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Vaccess
Unique architecture provides speed, ease of use, and room for growth. The cornerstone of the Vsystem architecture is Vaccess, a user-extendable, real-time database and library of access routines. Vaccess is similar in structure to an electronic crate--like a VME crate--into which you can plug a variety of modules. While individual modules interact with Vaccess, they are independent of each other. Vaccess holds and transmits data and functions as an event-driven bus, providing notification of change upon request.

Vaccess maintains a responsive, secure, memory-resident data description of your facility. From ASCII text files, Vsystem generates a real-time database customized for your facility. You can divide the database into many databases distributed among the computers of the system. Security can be controlled per database or per channel. In a distributed, networked environment, although a database resides on only one computer, all other computers in the network have access to that single copy. Optionally, events generated from that database update remote applications with significant changes, ensuring efficient use of computing resources.

And you can construct systems from small, easily defined, tested modules. In essence, Vsystem breaks complexity down into manageable pieces.

Benefits of this unique architecture:

  • Speed, manageability, security, and scalability

  • High performance and memory resident

  • Channel types: binary, integer (8-, 16-, and 32-bit; signed/unsigned), single-precision floating-point, double-precision floating-point, string (232 characters), and time (resolution 1 ns)

  • All channels can be time stamped

  • Numeric channels can be arrays up to 232 bytes

  • Array channels can be circular buffers; each value can optionally be time stamped

  • Each database can have up to 65,535 channels

  • Up to 65,535 databases in a system, with any number on each computer

  • Alarming with delayed alarms and with reference alarms

  • Full API

  • Event-driven change notification on all fields

  • Dynamic memory management

  • User-written conversion routines with parameters

  • Conversion routines can do gets and puts

  • Multiple conversion routines per channel

  • User-written I/O routines

  • Most fields are dynamically changeable

  • Channels can be added dynamically to a running system

  • All releases intercommunicate - no need to upgrade your old system when a new system is added

  • 256 alarm priorities

  • Database, channel, and field security

  • Database checkpoint manager to ensure that disk copy is current in case of failure

  • Area and subarea fields supported for larger applications

Updated Mar 31, 2006