PMA323BE HIEE300308R1 DCS工控模块备件
收到垫子系统输出后，停止机器或消除风险所需的时间。计算中使用的机器的响应时间需要是最坏情况下的时间。某些机器的响应时间不一致，这取决于操作模式、工件的性质以及启动停止的操作周期点。如果制动器等的磨损会影响响应时间，则应考虑磨损。在某些情况下，可能需要考虑机器控制系统的进一步延迟。计算示例在本示例中，垫子系统与最坏情况下响应时间测量为0.485秒的机器一起使用。使用公式，T=t1+t2=35mS+485mS=520mS=0.520S S=（1600 x 0.520）+1200mm=832+1200mm=2032mm从2032mm到机器底板边缘，需要传感器垫。5.4.2用作周界防护区域内的存在感测系统如果危险周围区域完全封闭在防护周界内，prEN 999的要求可能不适用。在这些应用中，垫子系统检测操作员的存在，以防止操作员在外壳内时重置周界防护系统并重新启动机器。图13注：固定防护装置应符合EN 953、EN 294和EN 811的要求。合适的周界防护系统应为固定防护装置，该防护装置配有检修门，并配有带条件防护装置解锁的联锁开关（见EN 1088）。
Tthe time required to stop the machine or remove the risks after receiving the output from the mat system. The response time of the machine used in the calculation needs to be the worst case time. Some machines have inconsistent response times which are dependent upon mode of operation, nature of the workpiece and point in the operating cycle at which stopping is initiated. An allowance should be made for wear in brakes etc if this can affect the response time. An allowance for further delays in the machine control system may be required in some circumstances. CALCULATION EXAMPLE In this example the mat system is being used with a machine whose worst case response time has been measured as 0.485 seconds. Using the formula, T = t1 + t2 = 35mS + 485mS = 520mS = 0.520S S = (1600 x 0.520) + 1200mm = 832 + 1200mm = 2032mm Sensor mats will be required from 2032mm right up to the edge of the machine baseplate. 5.4.2 FOR USE AS A PRESENCE SENSING SYSTEM WITHIN A PERIMETER GUARDED AREA If the area around the hazard is totally enclosed within a guarded perimeter, the requirements of prEN 999 may not apply. In these applications the mat system detects the presence of an operator to prevent the perimeter guarding system being reset and the machine re-started while the operator is inside the enclosure. Fig. 13 NOTE: Fixed guarding should meet the requirements of EN 953, EN 294 & EN 811. A suitable perimeter guarding system would be a fixed guard with an access door fitted with an interlock switch with conditional guard unlocking (see EN 1088).
