Hibass (Astro Technology) M90 OptoScan Guarding Systems. Detaild User's Manual. Includes: Applications; the OptoScan M principle; Operating a pressbrake fitted with an Optoscan guarding system; Setting the MUTE and STROK-STOP functions; Routine Checks; Fault-finding Guide; Removal and replacement of M20A Series Modules; Appendix and Supplements.