Online Field Total Restrictions; Example - IBM 3741 Data Station Reference Manual

Online Field Total Restrictions
To ensure the accuracy of the field total in the accumulator,
remember the following restrictions:
• Use only one program to process a record.
• When backspacing to a previous record from a partially
entered,updated, or verified record, select the program
used for the previous record only after the backspace
to the previous record is complete.
• Before deleting a record, be sure the program used to
create the record is selected.
• A read out/reset field must be preceded by at least one
programmed manual field and must not be followed
within the same record by a field totals field relating
to that accumulator.
• Do not backspace to a record and select a program with
a read out/reset field if the accumulator that pertains
to that read out/reset has a value other than zero. The
accumulator will have a value other than zero if any
record was written on the disk with a field totals
program for that accumulator and data was entered in
that field in enter mode or changed in update or verify
mode.
• After updating a record, deleting a record, or correcting
a record in the verify mode, all succeeding read out/re-
set fields that were affected by the operation must be
executed. To execute this field total operation, record
advance to the record that contains the read out/reset
field, select the correct program buffer, and field ad-
vance over the read out/reset field.
• In update mode or when E-R (alternate record advance
option in enter mode) is selected, a read out/reset field
is not executed if R EC ADV is pressed before the
cursor enters that field. Therefore, advance the cursor
through all read out/reset fields before pressing
REC ADV.
• When field totals are being used in a data set, do not
use communications, second disk (except if loading
programs), or printer functions (except print record)
at any time during online field totals operations.
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• Program load functions should be done as follows:
1.
Turn off AUTO DUP/SKIP.
2. Press REC BKSP to the previous record.
3. Select program buffer O.
4.
Read program from second disk or key program.
5.
Load the program.
6. Repeat 4 and 5 for all programs to be loaded.
7. Press REC BKSP.
8.
9.
Press REC ADV twice.
Note:
Steps 7 and 8 are done to load the previous
buffer with the correct record.
Select desired program.
• When in a record with the wrong program selected,
perform the following:
1.
Set AUTO DUP/SKIP to OFF.
2. Record backspace to the previous record.
3. Select correct program.
4. Press REC ADV.
5. Set AUTO DUP/SKIP to ON if required.
Example
The transactions for one day of business are:
Item Number Item Cost
31621 1621
10897
734
41621 1621
10021 121
21100 1100
Total Cost
5197