Allen-Bradley PLC-5 MAP/OSI, User Manual, Page: 90 / 135

Appendix
A
A-1
Mapping MMS Data Types onto
PLC-5/40, -5/60 File Types
The following table contains the MMS data types and PLC–5/40, –5/60
file types for you to use as a reference when mapping the two types during
your application programming.
Refer to Chapter 2 for format examples of
the PLC Data Table File Types mapped as ‘‘MMS Structures” (as far as
MMS is concerned) and additional information related to data types.
In the following table, we use these symbols:
the letter D to indicate the ‘‘default” data type for the respective
PLC–5/40, –5/60 file type. The default data type is the type that is
returned in the response to a GetVariableAccessAttributes service
request on a variable in that field.
asterisks (*) to indicate alternate data types supported for each
PLC–5/40, –5/60 file type
numbers in parenthesis to indicate the default size
Any file that has a supported type of BitString, also has a supported type of
Boolean when accessed by a single bit address. Note that MMS arrays can
also be used/obtained when accessing the PLC controller memory.
MMS Data Types
PLC-5 Data Table File Types: Boolean: Bit String: Integer: BCD: Unsigned
Integer:
Floating
Point:
Visible
String:
Octet
String:
MMS
Structure:
Binary (B) D D
Output (O) D D
Input (I) D D
Status (S) * * D(16) *
Signed Word (N) * * D(16) *
Float (F) D
BCD (D) * D *
ASCII (A) D *
String (ST) D(-82) *(-82)
Timer (T) D
T.DN D
T.TT D
T.EN D
T.PRE D(16) *
Appendix Contents