Left-Zero Logic Controls - IBM 29 Instruction Manual

Drop credit-field 1 relay.
Energize the multi-punch relay.
Prevent energizing the escape magnet.
Energize interposer 11 magnet.
Energize the punch clutch.
5. Cycle 5 (punch an 11 above the 5) :
Drop credit-field 2 relay.
Drop multi-punch relay.
left-Zero logic Controls
Figure 1-12 is a diagram of the basic left-zero opera-
tions and their controls. The read-in operations are
shown with connecting solid lines, and the read-out
operations are shown with broken lines. The diagram
can be used for both troubleshooting and a quick
reference to general operation.
1'-15