355
Allocating First Words to Slots and Reserving Words Section 8-3
tion status for different unit version combinations are shown in the following
table.
8-3 Allocating First Words to Slots and Reserving Words
The first word allocated to a slot on any Rack can be set with the CX-Pro-
grammer’s I/O table edit operation regardless of the position of the slot. This
feature can be used whenever it’s necessary to control allocations to specific
Units regardless of the position of the Unit to group allocated I/O words by
device or circuit or to prepare for future changes to or additions of I/O Units for
system design changes.
Word Allocations When setting first words for slots, the first word must be set for slot 00 on the
CPU Rack. The first word can then be set for any slot on any Rack for up to 63
other slots.
Each first word set for a slot creates a group starting with that slot. Words are
allocated starting from the specified word to the first slot in the group and con-
tinuing left to right allocating consecutive words to each Unit until the next
group (i.e., until the next Unit for which a first slot word is set). The next group
can start on the same Rack or on a following Rack.
Source CPU Unit Original I/O
allocation status
Destination CPU Unit
Unit version of CPU Unit at the backup/restore
destination
Pre-Ver. 2.0 Unit Ver. 2.0 Unit Ver. 3.0 or
later
Unit version of
CPU Unit at the
backup source
Pre-Ver. 2.0 Automatic alloca-
tion
(Same) automatic allocation
User-specified (Same) User-
specified
Switches to auto-
matic allocation.
(Same) User-
specified
Unit Ver. 2.0 Automatic alloca-
tion
(Same) automatic allocation
User-specified (Same) User-specified
Unit Ver. 3.0 or
later
Automatic alloca-
tion
(Same) automatic allocation
User-specified (Same) User-specified
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