# IO Link Master - Maximum Datalength **URL:** \ **Category:** Controls & Vision\ **Tags:** automation-studio, fieldbus, plc\ **Created:** [November 21, 2024, 3:13pm UTC](https://community.br-automation.com/t/io-link-master-maximum-datalength/4995 "2024-11-21T15:13:14Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![neumueller.florian](https://avatars.discourse-cdn.com/v4/letter/n/FF8800/32.png) [@neumueller.florian](https://community.br-automation.com/u/neumueller.florian)\ **Post date:** [November 21, 2024, 3:13pm UTC](https://community.br-automation.com/t/io-link-master-maximum-datalength/4995/1 "2024-11-21T15:13:14Z")
Hi, I’m looking for a answer to the following Question: Does the B&R IO Link Master (X20 DS438A) have a maximum of Input / Output words? For my usecase there should be 3 input-words and 7 output-words per IO Link device. Is this possible for 4 IO-Link Devices per Master? I’ve done my research in the B&R Automation Studio Help but couldn’t find something useful - maybe i overlooked something. Thanks for your Help, Florian ---
**Author:** ![tommi.piiparinen](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/tommi.piiparinen/32/2183_2.png) [@tommi.piiparinen](https://community.br-automation.com/u/tommi.piiparinen)\ **Post date:** [November 22, 2024, 6:26am UTC](https://community.br-automation.com/t/io-link-master-maximum-datalength/4995/2 "2024-11-22T06:26:15Z")
This should be possible but depending on the total amount of data transferred on the X2X bus, there might be some limitations. > 8 registers with up to 32 bits are available per channel and direction. [Automation Help: X20DS438A IO-Link communication](https://help.br-automation.com/#/en/4/hardware%2Fx20ds438a%2Fx20ds438a_sw%2Fio-link___prozessdaten.html) ---
**Author:** ![system](https://europe1.discourse-cdn.com/brcommunity/original/1X/a202d64f0f03e22a662ed33fbbca6879f1efb794.jpeg) [@system](https://community.br-automation.com/u/system)\ **Post date:** [December 23, 2024, 7:54pm UTC](https://community.br-automation.com/t/io-link-master-maximum-datalength/4995/3 "2024-12-23T19:54:33Z")