Using this chapter, Understanding controlnet i/o, Planning to use your controlnet plcć5 processor – Rockwell Automation 1785-L20C_L40C, D17856.5.14 ControlNet PLC-5 Programmable Controllers User Manual User Manual
Page 29
Chapter
2
2-1
Planning to Use Your ControlNet
PLCĆ5 Processor
If you want to read about:
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Understanding ControlNet I/O
2Ć1
Understanding ControlNet I/O mapping
Using the ControlNet PLCĆ5 processor in a ControlNet I/O system
Converting from a remote I/O system to a ControlNet I/O system
The ControlNet system is designed to:
provide high-speed, repeatable, deterministic I/O transmission
allow control and message information to co-exist on the same
physical media
make sure that I/O data transfers are not affected by
- programming-terminal message activity
- inter-PLC processor message activity on the network
Scheduled DataĆTransfer Operations on a ControlNet Network
ControlNet scheduled data transfer on a PLC-5/20C or -5/40C processor:
is
continuous
transmits asynchronous to the ladder-logic program scan
occurs at the actual rate displayed on the 6200 Programming Software
ControlNet I/O Mapping (Monitor) screen in the
Act
Net
Pckt
Time
(ms)
—Actual Network Packet Time—field
In scheduled discrete I/O data transfer, for example, between logic
scans—i.e., during “housekeeping”—the following updates occur:
the gathered input image is moved from a private memory buffer to the
processor’s input-image file for use during the next logic scan
the data from the output-image file is put into a private memory buffer
and is sent during the next scheduled communication
Using This Chapter
Understanding
ControlNet I/O