.
I 1 5 FLD1A L1
I 46 50 FLD1B L1
I 11 13 FLDA L2
I 51 60 FLD2A L3
I 31 40 FLD2B L3
I 71 75 FLD3A L4 92
I 26 27 FLD3B L4 92
I 41 45 FLD3C L4 92
I 61 70 FLDB 92
I 21 25 FLDC 92
I 6 10 FLD3D L4 93
I 14 20 FLD3E L4 93