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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 101655 - Parameter not readable from BOP.
Alarm 101655 indicates that the BOP (Basic Operator Panel) cannot read a specific parameter from the control system. This typically occurs when there is a communication issue between the BOP and NCU, corrupted parameter data, or insufficient access rights for the requested parameter.
101655
Siemens 840D 101655 - Parameter not readable from BOP.
Parameter not readable from BOP.
Siemens SINUMERIK operator message 101655: Parameter not readable from BOP. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.
Root Cause Summary
Alarm 101655 indicates that the BOP (Basic Operator Panel) cannot read a specific parameter from the control system. This typically occurs when there is a communication issue between the BOP and NCU, corrupted parameter data, or insufficient access rights for the requested parameter.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Check the physical connection of the BOP cable to the NCU. Ensure it is firmly seated and not damaged.
- 2
Power cycle the BOP by disconnecting and reconnecting it, or perform a control power cycle if the issue persists.
Coordinate with production - power cycle will interrupt machine operation.
- 3
Verify the BOP firmware version is compatible with the NCU software version using the HMI diagnostics.
- 4
Test with a different BOP unit if available to isolate whether the issue is with the BOP hardware or NCU side.
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