For PLC programming, the coil and contacts can only be used in a program, not direct external inputs and outputs, is often used as a staging and so on.
Auxiliary relays use decimal address number.
Auxiliary relay is divided into the following categories:
① General auxiliary relays M0~M499 (500 points)
② power outages keep auxiliary relays M500~M1023 (524)
Equipped with backup batteries, used to save state before the power outage, and reproduce the situation at run time.
③ Special auxiliary relays M8000~M8255 (256 points) – the system provides for specific purposes, check the product manual when using.
• Coil driven by the PLC itself, users can directly contact.
For example: M8000 (monitoring), M8002 (initial pulse), M8013 (1s clock pulse)
After the user drive coil, PLC for a specific action.
Example: M8033 PLC stops output remains, M8034 refers to the PLC prohibits all output, fixed 1s M8013 clock pulse
PLC ONE 