ConrolLogix read Micro850

I think I know the answer to this...

I have some data in a Micro850, stored as a "WORD" datatype. I want my Control Logix to read that info. I know my MSG works, it will read INT values.
The MSG isn't happy when I point it at a WORD datatype. Do I need to add logic in the Micro850 to convert the WORD to an INT?

Thanks
Justin

What do you use WORD data types for in Micro 800 ? I don't use those controllers so I'm not familiar with that data type and how it differs from a UINT.

The Micro 800 CIP Client Messaging quick-start document suggests that your conclusion is correct, because it calls out the data types that are accessibly with a MSG instruction from a Logix family controller, though it doesn't specifically address the WORD data type.

From Appendix F:

Logix MSG instruction can read/write SINT, INT, DINT, LINT and REAL data types using “CIP Data Table Read” and “CIP Data Table Write” message types.

BOOL, USINT, UINT, UDINT, ULINT, LREAL, STRING, SHORT_STRING, DATE, and TIME data types are not accessible with the Logix MSG instruction.

Click to expand...

I didn't write the code in the Micro850. One WORD is 16 BITS. In this machine, those BITS are alarms. I want my ControlLogix to read the WORD, haven't verified if it is possible or not yet.

It appears that the Micro800 reports the WORD type as UINT (0xc7). So I wonder if you have to declare a UINT in the ControlLogix to be able to read it? ControlLogix didn't add unsigned types until the 5580 platform (L8x) and firmware rev 32.

I've had this issue before. Moving the value into an INT as you suggested worked for me.