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Heidenhain Controller
PLC · Intermediate · 30-120 minutes
HEIDENHAIN 320-0060 - IOC configuration has invalid PLC operands
Alarm 320-0060 occurs when the IOC (Input/Output Configuration) contains PLC operand assignments that conflict with already allocated system resources. This typically happens during system configuration when operands are double-assigned between user PLC programs and internal TNC functions like handwheels or PL boards.
320-0060
HEIDENHAIN 320-0060 - IOC configuration has invalid PLC operands
IOC configuration has invalid PLC operands
The IOC hardware configuration has an issue that prevents proper operation. Check the configuration settings and hardware compatibility.
Root Cause Summary
Alarm 320-0060 occurs when the IOC (Input/Output Configuration) contains PLC operand assignments that conflict with already allocated system resources. This typically happens during system configuration when operands are double-assigned between user PLC programs and internal TNC functions like handwheels or PL boards.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access BUS diagnosis display
Navigate to MOD > System Information > BUS diagnosis to identify which specific operands are causing conflicts.
The BUS diagnosis will show exact operand numbers that are double-assigned
- 2
Check PL board operand allocation
In MOD > Machine Parameters, review MP7680-MP7699 series for PL board I/O assignments and note reserved operand ranges.
Do not modify PL board parameters without understanding system dependencies
- 3
Modify IOC configuration
Access MOD > IOC configuration and reassign conflicting operands to unused addresses outside the PL board reserved ranges.
Use operand numbers above 1000 to avoid most system conflicts
- 4
Validate configuration
Save IOC changes and perform a control restart to verify alarm clearance and proper I/O function.
Call a technician if:
- ·PLC program modifications required
- ·Hardware configuration uncertainty
- ·Multiple failed resolution attempts
Prevention
- Document all operand assignments before IOC changes
- Use operand numbering scheme with reserved ranges
- Validate IOC configuration after any hardware modifications
Common Mistakes
- Ignoring BUS diagnosis details
- Modifying PL board parameters unnecessarily
- Not updating PLC programs after operand changes
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