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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 101644 - Write access only in start-up state Device Ready (device: p9=0).
Alarm 101644 indicates an attempt to write or modify system parameters while the control is in an operational state rather than the required start-up mode. The SINUMERIK 840D restricts certain configuration changes to start-up state (Device Ready) to prevent inadvertent modifications during production that could compromise machine safety or performance.
101644
Siemens 840D 101644 - Write access only in start-up state Device Ready (device: p9=0).
Write access only in start-up state Device Ready (device: p9=0).
Siemens SINUMERIK operator message 101644: Write access only in start-up state Device Ready (device: p9=0). 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 101644 indicates an attempt to write or modify system parameters while the control is in an operational state rather than the required start-up mode. The SINUMERIK 840D restricts certain configuration changes to start-up state (Device Ready) to prevent inadvertent modifications during production that could compromise machine safety or performance.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Press the control system key and navigate to 'Start-up' mode (Commissioning/Services menu may require access level 3 or 4).
Ensure machine is in a safe state and production is stopped before entering start-up mode.
- 2
Enter the password for service access level if prompted (typically Level 3 'Service' or Level 4 'Manufacturer').
- 3
Make the required parameter changes in start-up mode, then perform a control restart (Power ON) to activate changes.
Document all parameter changes for traceability and verify settings before restarting production.
- 4
Exit start-up mode and return to normal operation mode after restart is complete and system initializes successfully.
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Always verify with your machine manual or a certified technician before performing service procedures.