Rockwell Automation 1747-DCM,D17476.8 Direct Communication Module - Manual (Page 67)

B Appendix
B–1
DCM Addressing Worksheet
This appendix provides a worksheet for keeping track of the elements of each
I/O address for your system’s DCMs. Topics include:
•
directions
•
addressing review
In the table on the next page, enter the elements of each I/O address for each
DCM in your system. All DCM inputs and outputs are addressed with
respect to the SLC.
Make sufficient copies of this worksheet to cover all DCMs in your system.
PLC Addresses
I = Input
O:017/10 I:023/10
02 = Logical Rack
3 = I/O Group
10 = Bit (octal)
O = Output
01 = Logical Rack
7 = I/O Group
10 = Bit (octal)
PLC Input Address PLC Output Address
SLC Addresses
I = Input
O:1.7/8 I:2.3/8
2 = Physical Slot
3 = Word
8 = Bit (decimal)
O = Output
1 = Physical Slot
7 = Word
8 = Bit (decimal)
SLC Input Address SLC Output Address
If you configure the DCM as: Then: Including the Status Word
1/4 Rack
1 data word (16 bits of I/O
data) is transferred.
Total transfer = 2 words
1/2 Rack
3 data words (48 bits of I/O
data) are transferred.
Total transfer = 4 words
3/4 Rack
5 data words (80 bits of I/O
data) are transferred.
Total transfer = 6 words
Full Rack
7 data words (112 bits of I/O
data) are transferred.
Total transfer = 8 words
Directions
Addressing Review