Allen-Bradley devicenet modules in logix5000 control systems Manual Do Utilizador

Publication DNET-UM004A-EN-P - March 2004

Control a Device        7-17

In general:

• Use the DINT data type for the source or destination tag, even 

when you set or get less than 4 bytes.

• Make sure the source value stays within the minimum and 

maximum values for the parameter that you are setting.

When setting a value, the CIP Generic MSG instruction takes only the 
specified number of bits from the source tag.

tag that controls the instruction 

• Scope – controller
• Data type – MESSAGE
• The tag cannot be part of an array or a 

user-defined data type.

source or destination for the data that the 
instruction sets or gets

• Scope – controller
• Data type – In general, use the DINT 

data type, even when you set or get 
less than 4 bytes.

• Value – Make sure the source value 

stays within the minimum and 
maximum values for the parameter 
that you are setting.

number of bytes (only if setting a value)

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

For example, if Source Length = 1 byte, then the CIP Generic MSG

instruction sends the first byte of MySource_1.