Final answer:
When asked to check an I/O card in a PLC, you're examining the Input/Output card for proper installation, physical condition, and correct operation.
Step-by-step explanation:
When you are asked to check out the I/O card on a PLC, you would look at the Input/Output card. The PLC, or Programmable Logic Controller, makes use of these I/O cards to interface with the outside world, managing inputs and outputs for control processes. For example, input cards may be used to read signals from sensors, while output cards activate various actuators or indicators based on the PLC's program.
Inspecting an I/O card would involve ensuring that the card is properly seated in its slot, checking for any physical damage, and verifying correct operation through diagnostic LEDs, if available, or by monitoring the appropriate signals using equipment such as a multimeter or a PLC programming device. Additionally, checking the PLC's software configuration is key to confirm that it matches the hardware setup.