VMR-DIO-24CH-DCI project
Project Description
Background
The aim of this project is to distribute dry contact input signal states
across a wide geographical area, using an Ethernet-based White Rabbit
(WR) network.
The design of the hardware board which will acquire these input signals
will be covered. Transmission through the network will be performed by a
different board, the SVEC),
as well as the necessary gate will be covered
here.
Main Requirements
- LEMO 2-pin connector for dry contact inputs (DCIs).
- 24VDC power supply, complying with industrial environments standards.
- Input protection against voltage spikes or power surges.
- Diagnostic tools to detect faulty inputs: LEDs for visual ON/OFF diagnosis.
- Robust fail safe operation: The rest of the system needs to be aware of failure of any of the components in the acquisition chain.
- No stringent timing requirement, as input required every ~ 1s.
Proposed system
A block diagram of the proposed system is shown above.
- 12 input channels, motivated by
> * Geographical signal-to-node allocation considrations.
> * From the hardware point of view, LEMO connectors will soldered on the RTM directly, with no requirement for an extension board (piggyback). - Rear transition module or RTM, (See hardware project).
- RTM connected to the SVEC board via VMC P2 port.
- RTM i/p panel includes visual (LED) diagnosis.
- Connect to White Rabbit via SVEC SFP port.
- New Gateware for SVEC RTM read, SVEC to WR (Tx) and WR to SVEC (Rx).
Project Information
This project is divided into three separate projects:
Project documentation can be found at these locations:
- Current projected timeline can be found here.
- CERN-specific information
- Frequently Asked Questions
Status
Date | Event |
2011 | Initial discussions about replacing the external conditions system |
01-10-2015 | Start working on project. |
05-11-2015 | OHWR project page created. |
Denia Bouhired-Ferrag - Erik van der Bij - 12 Novembre 2015