代码 320-0420: PLC: index range incorrect
问题描述与安全警告
Heidenhain TNC Series CNC 触发了严重的 PLC: index range incorrect 警报。需要由合格的操作员或维修技师立即处理，以防止在制造周期中对设备造成二次损坏或导致零件报废。在接触电气控制箱之前，请务必确保遵循标准安全和停机挂牌 (LOTO) 程序。
官方故障排除步骤
[Cause of error] PLC runtime error: - The address for a writing access to data types B/W/D/M/ I/O/T/C is, through the inclusion of the index register, in an invalid region for these operand types. - The index register contains a value, due to accessing a constant field, which is not possible for this field (less than 0, or greater than or equal to field length). - The address of a string leads through the inclusion of the index register to an invalid value. - The number of a dialog (S#Dn[X]) or an error message (S#En[X]) leads through the inclusion of the index register to an invalid value (less than 0 or greater than 999). - During the addressing of a component string. [Error correction] Edit the PLC program.
Source: HEIDENHAIN NC Error Messages — TNC7/640/620/320/128, CNC PILOT 640, MANUALplus 620 (10/2023)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
关于 Heidenhain TNC Series CNC 警报
由 Heidenhain 制造的工业控制器具有广泛的诊断系统，用于保护内部电路和机械连杆。当 TNC Series CNC 出现类似 320-0420 的错误代码时，通常表示指令值与实际传感器反馈之间存在不匹配。
完整报警清单: 4497 Heidenhain TNC Series CNC 代码s.
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