Lesson 14 of 29 · 9 min read
Read the PLC: the HMI banner, the step, and the I/O lights
The controller commands every device, so it already watches every one. The HMI fault banner, the current step, and the card LEDs are free readings that pick the lane before the meter comes out.
This lesson is part of the course
Readings are scored to your account. The Check Yourself questions at the end of each one count toward your certificate. Sign in to read this one and keep the record.