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Before we were using masibus 85xx  temp scanner with vision 120 PLC but now we are using masibus 85XX+ Temp. Scanner with VISION 120 PLC over Modbus RS485.But PLC not communicating with scanner. We don't find the address for scanner in PLC program.

Hello everyone, Im looking for resources on the "Programming Technique" aspect of plc programming (preferably a book). I already have a background in electronics ,control, programming in Arduino/C, and even a few projects in Visilogic. The resources I found up until now mostly deals with : - Introduction to electronics/computers. - Introduction to controls. - Communications. - Basic ladder logic /HMI operations. - Generic ladder examples of the common tasks (filling/emptying water tank, object on a        conveyor, HVAC control etc…). And im looking for something else here. in general, a resource that is more focused on the ladder/code, and not the plc as a whole. that teaches you problem solving and troubleshooting skills. like techniques and methods that help "break down" a complex task into the smaller, simpler, logical steps. preferably with lots of examples that help you to adopt the "Right Approach" for handling similar problems in the future. I mean….as plc programmers you all know what it feels like. You've got a task, you know what you want to get out of it, but still you're having a hard time thinking how exactly to execute it in code, step by step without (= with less 😁 ) problems. Of course it’s a matter of practicing for a long time in order to get good at it. But it seems to me that at my current level I need to broaden my "Toolkit" for such tasks before I try to solve them,  or else I will spend way too much time/effort/pure rage… trying to "Reinvent The Wheel" where it's not needed. Obviously the resource are unlikely to be based on Unitronics software, but it will help in general. Such books or guides are more common in the Arduino/Raspberry PI /etc scene, and they are very helpful. Regards Yam  

Glad your problem is solved. Thanks for reporting back.

Thanks for all the responses. turns out the problem was more hardware related (maybe). i opened the PLC up en took the jumpers for the analog inputs off and back on again. After that the problem was gone.  Could it have that one of jumpers had a lose connection and the value i saw in the debugger was jumping between 4-20 mA and either a thermo koppel or PTC input?

In case you haven't done so, check the power supply is actually supplying 24v during the plcs trying to run.  And in doing so, disconnect everything else that runs from the same supply.  It might be a short somewhere else that is shutting down the supply. And a later PS to further explain.  One of the infrequent supply failures I've had over the years gave tiny amounts of 24 out without load, leading one to think that the supply was ok.  Loading it up however, and it dropped right off.  But such behaviour initially points to the supply reacting to a short.  I finally isolated it by trying another supply, that then worked everything perfectly.