320-0FC0

Check fast input configuration

Access MOD function, select machine parameters, navigate to MP7500.x series to identify which fast PLC inputs are configured.

Document all configured fast inputs before making changes

Verify IOC file entries

Check the IOC configuration file in the TNC filesystem under /etc/tnc/ directory for corresponding fast input definitions matching MP7500.x parameters.

Always backup IOC files before modifications

Add missing IOC entries

Add the missing fast PLC input entries to the IOC file with correct syntax: FastInput_X = InputPin_Y format, then restart the control.

Use existing working entries as templates for new configurations

Verify hardware pin assignments

Check machine parameter MP7500.x values against actual PLC input card documentation to ensure pin numbers exist and are correctly assigned.

Incorrect pin assignments can cause hardware conflicts

Validate input card configuration

Access PLC program and verify that the fast input pins referenced in MP7500.x are properly configured in the PLC input mapping.

Cross-reference with electrical schematics for accurate pin identification

Correct parameter values

Modify MP7500.x parameters to match actual hardware configuration, ensuring pin numbers correspond to installed input cards.

Test each fast input individually after parameter changes

Check IOC file syntax

Open IOC file with text editor and verify proper syntax for fast input entries, checking for missing commas, incorrect brackets, or malformed parameter definitions.

Use syntax highlighting editor to identify formatting issues

Validate parameter format

Ensure fast input entries follow correct format: record(bi,"FastInput_X") with proper field definitions including DTYP, INP, and SCAN parameters.

Incorrect DTYP field can cause hardware communication errors

Test IOC file loading

Restart the IOC process or reboot TNC to test if syntax corrections resolve the alarm condition.

Monitor startup messages for additional IOC parsing errors

Check timing parameters

Review machine parameter MP7501.x for fast input scan times and compare with IOC file SCAN field values for consistency.

Typical fast input scan times range from 1-10ms depending on application

Synchronize timing settings

Adjust either MP7501.x parameters or IOC SCAN fields to match, ensuring both systems use identical timing for fast input processing.

Mismatched timing can cause input signal delays or missed triggers

Verify timing functionality

Test fast input response using PLC diagnostics or TNC input monitoring to confirm proper timing synchronization after parameter changes.

Use oscilloscope to verify actual input response times match configured parameters