Rexroth IndraDrive HCS Error Code F4014

Rexroth PLC & VFD Major Communication

Model: IndraDrive HCS | Code: F4014

Applicable Systems
EFC FEX FEI HNC

Symptoms

PLC watchdog triggered. The drive's communication monitoring has detected that the master PLC has stopped updating the process data within the watchdog timeout period.

Possible Causes

  • Master PLC entered STOP mode or crashed
  • PLC program task cycle time exceeded the watchdog timeout
  • Communication link intermittent, causing missed updates
  • Watchdog timeout parameter set too short for the PLC cycle time

Troubleshooting Steps

  1. Step 1: Check the master PLC status (RUN/STOP indicator)
    PLC is in RUN mode with no faults
  2. Step 2: Verify the PLC task cycle time is shorter than the drive's watchdog timeout
    PLC cycle time < watchdog timeout (typically 2-3x margin)
  3. Step 3: Check for PLC program errors or excessive load
    PLC diagnostic shows no errors; CPU load is normal
  4. Step 4: Adjust watchdog timeout if the PLC cycle time is legitimate
    Watchdog timeout accommodates the PLC's actual cycle time

How to Reset

1) Check PLC status. 2) Verify cycle time vs watchdog. 3) Check PLC diagnostics. 4) Adjust watchdog timeout. 5) Reset fault.

Frequently Asked Questions

  • Q: What is a PLC watchdog?

    A watchdog is a timer that the master must reset by sending periodic telegrams. If the timer expires (the master stops sending), the drive assumes the master has failed and triggers a fault reaction.

  • Q: What is the typical watchdog timeout?

    Typically 5-100ms, depending on the application. Fast motion control: 5-10ms. General automation: 50-100ms. Set it to 3-5x the PLC's actual cycle time for adequate margin.

Related Rexroth Fault Codes

Source: Rexroth IndraDrive HCS/HMS Fault Code List, Bosch Rexroth AG

Category: PLC & VFD