We are running a DL205 PLC and I have been working on this machine for months. With that, the program was created by someone else and I have been trouble shooting it ever since as so many things are not right. It is a great learning experience, but I am almost to the point where the program simply needs to be rewritten.

Until that actually occurs, this is what I have questions about. We have had a recurring control problem that I am trying to isolate and with that I have two areas in the ladder that for the life of me I cannot figure out why or how it is used.

2011-10-27T08:11:20Z hourly 0.1 2012-03-30T00:48:21Z yearly 0.2 2012-03-26T00:14:46Z hourly 0.1. Mar 04, 2012 A brief explanation of the Shift Register function for the application in Programmable Logic Controller. By Syed Amir Syed Omar, MTM 4/2012 UniKL Malaysia. Robo Family Kannada Serial Full Episodes.

So here it goes: First is in the shift register as required there are three rungs that are controlling it: one to initiate it, one to shift it, and one to reset it. At this point it is the reset for the shift register and rungs that has me in a quandary. Elektor 1001 Schaltungen Pdf Editor. They are using a T data type (T167 to be exact) and it is located in several different places in the program as part of rungs to allow valves and motors to run, but there is nothing defining it at all. My question, is how does the PLC control T167 or know what to do with it?

I have searched in the PLC as well as the HMI and nothing. At this point the only thing that I have hypothesized was that every new day it resets. Second is also related to the shift register. I have output their status to the HMI and I can see what the PLC is thinking as far as what is in what position.

With that, there is one position that simply never changes status even though every one before and every one after will change as it should. So with that the range is C350-C377 and at position C360--- the status never changes. The C360 value is used only in one place in the program and with that it is right next to C361/2/3 and those will change, but never the C360.