Bool val; RapidData rd = this.controller.Rapid.GetRapidData("T_ROB1", "Module1", "flag_1"); if(rd.Value is ABB.Robotics.Controllers.RapidDomain.Bool) { val = (ABB.Robotics.Controllers.RapidDomain.Bool)rd.Value; val.Value = true; using (Mastership.Request(this.controller.Rapid)) { rd.Value = val; } }