Files posted by neilr216
Ethernet I/P Network Infrastructure [ODVA]
Do more with less.
Write PLC code for an ancient Telesis pinstamp printer
from the early 1990's, replacing a flaky ink jet printer
that never worked properly
Existing control system is an AB SLC500 PLC controlling
a sixteen station assembly line.
An AB basic module was used to communicate to the ink jet.
Our options were:
1) Modify basic module code to suit ancient pinstamp
2) Find another way of doing it since we were in a hurry
and didn't have enough experience with the AB system
to do it in time.
We opted to take an existing OMRON CQM1 PLC that we had
gathering dust in the corner, and write code for the pinstamp
Our part model and reject codes would be sent from the AB
discretely as binary inputs to the CQM1
Using the CQM1 RS-232 port, the Telesis functions strictly
as a printer with no confirmation signals sent back to the CQM1
Having installed a clock module in the CQM1 we were able to extract
the Julian day and year and print it along with the model # and
reject code .
Not exactly the finest example of modern technology, but it
Who said that OMRON and AB can't get along!
P.S. - DM memory saved in project!
This is an example of a sequencer using a reversible shift register instruction
Easy to troubleshoot because you can see what step it is on when the sequence stops for whatever reason.
Easy to add steps and not too bad to insert steps.
This program example shows the ease with which you can move to a specific step in the sequence after an alarm or stoppage.
Software Release 2.0
How Safe is Allowing Remote Access to Omron PLCs
Via the Internet and How is it Accomplished?
Content-centric networking (also content-based networking) is a new approach to the architecture of computer networks notably pioneered by Van Jacobson.
Its founding principle is that a communication network should allow a user to focus on the data he or she needs rather than having to reference a specific physical location where that data is to be retrieved from. This stems from the fact that the vast majority of current Internet usage (about 90% ) consists of data being disseminated from a source to a number of users.
The current architecture of the Internet revolves around a conversation model created in the 1970s to allow geographically distributed users to use a few big immobile computers. The content-centric approach seeks to make the basic architecture of the network to current usage patterns.
The new approach comes with a wide range of benefits one of which being building security (both authentication and ciphering) into the network and at the data level.
Despite all its advantages this idea doesn't seem to map very well to some of the current uses of the Web (like web applications where data is generated on the fly according to user actions) or real-time applications like VoIP and instant messenging. But one can envision an Internet where content-centric protocols take care of the diffusion-based uses of the network creating an overlay network while genuine conversation-centric protocols stay on the current infrastructure.
Devicenet Plant Floor Troubleshooting Guide
TCP/IP Tutotrial And Technical Overview