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# Distributed IO Tier
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## Project description
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Distributed I/O Tier - is the level where electronics modules installed
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close to a particle accelerator in radiation-exposed or radiation-free
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areas controlled by the master in the Front-end tier over the
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fieldbus.
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These are usually FPGA-based boards sampling digital and analog inputs,
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driving outputs and performing various safety critical
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operations.
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**Modular and reusable Distributed I/O Tier hardware kit**
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-----
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## Project information
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### Modules
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**Main Kit:**
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The DI/OT Main Kit provides the following modules which are essential to the DI/OT system and application-independent:
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- [DI/OT 3U crate](https://ohwr.org/project/diot-crate-hw/wikis)<br>
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Backplanes and crate mechanics designs; the crate is the same for radiation-free and radiation-exposed areas
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- [RaToPUS](https://ohwr.org/project/psu-rad-acdc-230v-12v5v-110w/wikis)<br>
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100W AC/DC power supply for radiation tolerant DI/OT crate; an off-the-shelf power supply at higher capacity may be used outside of radiation
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- [MoniMod](https://ohwr.org/project/diot-monimod)<br>
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General-purpose, small form factor monitoring module for RaToPUS and 1U fan tray in radiation-exposed areas
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- [DI/OT System Board with ZU7](https://ohwr.org/project/diot-sb-zu/wikis)<br>
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A non-radiation-tolerant crate controller with Zynq Ultrascale MPSoC, White Rabbit support and Low Pin Count FMC
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- [Communication mezzanines](https://ohwr.org/project/diot/wikis/DI/Communication-Mezzanines) <br>
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A set of FMC mezzanine boards that support different communication protocols: White Rabbit and Profinet for radiation-free areas, Powerlink and WorldFIP for the radiation-exposed ones
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**Peripheral Boards:**
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The Peripheral Boards are application-specific. The DI/OT kit provides a generic SoC-based FMC-carrier Peripheral Board; the application-specific hardware is placed on the FMC-mezzanine and the software/gateware runs on the carrier SoC.
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- [DI/OT FMC carrier Peripheral Board](https://ohwr.org/project/diot/wikis/diot-fmc-carrier)<br>
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DI/OT FMC carrier
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A digital I/O module with sixteen 24 Volt optically isolated inputs and outputs has is also available for the CERN Warm Interlocks System.
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- [DIOT\_DIO\_16ch\_opt\_24V](https://www.ohwr.org/project/diot-dio-16ch-opt-24v/wiki)<br>
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Sixteen-channel digital I/O Peripheral Board
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### Documents
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- [DIOT System Specification draft](/files#diot-system-specification)
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- [DIOT project on CERN BE-CO wikis](https://wikis.cern.ch/display/HT/Distributed+IO+Tier) (CERN access only)
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- [Frequently Asked Questions](faq)
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### Papers and presentations
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**Low-Cost Modular Platform for Custom Electronics in Radiation-Exposed and Radiation-Free Areas at CERN**<br>
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[paper](http://icalepcs2019.vrws.de/papers/tuapp03.pdf) [slides](http://icalepcs2019.vrws.de/talks/tuapp03_talk.pdf)<br>
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*G.Daniluk, C.Gentsos, E.Gousiou, L.Patnaik, M.Rizzi, Proceedings of ICALEPCS2019, New York, USA*
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[Plans at CERN for electronics and communication in the Distributed I/O
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Tier](http://inspirehep.net/record/1656397/)
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*G.Daniluk E.Gousiou, Proceedings of ICALEPCS2017, Barcelona, Spain,
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ISBN: 9783954501939*
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-----
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## Contacts
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- [Greg Daniluk](mailto:grzegorz.daniluk@cern.ch) - CERN
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-----
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## Status
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|**Date**|**Event**|
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|----|----|
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|10-01-20| Created [FAQ](faq)|
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