M100....

hi I am using the melsec F2-20P, MITSUBISHI PLC, and i was wondering for the single shot command we use things like M100, M102, M103. Can anyone tell me what these M? go up to is it M999 or M1000. i need to know fast. Please help me
Thankyou

The auxilliary relays go from M100 to M177, M200 to M277 and M300 to M377. The numbering is in octal so you can't use 8's or 9's. I hope this helps.