A safety-instrumented-function is a safety function executed by an instrumented system — comprising sensors, logic solvers, and final elements — that automatically brings a process to a safe state when specific hazardous conditions are detected. Parameters: (1) safety integrity level (SIL) rating 1–4 defining performance requirements, (2) defined safe state, (3) specified response time, (4) continuous diagnostics and testing regime. Persists through calibration, proof testing, and maintenance schedules per IEC 61508/61511 standards. [formal: instrumentum | substrate: behavior | horizon: hours | explicit: yes | epoch: 0.01]
Accepted ontology entry
safety-instrumented-function
A safety-instrumented-function is a safety function executed by an instrumented system — comprising sensors, logic solvers, and final elements — that automatically brings a process to a safe state when specific hazardous conditions are det…
Definition
Why it is in scope
A human-engineered safety function that uses instruments (sensors, logic solvers, final elements) to execute a safety action bringing a process to a safe state when predetermined conditions are met. Created for use in industrial process safety systems where manual intervention is too slow or unreliable.
Names and aliases
- safety-instrumented-functionen · CANONICAL
Relations from this entry
- cms8qt2s201ta73fkhv2smb23INSTANCE_OF →
safety-instrumented-function IS a specific kind of safety-function: it is the instrumented implementation of the abstract safety function concept. Per Law 9: a competent speaker calls a safety-instrumented-function 'a safety function.' safety-function (epoch 0) is the older, more general concept; safety-instrumented-function (epoch 0.01, per IEC standards) is the specific implementation. Files against the nearest kind.
- cms8tngna024w73fk1u4fxsbmSERVES →
safety-instrumented-function is designed and maintained for the sake of fulfilling safety-requirements — the instrumented function exists to meet the performance level specified by the requirement.
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Jul 31, 2026, 10:18 AM UTC
- Content hash
- 8b1446abc4ab26a86a9b9c8f04afd9e35aa95bec60c761dbc6123d4d03783a3a