Allen-Bradley ControlLogix 1756-DMD30, Руководство пользователя, Страница: 34 / 369

Publication 1756-UM522B-EN-P - February 2003
3-8 Drive Module Features
Electronic Keying
Instead of plastic mechanical backplane keys, electronic keying
allows the ControlLogix system to control what modules belong in the
various slots of a configured system.
During module configuration, you must choose one of the following
keying options for your SynchLink module:
•
Exact Match
•
Compatible Match
•
Disable Keying
When the controller attempts to connect to and configure a Drive
module (e.g. after program download), the module compares the
following parameters before allowing the connection and
configuration to be accepted:
•
Vendor
•
Product Type
•
Catalog Number
•
Major Revision
•
Minor Revision
The comparison is made between the keying information present in
the Drive module and the keying information in the controller’s
program. This feature can guard against the inadvertent operation of a
control system with the wrong module in the wrong slot.
Exact Match
All of the parameters listed above must match or the inserted module
will reject a connection to the controller.
Compatible Match
The Compatible Match mode allows a Drive module to determine
whether it can emulate the module defined in the configuration sent
from the controller.
With ControlLogix Drive modules, the module can emulate older
revisions. The module will accept the configuration if the controller’s
major.minor revision is less than or equal to the physical
module’s revision.