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Online Addition of Units and Backplanes
7-7
Online Addition of Units and Backplanes
7-7-1
Conditions Required for Online Addition
Systems Supporting Online Addition
Operation
Online Unit addition
Online Expansion Rack addition
Online Addition of Basic I/O Units
This function allows previously unregistered Units to be added and controlled
during operation. Both Units and Expansion Racks can be added during oper-
ation.
Note A Duplex CPU Unit with unit version 1.3 or later is required to add Units
online. CPU Bus Units cannot be added online. Expansion Racks can be
added online only in a Duplex CPU, Dual I/O Expansion System.
The following table shows the Units that can be added to each system.
Duplex CPU, Dual I/O
Expansion System
Supported
Supported
Note With a Duplex CPU, Single I/O Expansion System or Single CPU System, the
system may stop if an Expansion Rack is added.
When adding a Basic I/O Unit online, the new Unit's allocated words must not
duplicate any words allocated to other Basic I/O Units that are already
mounted. Add the new Unit to a slot position so that the allocated words will
not be duplicated, as shown in the following diagrams.
• Creating the I/O Table using the Default Starting Words for each Rack
Duplex CPU, Single I/O
Expansion System
Supported
Not supported (See note.)
A Unit cannot be added to the
shaded slots because the word
address would be duplicated.
Units can be added in these
slots starting from CIO 9.
Section 7-7
Single CPU System
Not supported
Not supported (See note.)
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