In our previous two issues, we discussed troubleshooting digital output modules. Troubleshooting analog modules is a bit more complicated, for two reasons: Analog modules aren't on/off, as digital ...

The I/O modules allow easy connections for photo eyes, proximity sensors, limit switches, pushbuttons, light curtains, or any other discrete control device. The 12-bit, low-resolution, 4-channel, ...

The SNAP-AIRATE-HFi rate input and SNAP-AOD-29-HFi pulse-width modulation (PWM) output modules support testing, simulation, and other high-speed applications.

Does the module's output correspond correctly to its input? Determine that by forcing the PLC output to 10%, 25%, 50%, 75%, and 90% and measuring on the output terminals at the corresponding range.