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Holt Systems

Controls retrofits and PLC migration

Planned migration of obsolete PLC platforms, including Siemens S7-300, Allen-Bradley SLC 500 and PLC-5, to current hardware, delivered at a fixed price.

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Operator touchscreen panel mounted on an industrial production machine

Overview

Many sites continue to rely on PLC platforms that their manufacturers have moved to phase-out or discontinued status. As spares become scarce and platform expertise declines, a single hardware failure can result in an extended unplanned outage.

A planned migration transfers existing control functionality to a current, supported platform, with complete documentation, at a time that suits production rather than in response to a failure.

Typical applications

  • Siemens S7-300 and S7-200 systems
  • Allen-Bradley SLC 500, PLC-5 and MicroLogix systems
  • Legacy operator interfaces (HMIs) that can no longer be replaced like for like

Industries

The process in three steps

  1. 1

    Audit and document

    The existing program is backed up and all inputs, outputs, interlocks and sequences are documented.

  2. 2

    Convert and test

    Control logic is converted to the new platform and tested against existing behaviour off-site.

  3. 3

    Cutover

    The new system is installed during a scheduled shutdown, with the existing system retained as a fallback until the new system is proven.

Discuss your requirements

Following a site assessment, we provide a fixed-price proposal with the projected benefit set out alongside the cost.

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