Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
Invalid input/output data length. The drive has received a communication telegram with a data length that does not match the configured I/O data length.
Possible Causes
- Master configured different I/O data length than the drive expects
- Telegram configuration mismatch (wrong device profile selected)
- Master using a different device model profile
- Communication parameter for I/O length corrupted
Troubleshooting Steps
- Step 1: Check the I/O data length configuration in the master
Master I/O length matches the drive's expected length - Step 2: Verify the correct device profile (e.g., SERCOS profile, PROFIdrive profile) is selected
Profile matches the drive model and firmware version - Step 3: Compare the master's device configuration with the drive's actual device type
Device types match; no model mismatch - Step 4: Reload the correct device description file (GSDML, XML) in the master
New device description matches the drive
How to Reset
1) Check I/O length config. 2) Verify device profile. 3) Compare device types. 4) Reload device description. 5) Reset fault.
Frequently Asked Questions
- Q: Where do I find the correct I/O data length?
In the drive's documentation or the device description file (GSDML for PROFIsafe, XML for SERCOS). The I/O data length specifies how many bytes are in the input and output telegrams.
- Q: What is a device profile?
A device profile defines the structure and meaning of the I/O data in the communication telegram. Common profiles include PROFIdrive (V2 or V3), SERCOS drive profile, and custom application profiles.
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Source: Rexroth IndraDrive HCS/HMS Fault Code List, Bosch Rexroth AG
Category: PLC & VFD
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