In this article, we move on to discuss some advanced topics, including tag database vs. fixed memory. In order to underscore and to drive home the impact of the PLC, let’s consider the legacy method ...

Each input or output instruction is assigned an address (shown below the instructions in Fig. 1, on page 22) indicating the location in the PLC memory where the state of that instruction is stored.

In an earlier paragraph, I mentioned there are 2,000 control relays, all of which are just bits in the PLC memory. C1 is one of these. Control relays can be configured with many different attributes.

From splitting PLC code into modules and validating HMI input variables at the PLC to monitoring and trending PLC memory use, these coding practices help secure controllers and the operations ...

Paired with DRAM, that pushes memory up to a maximum of 3TB (four times ... of the Seoul event to talk about penta-level cell (PLC) SSD, in which each cell can switch five bits.