Rockwell Automation 1771-DCM USER MANUAL 1771-DCM - Manual (Page 34)

Programming the 1771-DCM
Chapter 6
6Ć13
Your 1771–DCM must have the following revision (or later) for
compatible block transfer operation with your processor.
Processor Family 1771-DCM Revision
PLC-3 F
PLC-5 E
PLC-5/250 E
Data transfers would occur as follows when the supervisory processor is a
PLC–3:
Supervisory Processor To Local Processor
BTW Instruction Writes Data to the
1771-DCM from Binary File 3, Words
0 through 63
BTR Instruction Reads Data from the 1771-DCM
into Words 300 through 377
FB003:0000 Status Word (Zeroed)
FB003:0001 First Data Word
FB003:0002 Second Data Word
:
:
FB003:0063 Last Data Word
300 Status Word (Inserted by DCM)
301 First Data Word
302 Second Data Word
:
:
377 Last Data Word
Local Processor To Supervisory Processor
BTW Instruction Writes Data to the
1771-DCM from Words
200 through 277
BTR Instruction Reads Data from the 1771-DCM
into Binary File 2, Words 0 through 63
200 Status Word (Zeroed)
201 First Data Word
202 Second Data Word
:
:
277 Last Data Word
FB002:0000 Status Word (Inserted by DCM)
FB002:0001 First Data Word
FB002:0002 Second Data Word
:
:
FB002:0063 Last Data Word
Processor/Module Compatibility