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E L E C T R I C A L
P R I N C I P L E S
43
It is obvious from the circuit that if the punch
suppression feature is wired for
N
suppression, R12
will pick up every cycle that R11 is not picked up.
Therefore, punching will be suppressed when there
is no X (or digit) punched in a card.
The punch suppression feature can be used t o
perform group gang punching operations, that is,
information in interspersed master cards can be
punched into the detail cards following the master.
Either the master cards or sthe detail cards can be
X
(or digit) punched.
Product Summary
Often it is desired to accumulate several pro-
ducts before punching. This permits special oper-
ations, such
as
crossfooting on two cards, punching
the sum of several products, etc. To accomplish
this, it is necessary to prevent reading out and
clearing of the product counter. The product sum-
mary feature has the same type of controls as punch
suppression, i.e.,
X
or digit pickup and
X
or
N
control. To place the product summary in opera-
tion, a jack must be
in the
ON
position of
this switch. This causes R19 to be picked up as
long as R18B points are closed. R18 picks under
the control of R17, which in turn picks under
control of an
X
or digit punching.
The X or
D
hubs of the product summary device are wired to
the first set of brushes (read for entry and con-
trol). The
X
hub is under control of R15BL points
so that only X's can energize R17.
Once R17 is picked, it
is
held by the R17H coil
through R17A and P21 until 14.5 of the next
cycle.
Then with R17B transferred, R18 picks
when P22 makes, provided
X
control is being used.
R18 holds through R18H coil, R18A, and P23
until 13.4 of the cycle following the reading of the
X
(or digit). During the cycle that R18 is ener-
gized and R18B points are open, R19 cannot be
energized. When R19 is in a normal position, R19B
points (Section 8A) are closed to permit read-out
from the product counter, and R19A points (Sec-
tion 5A) are open t o permit cancelling the product
counter when PI1 opens.
Thus, an
X
or digit
punching will cause normal operation when set for
X
control.
If the product summary is set for
N
control,
R!8 picks every cycle that no X or digit punching
appears and normal operation continues until an
X
or digit punching appears. An
X
or digit will
cause progressive addition of products and sup-
pression of punching when set for
N
control.
A blank card with the proper control punching
must precede a product summary run if the ma-
chine has just been ,turned
ON.
Otherwise, the first
group may be over because of the random figures
which might set up in the product counter when
the switch
is
turned
ON.
Remember that on nor-
mal multiplication the product counter is cleared
before the first computation, whereas on a product
summary run, it
is
not.
Product Overflow
Often the number of columns set aside on a
card for punching the product of a multiplication
is not large enough to permit ~ u n c h i n g the largest
products. However, if only a very small percent-
age of the total number of cards exceeds the capac-
ity of the field, it may not be worth increasing the
size of the card field and thereby limiting the num-
ber of columns available for other punching.
TO
take care of such cases the product overflow fea-
ture is furnished on this machine.
To place the product overflow feature in opera-
tion, the product counter position
next
to the
highest order wired to punch is wired to the pro-
duct overflow entry hub.
Observe that P38 cam
contact (Section 9B) is in this circuit and that
P38 will permit any impulse from
9
through I
to pass and pick up R16. As long as the product
counter position wired to product overflow con-
tains O' s , nothing happens. Any digit from 1
through
9
in this position causes R16 to pick. R16
then holds through its R16H coil, R16AL, and P21
cam contact. R16AU points complete a circuit to
the error light and error relay R57 (Section I l B ) ,
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