Rockwell Automation 1747-DCM,D17476.8 Direct Communication Module - Manual (Page 58)

Chapter 8
Application Examples
8–4
In the following application, the PLC-5/15, via its integrated RIO scanner
and the DCM, will monitor the analog data from an SLC 500. This case is
unique in that the data to be monitored is twice what the DCM can transfer.
The program in the SLC 500 will multiplex the data into four, 4-word
packets with a start and end of data word attached. The start and end of data
word is also used to designate which module the data is coming from. This
is also used by the PLC-5/15 to indicate that the data was transferred
successfully.
RIO
(Belden 9463)
I/O I/O I/O I/O
PLC–5
CPU
NO4I NO4I NI4 NI4 DCM
SLC 5/01
P2
Й
Й
Й
Й
Й
Й
Й
ЙЙ
ЙЙ
= slot not used
Module Configuration
PLC-5 configuration for scanner I/O status, inhibit bits:
S:27/0 = *
S:27/1 = 0
S:27/2 = 1
S:27/3 = 1
* = Don’t care
DCM configuration:
Rack Address = 1
I/O Group = 0
Baud Rate = 57.6K baud
Clear on Faults = No
Last Rack = No
Rack Size = Full Rack
Supplementary Example