But this time, they wouldn’t share L1. Instead, each would be supplied by L1a, L1b, L1c, and L1d. Your first step in troubleshooting digital input modules is to verify the power sources: Identify ...

Hardware Description The Corona input module is seen in Figure 2 with the system diagram in Figure 3 . Figure 2. The Corona reference design board, (MAXREFDES12#). Figure 3. Diagram of the ...

In the previous two issues of this newsletter, we looked at troubleshooting digital input modules. Basically, we looked for the presence or absence of a voltage. With analog modules, it's trickier ...

Higher amperage relay output modules and an 8-point input simulator module are now available from AutomationDirect for the Click series stackable micro brick PLCs. The Click C0-04TRS-10 ($54.00) is a ...

The PuffinPLC Project is an effort to produce a Linux-based GNU Public Licensed Programmable Logic Controller (PLC). PLCs were developed in the 1960s to replace the complex electrical relay circuits ...