muono
ReferenceSecurity specification
Revision AStatus Per connector

Control-system access

For your IT and OT reviewers
Purpose

What Muono reaches, agreed per connector.

This is the clause an OT gatekeeper reads first. Muono does not assert a single posture for every site, because the honest answer depends on the connector and on what your policy permits. What is fixed is that the posture is written down and signed before a connector is enabled.

Default posture

Historians, maintenance systems and document stores are read on a schedule you set. Reading is the normal mode of operation and covers the large majority of what Muono does.

Read on your schedule

Anything beyond reading

Scoped, documented and signed before it is enabled, per connector, naming what it may touch and under whose authority. There is no global write switch and no default that reaches further than the document says.

Scoped in writing

Control systems specifically

Whether Muono connects to a DCS, PLC or SCADA layer at all is a site decision. Many deployments never go below Level 3 and read the process historian instead. Where a direct connection is in scope, it is agreed with your OT team and constrained to the tags named in the document.

Site decision not a default

Segregation

The collector sits where your network design says it should, normally in the DMZ at Purdue Level 3.5, and it initiates outbound connections only. Nothing inbound is accepted. No route is required from the internet to Level 2 and below.

Outbound only

Agents and action

An agent proposes work in your systems, whether a work order, a notification or a document, and the authority level your team sets decides whether it drafts, submits or waits for a named approver. Irreversible actions hand off to a person by design.

See authority levels

If your answer is no

Some operators will not permit anything past the historian. That is a workable deployment, and we would rather scope it that way than negotiate the boundary during a pilot.

Workable as read-only

Bring your connector list to the review.

Going through it one line at a time is the fastest way to establish whether Muono clears your policy.