Rockwell Automation 1747-DCM,D17476.8 Direct Communication Module - Manual (Page 44)

Chapter 6
Programming
6–2
The following programming examples are typical of applications using the
DCM. In each example the portion of the scanner image assigned to the
DCM is logical rack 2, starting group 0, 1 full rack, and is located in SLC
physical slot 3.
DCM 1
Input Output
SLC Processor Power Supply
Physical Slot # 0 1 2 3 4 5 6
Physical Input into PLC – Physical Output from SLC
] [
I:000
00
( )
O:021
00
] [
I:3.1
00
]/[
I:3.0
08
( )
O:1.0
00
PLC
SLC
PLC
Processor
RIO
Scanner
DCM SLC
Processor
RIO
Input Output
IN
OUT
Logical Or Status Bit
In the example above, PLC output O:021/00 controls the (on/off) status of
DCM input I:3.1/00.
I:3.1/00 is used as a conditional ladder logic along with the Logical OR input
status bit to control SLC output O:1.0/00.
Programming Examples