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ConnectorControl & actuation

PLC Command Bridge

Reference bridge for vetted line-controller commands with bounded duplicate suppression and local safeguards.

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About

The PLC Command Bridge writes to programmable logic controllers over the protocols they already expose, typically Modbus TCP registers and coils or OPC UA writable nodes. Every writable target is declared up front with its type, bounds, and meaning; the connector will not touch an address it was not given. Commands are single-flight per controller and carry idempotency keys, so a network retry lands as the same instruction, not a second one.

This reference connector excludes safety-system authority. A real deployment must enforce certified local interlocks, allow-listed bounds, human approval, and fail-closed behavior outside the model. Managed early access does not establish that every command is recorded or safely reversible.

Highlights

  • Sends vetted commands to line controllers
  • Idempotent by key
  • Writes use idempotency keys and single-flight controls to suppress duplicate effects on retry
  • Provisioned with a deployment engineer through the early-access program
Kind
Connector
Category
Control & actuation
Publisher
Fibric
Availability
Early access
Delivery
Managed by Fibric; nothing to install
Data direction
Reads and writes
Pricing
Early access
Sold by
Fibric
Support
Developed and supported by Fibric
Tags
industrial, actuation, line, hardware

Authentication

Uses the security of the underlying path: network-layer scoping for Modbus TCP targets, X.509 certificate trust for OPC UA targets, plus Fibric's declared write allow-list.

What it reads

  • Current values of the declared writable targets, read back before and after each command
  • Controller reachability and mode, as a precondition for any write
  • Command outcomes: applied, rejected, or timed out, per receipt

What it can do

  • Write a declared register, coil, or node to a value within its bounds, propose-only to start
  • Reset or acknowledge a declared flag as part of a vetted plan

How it works

1

Sense

Current values of the declared writable targets, read back before and after each command.

2

Reason

Operators reason over this connector's signals next to the rest of your stack, so decisions are grounded in the same records you run on.

3

Act

Target capability: Write a declared register, coil, or node to a value within its bounds, propose-only to start. Actual authority, duplicate controls, and recovery depend on the validated deployment and downstream system.

Pricing

Managed early access

This listing is informational and not self-serve. A deployment review must validate the connector, credentials, action boundary, recovery path, support, and contractual pricing before use.

Deployment engineer
Wires and verifies the integration with you during onboarding
Managed validation
Review maturity, authority, supported records, and deployment boundaries before go-live
Execution records
Supported reads, proposals, policy decisions, and reported outcomes kept for review
Support from the builders
Developed, run, and supported directly by Fibric

Requirements

System requirements
  • IP reachability to each controller over Modbus TCP or OPC UA
  • A declared write map: address, type, bounds, and meaning for every writable target
  • Sign-off that no safety-instrumented targets are in scope

Your deployment engineer verifies each line with you during onboarding.

Support and resources

Supported by the people who built it

This connector is developed, run, and supported by the same Fibric team. Support starts during onboarding with a named deployment engineer and doesn't hand you off afterward.

Works with

Listings this is designed to pair with. Each listing has its own live or managed early-access state.

Operator by Fibric

Exception Routing

A managed early-access pattern for identifying line exceptions and proposing reroutes, reschedules, or reviewed dispatches.

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Operator by Fibric

Predictive Maintenance

A managed early-access pattern for reviewing supported telemetry and proposing a maintenance work order before a suspected fault worsens.

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Sensing & telemetry connector

Modbus TCP

Talks to the meters, drives, and PLCs that already run your plant, polling registers on a schedule and normalizing the readings.

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Sensing & telemetry connector

OPC UA

The industrial standard for shop-floor data: browses the address space, subscribes to nodes, and keeps the model in sync.

View details

Support & comms connector

Slack

Posts the proposed action, waits for the human confirm, then executes, all inside a channel that keeps the record.

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Bring PLC Command Bridge into your early-access deployment

Early access means a deployment engineer wires this with you, and it runs propose-only until you approve live actions.