Rockwell Automation 2706 DL40 HARDWARE USER MANUAL - Manual (Page 93)

Chapter
10
Chapter 10
Using Remote I/O
Figure 10Table 10
10 – 1
Chapter 9
Using Remote I/O
This chapter discusses communication and compatibility considerations
related to using the DL40 Message Display with programmable controllers.
Topics also include the Remote I/O architecture and factors in calculating
rack size, as well as triggering messages.
The Remote I/O version of the DL40 Message Display communicates with
all Allen-Bradley programmable controllers that support the Remote I/O link.
These displays communicate with PLC controllers and Remote I/O scanners
and sub-scanners as if they were a Remote I/O rack. The displays contain all
the necessary electronics to connect directly to the Remote I/O cable that
originates from a PLC, scanner, or sub-scanner. These scanners have both
physical and logical specifications which are as follows:
Physical Specifications – The maximum number of separate Remote I/O
devices (I/O racks, drive systems, DL40s, etc.) the scanner can communicate
to.
Logical Specifications – The maximum number of racks the scanner can
address.
Note: Different scanners have different physical and logical specifications.
Please refer to Table 10.E (Remote I/O Configuration) for these
specifications.
To configure DL40s with the PLC controllers you need to know:
1. The appropriate PLC or scanner module. This is found in the next section,
Remote I/O Architecture.
2. The amount of I/O the DL40 uses for different applications.
3. The number of chassis (1771 I/O racks or DL40s) and the amount of rack
I/O addressing the scanner can accommodate.
Chapter Objectives
Communication