In part 1 of this lesson, we talked about the PII section of the performance data window found in the Online & Diagnostics area. We continue discussing the performance data section here briefly touching on the Process Image Output or the PIQ portion which we covered in great detail previously. We then talk about how much bit memories, timers, counters, local data, OBs or organization blocks, FCs, FBs, DBs, SFBs, and SFCs may be used within the project. These available use areas are determined again by PLC type. We are going to demonstrate some of the OB’s and SFC’s available for use. Open up this lesson and see what great features are provided with your PLC.
There may be an occasion that you have been hired by a company to make changes to an existing plant process but they don’t have a copy of the PLC program or you had a computer that the hard drive failed on and you have lost all of your data including past PLC programs, what can you do? Most PLC m...
In the previous lesson, we gave some instruction on how to upload a program from a PLC in the event that you don’t have a copy of the existing program. In this lesson we are going to discuss how to protect your programs from unwanted modification or viewing. The software package allows users to p...
In the past few lessons we have been introducing you to the many tools used within the programming environment. In this lesson, we are going to discuss a tool called Cross Reference. Cross reference is a very useful function that works to find areas within a program that use a certain object or D...
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