68
Change operation allows you to register dummy I/O Units in the I/O table. By
reserving an entry in the I/O table with this operation, you can prevent word
number discrepancies when an I/O Unit is to be added to the System in the
future. A dummy I/O Unit can also be registered to prevent discrepancies
after an I/O Unit is removed.
When this operation is performed for the first time, the I/O verification error
message is displayed because the registered I/O table does not agree with
the actually mounted units. Disregard this error message. This message will
not be displayed for word reservations (
3
, see below).
Dummy I/O table entries can be made for Input Units (use the
1
key), Output
Units (use the
0
key), and for words (use the
3
key). Press the key once for
each Unit or word, e.g., pressing the
3
key twice before pressing
WRITE
will
reserve two words. Up to four words may be reserved for each slot.
Note
An Input Unit reservation cannot be used for an Output Unit and vice versa.
Also, dummy I/O Units cannot be registered for Remote I/O Units, Optical I/O
Units, or Interrupt Units.
Key Sequence
I/O types
0: Output
1: Input
3: Word
I/O table read in progress
Preparation for Operation
Section 4-5
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