Tag: plc

M-Duino external voltage reference trap

When wiring the Arduino based Programmable Logic Controller (PLC) from Industrial Shields, I have become stuck for a little bit due to trouble understanding how to enable the outputs. Currently using their Ethernet range based on Arduino Mega 2560. Its internals seem to be quite...

Unexpected naming conventions

In IEC 61131-3 compatible programming environments, string manipulation have many inbuilt functions. Unfortunately, sometimes the routines are a little bit hard to find. Even though it is possible to do a search through available functions, just searching by name sometimes won't...