TechTalk : Editing Logic Online In RSLogix 500

Online editing function in RSLogix software allows PLC programmers to monitor and correct the logic live. You can see all the instantaneous values which makes it a good debugging tool as well. ¬†You can make logic modifications such as insert, edit and delete logical instructions. Zone markers (denoted by red colour in the rung number) Read more about TechTalk : Editing Logic Online In RSLogix 500[…]

TechTalk : RSLogix 500 – AFI Alternates

The AFI (also known as Always False Instruction) is a ladder logic rung instruction that sets the rung output to false; generally for the purpose of debugging and trouble shooting the logic.     In the world of Rockwell-AllenBradley, AFI instructions set is only available in RSLogix5 (PLC5) and RSLogix500 (ControlLogix). There is no built-in Read more about TechTalk : RSLogix 500 – AFI Alternates[…]

TechTalk : RSLogix 500 – Going Online With Different Logic File

Every Rockwell PLC programmer know this basic rule when going online with a PLC. You PLC file in your computer MUST match with what is in the PLC. Without that exact match, you will never be able to go online with the PLC. Sometimes, when you go online with the PLC, the RSLogix500/RSLogix5 will require Read more about TechTalk : RSLogix 500 – Going Online With Different Logic File[…]

TechTalk : RSLogix – Common Mistakes Using AFI

This article is going to be a short and specific one. Its utilizing AFI instruction with coils in multiple rungs. This is one gotcha that can get programmers stuck in a hamster wheel. Notice how the coil O:2/6 is de-energized even when the shut I:1/12 is energized This de-energization coil O:2/6 is due to the Read more about TechTalk : RSLogix – Common Mistakes Using AFI[…]

TechTalk : RSLogix 500 – PID Irresponsive In RSLogix 5

You put a PID function block together and you absolutely know that everything is setup correctly, but the PID function block does not seem to respond. All the values in the PID block is static (no changing) when your RSLogix is online. It can be frustrating and long drawn process trying to debug this issue. Read more about TechTalk : RSLogix 500 – PID Irresponsive In RSLogix 5[…]