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Heidenhain Controller
Communication · Intermediate · 30-120 minutes
HEIDENHAIN 230-046B - Fast PLC input on impermissible bus system
Alarm 230-046B occurs when a fast PLC input is incorrectly configured in the IOC file on an unsupported bus system. Fast PLC inputs are restricted to HSCI-PL (High Speed Communication Interface - PLC) or internal PL bus systems only, and attempting to define them on other bus types like standard Ethernet or serial interfaces will trigger this alarm.
230-046B
HEIDENHAIN 230-046B - Fast PLC input on impermissible bus system
Fast PLC input on impermissible bus system
A fast PLC input was configured on an unsupported bus system. Fast inputs are only permitted on HSCI-PL or internal PL.
Root Cause Summary
Alarm 230-046B occurs when a fast PLC input is incorrectly configured in the IOC file on an unsupported bus system. Fast PLC inputs are restricted to HSCI-PL (High Speed Communication Interface - PLC) or internal PL bus systems only, and attempting to define them on other bus types like standard Ethernet or serial interfaces will trigger this alarm.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access IOC configuration
Navigate to Setup → General → IOC Configuration and locate the PLC input definition shown in the alarm's additional information.
Document the current configuration before making changes for rollback purposes.
- 2
Verify bus system assignment
Check the bus system field for the affected PLC input and confirm it's assigned to Ethernet or another non-HSCI bus.
Do not modify active PLC inputs during machine operation.
- 3
Reassign to HSCI-PL bus
Change the bus system assignment from Ethernet to HSCI-PL or internal PL, ensuring the physical connection matches the configuration.
- 4
Validate IOC file and restart
Save the IOC configuration, validate syntax, and perform a controlled restart to apply changes.
Use the IOC validation function before restart to catch syntax errors early.
Call a technician if:
- ·HSCI-PL hardware installation required
- ·Multiple IOC validation failures persist
- ·System fails to restart after configuration changes
Prevention
- Always validate IOC configurations before applying
- Document hardware changes that affect PLC I/O assignments
- Use only supported bus systems for fast PLC inputs
- Regularly backup working IOC configurations
Common Mistakes
- Assuming all PLC inputs can be configured as fast inputs
- Using standard Ethernet for time-critical PLC operations
- Mixing legacy and current IOC syntax in the same file
- Not verifying hardware availability before IOC configuration
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