Rockwell Automation 1771-DCM USER MANUAL 1771-DCM - Manual (Page 43)

Calculating Transfer Time
Chapter 7
7Ć9
An I/O chassis can appear more than once in a rack list of I/O
chassis. Count it and the block transfer module(s) that it contains as
often as it is listed.
Figure 7.1
Diagramming I/O Channels
Step 1 Ć Diagram the chassis connected in series to each channel
(up to 4) of your scanner module. Then, fill in the information called fo below.
Example values have been added.
1
2
3
4
1 0 2 0
0 0
1 0
= I/O chassis
n = number of block tranfer
modules in chassis
Make interactive thru processor LIST
Description Number Ch 1 Ch 2 Ch 3 Ch 4
Active I/O channels
Block-transfer I/O channels
Block-transfer modules on each
I/O block transfer channel
I/O chassis on each block transfer
I/O channel
(I/O chassis in rack list)
3
2
3
4
0
0
1
2
0
0
12828
2. Using information from the diagram of I/O channels (Figure 7.1),
look up the nominal time from the table in Figure 7.2.