Industry consortium
CIP Safety
A functional-safety profile layered on CIP using a black-channel approach: safety integrity is protected end-to-end with sequence numbers, timeouts and CRCs independent of the underlying network.
Carrier dependentOver EtherNet/IP or DeviceNetEncryption: No
How it works
Safety producers and consumers exchange data with safety-specific validation; a failed check drives the safety function to its defined safe state.
Communication patternSafety producer → safety consumer with per-connection timing supervision.
Fact sheet
TransportOver EtherNet/IP or DeviceNet
PortsCarrier dependent
AuthenticationSafety CRC / connection identifiers
PurdueLevel 1 (safety)
EnvironmentsSafety-rated machine control
DevicesSafety PLC, Safety I/O, Light curtain, E-stop
IndustriesManufacturing, Automotive
Why should I care?
Understanding CIP Safety is what lets you tell a routine poll from a process-affecting command. Detection here depends on knowing which peers, function codes and timings are normal for your plant.
Key functions and operations
- Safety I/O exchange
- Connection supervision
- Safe-state transition
Security concerns
- Functional safety mechanisms protect against faults, not against an authorised-looking engineering change
- Safety configuration tooling is a high-value target
- Shared media means noisy control networks can trip safety timeouts and stop production
What normal looks like
- Deterministic safety connection timing
- No configuration traffic outside maintenance
What deserves attention
- Safety configuration downloads outside change windows
- Repeated safety connection timeouts
Hunting ideas
- safety-system-anomalies
- unauthorized-plc-programming
Defensive controls
- Separate safety configuration workstations
- Alarm on any safety program change
- Engineering approval for any safety network change
Related ATT&CK for ICS techniques
T0880T0858
Sources & further reading