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# VMR-DIO-24CH-DCI project
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## Project Description
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### Overview
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*CANCELLED PROJECT***
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The aim of this project is to distribute dry contact input signal states
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across a wide geographical area, using an Ethernet-based [White Rabbit
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(WR)](https://www.ohwr.org/project/white-rabbit/wiki) network.
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The proposed hardware system will acquire these input signals using a
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rear transition module or RTM. Transmission through the network will be
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managed by the exisiting [SVEC](https://www.ohwr.org/project/svec/wiki)
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board.
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Development of necessary SVEC Gateware is in the scope of this
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project.
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-----
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## Proposed system architecture
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![](/project/vmr-dio-24ch-dci/uploads/cf4d1fed3095ffe9543a454b23c83b05/systemdiagram02.png)
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A block diagram of the proposed system is shown above.
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- Rear transition module or RTM, (See [hardware
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project](https://www.ohwr.org/project/vmr-dio-24ch-dci-hw)).
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- RTM input panel includes visual (LED) diagnosis.
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- RTM connected to the [SVEC
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board](https://www.ohwr.org/project/svec/wiki) via VMC P2 port.
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- Communication via [White
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Rabbit](https://www.ohwr.org/project/white-rabbit/wiki) managed by
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the [SVEC](https://www.ohwr.org/project/svec/wiki).
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- New [Gateware](https://www.ohwr.org/project/vmr-dio-24ch-dci-gw) for
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SVEC RTM read, SVEC to WR (Tx) and WR to SVEC (Rx).
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-----
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## Functional description of system components
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[For the RTM](https://www.ohwr.org/project/vmr-dio-24ch-dci-hw/wiki)
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- LEMO 2-pin connector for dry contact inputs (DCIs).
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- 24VDC power supply, complying with industrial environments
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standards.
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- Input protection against voltage spikes or power surges.
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- Diagnostic tools to detect faulty inputs: LEDs for visual ON/OFF
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diagnosis.
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- Robust fail safe operation: The rest of the system needs to be aware
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of failure of any of the components in the acquisition chain.
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- No stringent timing requirement, as input required every ~ 1s.
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For the SVEC
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- Host the RTM:
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- Detecting its presence and power status.
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- Reading out the dry contact input states in one of the 40
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user-defined inputs of the VME P2 port.
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- Transmitting signals:
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- Send the dry contact input states in the form of Ethernet
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packets.
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- Design decisions will be made on whether transmission is
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synchronous or asynchronous (transmit periodically or only upon
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status change).
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- Connect to VME host processor:
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- Manage a control data path which will be used for network
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diagnosis (determine LIVE node status).
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- Receive gateware upgrades.
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- Manage and safeguard WR node identity and location in the event
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of hardware replacement.
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-----
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## Project Information
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This project is divided into three separate projects:
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- [Hardware
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project](https://www.ohwr.org/project/vmr-dio-24ch-dci-hw/wiki)
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- [Gateware
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project](https://www.ohwr.org/project/vmr-dio-24ch-dci-gw/wiki)
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- [Testing
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project](https://www.ohwr.org/project/vmr-dio-24ch-dci-tst/wiki)
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Project documentation can be found at these locations:
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- Current projected timeline can be found
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[here](https://www.ohwr.org/project/vmr-dio-24ch-dci/wikis/Documents/Project-timeline).
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- [CERN-specific information](cern-specific)
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- [Frequently Asked Questions](faq)
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-----
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## Status
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<table>
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<tbody>
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<tr class="odd">
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<td><b> <strong>Date</strong> </b></td>
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<td><b> <strong>Event</strong> </b></td>
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</tr>
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<tr class="even">
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<td>2011</td>
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<td>Initial discussions about replacing the external conditions system</td>
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</tr>
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<tr class="odd">
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<td>01-10-2015</td>
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<td>Start working on project.</td>
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</tr>
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<tr class="even">
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<td>05-11-2015</td>
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<td>OHWR project page created.</td>
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</tr>
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<tr class="odd">
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<td>09-06-2016</td>
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<td>Project cancelled. No need anymore at CERN.</td>
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</tr>
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</tbody>
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</table>
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-----
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Denia Bouhired-Ferrag - Erik van der Bij - 22 August 2016
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