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Integration of Motion Control, Chopper and Sample Environment into Instrument Architecture

This workshop discusses the integration of motion control, chopper, and sample environment systems into instrument architecture, including time stamping methods and connections to EPICS for enhanced control and monitoring.

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Integration of Motion Control, Chopper and Sample Environment into Instrument Architecture

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  1. Integration of Motion Control, Chopper and Sample Environment into Instrument Architecture Thomas Gahl (EEG) Workshop on Instrument Architecture, 2013-06-14

  2. Three Assumptions first • Devices are local systems with locally closed control loops (due to speed and precision of the control process) and locally handled alarm/interlock features • Devices will connect to EPICS: Receiving commands from and sending status information (metadata) to EPICS • All metadata have to be read out regularly and time stamped with the absolute facility time Workshop on Instrument Architecture, 2013-06-14

  3. Time stamping • On the control of local devices 4 different types of time stamping are possible according to the latency requirements • T1: read out metadata through TCP/IP or RS232, time stamped in the control box (latency few hundreds of msec) • T2: Synchronizing the periodical reading of metadata in the controller with a pulse from the timing system (latency few msec) • T3: Importing absolute time to Controller and time stamping there (latency well below 1 msec) • T4: Direct reading of metadata (from sensor) into the control box and time stamping there (latency well below 1 msec) Workshop on Instrument Architecture, 2013-06-14

  4. Motion Control • Motion Control Unit is connected to the Control box through TCP/IP for commands and readings • On motion control all 4 different types of time stamping might be applicable to fulfill the latency requirements derived from the required precision and the used speed • Read out of positions through TCP/IP, time stamped T1 in the control box • Synchronizing a periodically reading of positions with a pulse from the timing system, time stamping T2 • Importing absolute time to Motion Control Unit with time stamping T3 • Direct reading of encoder position into the control box with time stamping T4 Workshop on Instrument Architecture, 2013-06-14

  5. Chopper • Chopper control includes set and read of speed and phase via TCP/IP or RS232 and synchronizing to the pulse of the source (time stamping T1) • There might be analog signals to read to analyse the status of the magnetic bearings control (time stamping T4 in the control box) • Sensors including vacuum and cooling may be also red in directly into EPICS (time stamping T4) Workshop on Instrument Architecture, 2013-06-14

  6. Sample Environment • Digital and (fast) analog signals can be connected directly to cards in the control box (time stamping T4) • Processes in SE are in most cases slow, so controllers are connected to EPICS via TCP/IP or RS232 and metadata is time stamped in the control box (T1) • There might be a direct reading of the sensors into EPICS as well (time stamping T4) Workshop on Instrument Architecture, 2013-06-14

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