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Siemens SINUMERIK Controller
Communication · Intermediate · 5-15 minutes
Siemens 5000 - Communication job not executable
SIEMENS alarm 5000 'Mode Change Required' occurs when the SINUMERIK control detects that the current operating mode is incompatible with the requested operation or program execution. This typically happens when switching between AUTO/MDA/JOG modes or when specific machine functions require a different operational state than currently active.
5000
Siemens 5000 - Communication job not executable
Communication job not executable
The communication job (data exchange between NCK and HMI, e.g.: loading an NC part program) cannot be executed because there is insufficient memory space. Cause: too many communication jobs in parallel Control reaction: Alarm display.
Root Cause Summary
SIEMENS alarm 5000 'Mode Change Required' occurs when the SINUMERIK control detects that the current operating mode is incompatible with the requested operation or program execution. This typically happens when switching between AUTO/MDA/JOG modes or when specific machine functions require a different operational state than currently active.
Safety
- Only qualified personnel should diagnose and clear control alarms; follow the machine builder's safety procedures and lockout/tagout where hardware work is required.
Causes and Fixes
- 1
Check Current Operating Mode
Press the MODE key on the MCP (Machine Control Panel) and verify the current mode displayed on the HMI status bar.
The active mode is highlighted in the mode selection area of the SINUMERIK Operate interface
- 2
Review Program Requirements
Check if the NC program contains mode-specific commands like STOPRE or requires continuous path mode that mandates AUTO operation.
Never force mode changes during active machining operations
- 3
Switch to Required Mode
Use the mode selector switch on MCP to change to AUTO mode, ensure all safety conditions are met before proceeding.
Wait for the 'Mode Ready' indication before starting program execution
Call a technician if:
- ·Safety system faults persist after proper reset procedures
- ·Mode switching hardware (MCP selector) malfunction
- ·Persistent alarm after all mode requirements verified
Prevention
- Always verify mode requirements before starting NC programs
- Complete all tool operations before mode changes
- Maintain proper reference point procedures during shift changes
Common Mistakes
- Attempting to run AUTO programs in MDA mode
- Ignoring safety prerequisites for mode changes
- Not completing axis referencing after power-up
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