ELMB PSU Introduction

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1 ATLAS DCS ATLAS DCS Document Document ID: ATLAS-DQ-ON-0025 Document Date: Document Status: In Work Institutes and Authors: CERN: J. Cook In Work page 1

2 ATLAS DCS Table of Contents 1. Introduction Description of the PSU...3 Hardware Setup...3 Connecting more than one ELMB PSU Crate on the same bus...4 Terminators ELMB PSU Crate Framework Component...4 Creating a Crate...5 Creating a Branch...6 Operating Channels/Branches...7 page 2 In Work

3 ATLAS DCS 1. Introduction This document gives information about the ELMB Power Supply Unit (PSU) that has been initially designed by ATLAS and has been produced by the PH-ESS group. The PSU is used to provide power to ELMBs remotely via the CAN bus, allows for software control of the power (on or off) and allows for the current and voltage to be monitored. A JCOP Framework component has been developed to allow for easy integration of the control for the PSU into PVSS. 2. Description of the PSU Information on the hardware for the ELMB PSU may be found at the link below to the PH-ESS group web-page: Information regarding recommendations for the branch connection scheme may be found at the link below to a document held in EDMS: Hardware Setup Figure 1 shows an ELMB PSU Crate as if made up of discrete components (ELMBs and powers supplies). PC containing CAN interface card Branch 1 Branch 2 D-Type connector CAN bus for CTRL D-Type connector D-Type connector Power Supply Digital Output Line ELMB_CTRL Digital Output Line Power Supply Burndy connector ELMB PSU Crate Burndy connector ELMB_01 ELMB_01 ELMB_02 ELMB_02 ELMB_03 ELMB_03 ELMB_nn ELMB_nn Figure 1: ELMB PSU Crate described as discrete components Power may be given to each of the controlled CAN buses independently of each other. There is an ELMB inside the PSU (in Figure 1 this is labeled as ELMB_CTRL) that uses the digital output lines (ports A and C) to control whether the power is switched on or off for a branch. In Work page 3

4 ATLAS DCS Only two controlled buses (branches) are shown in Figure 1 though the ELMB PSU may control and monitor the power for up to 16 CAN buses. The CAN bus labeled as CAN bus for CTRL is independent of the controlled branches, both for powering and communication (i.e. a separate CAN interface port must be used on the PC). Figure 1 does not show power being given to the controlling ELMB (ELMB_CTRL). The power for this ELMB is supplied internally by the PSU (as long as the PSU Crate itself has power!). Connecting more than one ELMB PSU Crate on the same bus More than one ELMB PSU Crate may be connected on a single bus. There are a few important points that need to be taken into account if this is done. The control ELMB inside the PSU has a default node ID of 63 (0x3f). If more than one crate is connected to the same bus, remember to change the node IDs to ensure that all crates are unique. The default baud rate set on the ELMBs inside the PSU is 125 Kbaud. It is advisable to only have ELMB PSU Crate devices on a bus. That is, do not connect other CAN/CANopen devices to the same bus (whether they are other ELMBs or not). There is a switch on the back-plane of the crate which allows for the power that supplies the internal ELMB to be isolated from that CAN bus. With more than one crate on a bus, you must ensure that this switch is set as Isolated (and not Connected ). Terminators For a CAN bus to operate correctly, both ends of the bus must be terminated with a 120 ohm resistor. The modules that give power to the controlled branches have terminators built in, but these can be disconnected if required. A jumper is located within the modules that control the use of the built in terminators for the controlled branches. The connectors for the jumpers are marked ST1 and ST2. If the jumper is across the respective connector, then the terminator for that branch is connected. If the CAN bus is long between the PC and the crate compared to the full length of the CAN bus (including the powered part), you may need to disconnect the built in terminators. If you find you have communication problems with the ELMBs on a controlled branch, try disconnecting the built in terminator for that branch and connect a terminator to the end of the CAN bus close to the PC. No terminations are supplied for the bus which connects to the controlling ELMB(s). You must connect your own terminators to this bus. 3. ELMB PSU Crate Framework Component A framework component for the ELMB PSU Crate has been developed for use with the JCOP framework. As an ELMB is used to control and monitor the power for the page 4 In Work

ATLAS DCS branches, and to maximize re-use of already developed panels and functions, the ELMB framework component is used to supply much of the functionality required by the ELMB PSU component.

5 ATLAS DCS branches, and to maximize re-use of already developed panels and functions, the ELMB framework component is used to supply much of the functionality required by the ELMB PSU component. For this reason, the ELMB component must be installed in your project before attempting to install the ELMB PSU component. The ELMB PSU component is available for download from this link: The installation procedure is not described here. For details on this, please consult the link below: The following sections give a brief description of the ELMB PSU framework. It is assumed that you have already installed this component and any dependencies. Creating a Crate Before any controlled branches may be created, the higher level device (the ELMB PSU Crate) must be created. When a crate is created, the ELMB framework functions are used to actually create an ELMB (which may be viewed in the Device Editor & Navigator Hardware View under the ELMB tree node). The crate (and therefore the ELMB) may be created on any existing CAN bus in the project or, the panel allows for a new CAN bus to also be created. Figure 2 shows the ELMB PSU framework panel that allows a crate to be created. Figure 2: ELMB PSU framework panel to create a Crate If you have already created CAN buses and ELMBs in your project, you may use these, or you can create them from this panel. In Work page 5

6 ATLAS DCS If you have already created input sensors on an ELMB, this cannot be used as an ELMB for a crate. All analog input channels and all digital outputs are used for the monitoring and control of the crate and so only empty ELMBs may be used. Once you have selected the bus that the PSU Crate will be connected to, and the ELMB that is inside the crate, you may then create the crate device itself. Remember that the bus the crate is connected to is not controlled or monitored by the ELMB PSU framework component. This bus is used purely to communicate with any controlling ELMB(s) that are inside the crate(s). Creating a Branch Branches may now be created on this bus. A branch is also a CAN bus, but the difference is that the ELMB PSU can be used to control whether power is on or off for the branch and the current and voltage on the branch may be monitored. Figure 3 shows the ELMB PSU framework panel that allows branches to be created on a crate. Figure 3: ELMB PSU framework panel to create Branches When a branch is created using the framework, the ELMB framework functions are used to actually create ELMB analog input sensors and a digital output line for the the specific ELMB node (which may be viewed in the Device Editor & Navigator Hardware View). The branches have a numbering scheme that starts with zero at the top left, and the branch number increases from top-to-bottom, then left-to-right. See Figure 4 to see how the numbering of each branch is applied. Any number of modules may be inserted into the crate up to the maximum number of 8 modules. Each module has two channels, and each channel controls a branch. The top channel (or branch) of a module is assigned as Position A and the bottom channel/branch is assigned as Position B. page 6 In Work

7 ATLAS DCS Each module is also given a slot number, starting at 0 (zero) from the left, up to slot 7 on the right. The position, slot and channel/branch numbers are fully detailed in Figure 4. The slot number and position letter are partly from historical reasons, but may also aid recognition of the respective channel/branch. The CAN bus that is controlled and monitored by this branch may be selected at the time of creation, or may be assigned later. Operating Channels/Branches Figure 4 shows the ELMB PSU framework panel used for operating/controlling and monitoring the individual channels/branches that have been created. Slot 0 Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 6 Slot 7 Position A (Top) Position B (Bottom) Figure 4: ELMB PSU framework panel for control and monitoring of Branches As can be seen in Figure 4, branches do not have to be created in any particular order when using the ELMB PSU framework. You may create whichever channels/branches that you require, though obviously, if the module (the hardware itself) has not been placed into the crate for a channel/branch you have created, no control will be possible and the monitored values will be meaningless. Buttons are available on this panel to allow actions to be taken on all channels/branches. In order not to crowd this panel with buttons, many operations are only available with a right-click on various objects. For example, Figure 5 shows the commands available when right clicking on one of the burndy connector symbols for a channel/branch. In Work page 7

8 ATLAS DCS Switch ON Switch OFF Show States Send Command Figure 5: Example of right-click to obtain command options From this pop-up menu, the individual branch may be controlled. Options currently available are to switch power off or on, or to send a Network ManagemenT (NMT) message to the controlled bus to Start (set Operational), Stop or Reset the all ELMB nodes on the bus. Please see the online help for a full description of all commands and from which objects these commands are available. The online help is available from clicking the button at the top-right of the panel (showing the icon of a book with a question mark). page 8 In Work

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