Rockwell-automation 1769-ASCII Compact I/O ASCII Module Instrukcja Użytkownika Pobierz pdf (Strona 108)

108 Rockwell Automation Publication 1769-UM012B-EN-P - January 2014

Appendix E Using Electronic Keying

1756-CNBR module with a 1756-CN2R module. The release notes for

individual modules indicate the specific compatibility details.

When a module is created, the module developers consider the module’s

development history to implement capabilities that emulate those of the previous

module. However, the developers cannot know future developments. Because of

this, when a system is configured, we recommend that you configure your module

using the earliest, that is, lowest, revision of the physical module that you believe

will be used in the system. By doing this, you can avoid the case of a physical

module rejecting the keying request because it is an earlier revision than the one

configured in the software.

EXAMPLE

In the following scenario, Compatible Keying prevents I/O

communication.

The module configuration is for a 1756-IB16D module with module revision

3.3. The physical module is a 1756-IB16D module with module revision 3.2. In

this case, communication is prevented because the minor revision of the

module is lower than expected and may not be compatible with 3.3.

Module Configuration

Vendor = Allen-Bradley

Product Type = Digital Input Module

Catalog Number = 1756-IB16D

Major Revision = 3

Minor Revision = 3

Physical Module

Vendor = Allen-Bradley

Product Type = Digital Input Module

Catalog Number = 1756-IB16D

Major Revision = 3

Minor Revision = 2

Communication is prevented.

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