# Group IO Bit Size

**URL:** <https://tech-community.robotics.abb.com/t/group-io-bit-size/8978>\
**Category:** RAPID Programming\
**Created:** [July 18, 2019, 5:17pm UTC](https://tech-community.robotics.abb.com/t/group-io-bit-size/8978 "2019-07-18T17:17:48Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bbarnett](https://avatars.discourse-cdn.com/v4/letter/b/6bbea6/32.png) [@bbarnett](https://tech-community.robotics.abb.com/u/bbarnett)\
**Post date:** [July 18, 2019, 5:17pm UTC](https://tech-community.robotics.abb.com/t/group-io-bit-size/8978/1 "2019-07-18T17:17:48Z")

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How many bits is the max for group IO? I assumed 32 bits but I’m only seeing 16.

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**Author:** ![YoDoug](https://avatars.discourse-cdn.com/v4/letter/y/e0b2c6/32.png) [@YoDoug](https://tech-community.robotics.abb.com/u/YoDoug)\
**Post date:** [July 18, 2019, 5:35pm UTC](https://tech-community.robotics.abb.com/t/group-io-bit-size/8978/2 "2019-07-18T17:35:46Z")

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We use 32bit in our IRC5. We send/receive 256 in/out from the Anybus Ethernet adapter and group them in 32 bit Group variables.

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**Author:** ![bbarnett](https://avatars.discourse-cdn.com/v4/letter/b/6bbea6/32.png) [@bbarnett](https://tech-community.robotics.abb.com/u/bbarnett)\
**Post date:** [July 18, 2019, 5:48pm UTC](https://tech-community.robotics.abb.com/t/group-io-bit-size/8978/3 "2019-07-18T17:48:22Z")

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Thanks YoDoug. I just found my issue to be the UDT on the AB PLC side.

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**Author:** ![lemster68](https://dub1.discourse-cdn.com/flex005/user_avatar/tech-community.robotics.abb.com/lemster68/32/1945_2.png) [@lemster68](https://tech-community.robotics.abb.com/u/lemster68)\
**Post date:** [July 18, 2019, 6:29pm UTC](https://tech-community.robotics.abb.com/t/group-io-bit-size/8978/4 "2019-07-18T18:29:45Z")

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Interesting note to add. With newer robotware they no longer have to be contiguous bits, you can split it up.