Rockwell Automation 1771-DCM USER MANUAL 1771-DCM - Manual (Page 22)

Chapter
6
6Ć1
Programming the 1771-DCM
We assume that you are familiar with block transfer programming, that
you can allocate data table areas for read and write data blocks, and that
you can manipulate data to and from these data blocks. We will confine
this discussion to programming characteristics unique to the 1771–DCM.
The local processor, typically a PLC–2 family mini–processor or PLC–5
family processor, reads and writes data to the 1771–DCM using block
transfers. Programming examples (Figure 6.1, Figure 6.2) assume that the
1771–DCM is set for six–word block transfers.
Figure 6.1
Local Processor Programming Example (PLC-2)
EN
FILE TO FILE MOVE
Counter Address:
Position:
File Length:
File A:
0040
001
006
0300-0305
File R: 0400-0405
Rate per Scan: 006
0040
17
DN
0040
15
17
113
10
300
Buffer File
Data Valid Bit
BTR Done Bit
EN
BLOCK XFER WRITE
Data Address:
Module Address:
Block Length:
File:
0031
131
06
0200-0205
013
16
DN
113
16
EN
013
17
DN
113
17
BLOCK XFER READ
Data Address:
Module Address:
Block Length:
File:
0030
131
06
0300-0305
Programming the 1771-DCM
Local Processor Logic