常见西门子伺服数控NCU主板型号如下：   西门子840D/DE数控伺服系统NCU主板：     NCU 571.2 6FC5357-0BB11-0AE0     NCU 571.3 6FC5357-0BB11-0AE1     NCU 571.3 6FC5357-0BB13-0AA0     NCU 571.3 6FC5357-0BB13-0AA1     NCU 571.4 6FC5357-0BB14-0AA0     NCU 571.4 6FC5357-0BB12-0AE0     NCU 571.5 6FC5357-0BB15-0AA0