Critical infrastructure operates on a different timeline.
Bridges, ferry terminals, navigation systems, public facilities, and other large-scale assets may remain in service for decades. Their control systems must reliably coordinate mechanical equipment, electrical systems, instrumentation, communications, and operator controls through changing technology and operating conditions.
Systems Interface designs, integrates, modernizes, and supports automation systems for complex infrastructure where reliability, predictable operation, and long-term maintainability matter.
Infrastructure automation often sits at the intersection of heavy mechanics, power systems, safety systems, communications, and precision motion.
A movable bridge is not simply a motor connected to a PLC. Large structures introduce stored mechanical energy, high-inertia and overhauling loads, braking requirements, complex interlocks, long travel paths, and abnormal operating conditions that must all be accounted for by the control strategy.
Systems Interface brings those disciplines together into coordinated control architectures designed around the behavior of the asset itself.
That experience extends to systems involving:
Moving large structures predictably requires more than standard machine control.
Systems Interface engineers control strategies for applications involving high-inertia equipment, gravity-driven overhauling loads, coordinated multi-axis motion, controlled deceleration, interlocks, permissives, fault sequencing, and recovery logic.
The goal is predictable system behavior during normal operation and clear control when conditions are anything but normal.
Many infrastructure systems outlive the technology originally used to control them.
PLCs become obsolete. Drives reach the end of their supported life. Networks change. Operator interfaces become difficult to maintain. Documentation may reflect decades of modifications.
Replacing the control system, however, does not mean replacing the infrastructure it serves.
Systems Interface evaluates the existing environment, identifies modernization priorities, and develops migration strategies that account for the equipment, operational requirements, available maintenance windows, and long-term needs of the asset.
Systems Interface supports infrastructure projects with capabilities including:
For movable bridges, SII also provides electrical and mechanical inspection services covering control systems, drives, motors, gearboxes, brakes, safety circuits, instrumentation, operational performance, and system condition.
Infrastructure experience is difficult to demonstrate with a list of capabilities alone.
SII's work includes transportation systems, movable bridges, federal facilities, and nationally significant navigation infrastructure.
Systems Interface supports Washington State's SR 520 Evergreen Point Floating Bridge, the world's longest floating bridge. The structure uses 25 pontoon sections and approximately 1,600 float cells, creating a complex infrastructure environment requiring dependable controls and long-term support.
Systems Interface contributed to the control systems supporting Washington State Ferries' Mukilteo terminal, which opened in 2020. The project demonstrates SII's experience working within complex public transportation infrastructure where multiple systems must operate together reliably.
When Seattle's South Park Bridge was replaced, the new drawbridge required a modern drive control system capable of supporting safe and reliable bridge movement. Systems Interface provided control expertise for the movable structure, applying its experience with drives and heavy-motion applications.
As the subcontracted system integrator for Phase 3 of the New Lock at the Soo project, Systems Interface is helping finalize the design and integrate a multi-vendor OEM control system for one of North America's most important navigation corridors.
SII's work includes ship arrestors, miter gates, Tainter valves, pump wells, electrical power systems, and the main control system. The engineering team is supporting design, programming, startup, installation, and implementation, while SII's manufacturing team is building 41 custom control panels for the project.
Systems Interface supported the replacement of aging boiler control benchboards, auxiliary controls, and operator consoles at a shipyard facility. Working with project partners, SII provided engineering through installation, training, and commissioning, including new hardware, software, control panels, servers, workstations, and monitoring systems.
Infrastructure does not get replaced every few years.
That changes how control systems should be engineered.
Maintainability, documentation, standardization, component lifecycle, diagnostics, and future modernization all matter because the people supporting the system ten or twenty years from now may not be the people who designed it.
Systems Interface brings more than 40 years of industrial automation experience to that challenge, designing systems around both the requirements of today and the realities of long-term operation.
SII has experience with movable bridges, ferry infrastructure, navigation locks, heavy movable structures, power systems, distributed infrastructure, and other complex control applications.
Yes. Legacy modernization is one of SII's core capabilities. The approach depends on the existing equipment, operational requirements, available shutdown windows, and long-term needs of the asset.
Yes. SII has experience with bascule, lift, swing, and floating bridges, navigation systems, ship arrestors, and other applications involving heavy motion, high-inertia equipment, and overhauling loads.
Yes. Complex infrastructure frequently includes equipment and controls from multiple vendors. Systems Interface designs and integrates coordinated control architectures across new and existing equipment, including multi-vendor systems.
Yes. SII provides engineering support, troubleshooting, modernization, remote diagnostics, field service, inspections, system modifications, and lifecycle support.
Some automation projects can be solved with a standard architecture.
Critical infrastructure usually cannot.
Every asset brings its own mechanical behavior, operating requirements, history, constraints, and risks. Systems Interface approaches those projects by understanding the entire system first, then engineering controls around the realities of how it needs to operate.
Whether you're planning a new system, modernizing an aging asset, evaluating existing controls, or facing an operational problem that doesn't have an obvious solution, start with the engineering conversation.