Prosoft-technology MVI69-EGD Manual de usuario descargar pdf (Pagina 32)

MVI69-EGD ♦ CompactLogix or MicroLogix Platform Configuring the MVI69-EGD Module

GE Ethernet Global Data Communication Module

Page 32 of 96 ProSoft Technology, Inc.

November 3, 2008

The purpose of the Configuration Signature (CS) is to guarantee that the

produced exchange will contain data in a format expected by a consumer

module. Therefore it prevents the consumer module to process received data if it

is not compatible because of later modifications.

Whenever a consumer module receives an exchange message, it will look for a

configured consumer exchange that contains the same Exchange ID. If it finds a

matching consumer exchange it will compare the Configuration Signature for

validation.

If the exchange is not validated then the data will not be consumed.

Because this functionality is optional, the modules will exchange data even if the

Configuration Signature validation is disabled. To disable this functionality,

configure all exchanges with both CS Major and CS Minor values equal to zero.

The following rules are used by the consumer module to validate an exchange

based on its Configuration Signature:

Rules for CS Validation

An exchange will be considered valid if at least one of the following conditions is

true:

 Producer CS Major and CS Minor are both equal to 0

 Consumer CS Major and CS Minor are both equal to 0

 Producer CS Major is equal than Consumer CS Major AND Producer CS

Minor is greater or equal than Consumer CS Minor

The following table contains some examples that will help you to understand the

consumer criteria to validate received exchanges based on the Configuration

Signature:

Producer

CS Major

Producer

CS Minor

Consumer

CS Major

Consumer

CS Minor

Will Data be

Consumed?

Comment

0 0 0 0 Yes Same CS value of 0.0 (Major.Minor) validates the

exchange

0 0 1 2 Yes Producer CS value of 0.0 (Major.Minor) validates

the exchange

1 2 0 0 Yes Consumer CS value of 0.0 (Major.Minor) validates

the exchange

1 2 1 2 Yes Same CS value (1.2) validates the exchange

2 2 1 2 No CS Major mismatch - exchange is not validated

1 2 2 2 No CS Major mismatch - exchange is not validated

1 2 1 1 Yes Same CS Major and Consumer CS Minor is less

than Producer CS Minor - exchange is validated

1 2 1 3 No Same CS Major but Consumer CS Minor is greater

than Producer CS Minor - exchange is not

validated

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 95 96

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