Allen-Bradley PLC-5 MAP/OSI, User Manual, Page: 37 / 135

Chapter 3
MMS and Your Coprocessor
3-11
Output Image (O) Mappings
The table that follows provides sample mappings of output image data
types, where:
O:000/x,n is a bit–string of length n starting at bit x (octal) of the specified
word.
Important: Note that addressing in the Output Image Mapping is in octal.
This does not pertain to the ‘‘size” information. For example,
‘‘O:003/5,10” specifies a bit string of length 10 (vs. length 8).
Address: MMS Data Type:
O:000 BIT STRING (16 bits)
O:001,25 BIT STRING (25 bits)
O:000/10 BOOLEAN
O:001/3,5 BIT STRING (5 bits)
See the section titled Additional Information on Using Data Types, later in
this chapter, and Appendix A of this manual for more information on
mapping MMS data types onto PLC–5 data files.
Block Transfer (BT) Mappings
The following is the format of a block transfer control structure as viewed
by MMS:
BOOLEAN RW
BOOLEAN TO
BOOLEAN NR
BOOLEAN EW
BOOLEAN CO
BOOLEAN ER
BOOLEAN DN
BOOLEAN ST
BOOLEAN EN
INTEGER RLEN (16 bits)
INTEGER DLEN (16 bits)
INTEGER FILE (16 bits)
INTEGER ELEM(16 bits)
INTEGER RGS (16 bits)
Important: Refer to your PLC–5 Programming Reference Manual for
descriptions of the individual fields in data type structures.
AB Parts