Allen-Bradley ControlLogix 1756-DMD30, Руководство пользователя, Страница: 35 / 369

Publication 1756-UM522B-EN-P - February 2003
Drive Module Features 3-9
For example, if the configuration contains a major.minor revision of
2.7, the module inserted into the slot must have minor revision of 2.7
or higher for a connection to be made.
Disable Keying
The inserted module attempts to accept a connection to the controller
regardless of its type.
If keying is disabled, a controller makes a connection with most
modules of the same type as that used in the slot configuration.
A controller will not establish a connection if any of the following
conditions exist, even if keying is disabled:
•
The slot is configured for one module type (e.g. digital input
module) and a module of another type (e.g. Drive module) is
inserted in the slot.
•
The module inserted into the slot cannot accept some portion of
the configuration. This case should not arise if the slot is
configured for a Drive module and one is inserted.
TIP
We recommend using Compatible Match whenever
possible. Remember, though, the module will only
work to the level of the configuration.
For example, if a slot is configured for a module
with major.minor revision of 2.7 and you insert a
module with a major.minor revision of 3.1, the
module works at the 2.7 level despite having been
previously upgraded.
If possible, we suggest you make sure configuration
is updated to match the revision levels of all Drive
modules. Failure to do so may not prevent the
application from working but may defeat the
purpose of upgrading your modules’ revision levels.
ATTENTION
!
Be extremely cautious when using the disable
keying option; if used incorrectly, this option can
lead to personal injury or death, property damage
or economic loss.