OSHA Danger This Machine Automatically Controlled It May Start At Any Time Sign Stickers

This sign warns workers that the machine is operated by an automatic control system such as a PLC, remote controller, or automated program and can therefore activate at any time without a local operator present. Workers may incorrectly assume a machine is safe to approach when they see no one operating it, when in fact it is under remote or automatic control and can start without any visible cue.

A machine that "starts automatically" activates on a timer or sensor. An "automatically controlled" machine emphasizes that the control source is remote or programmatic meaning neither the machine nor a visible operator determines when it starts. OSHA 29 CFR 1910.147 specifically addresses this distinction because both types require lockout/tagout during maintenance.

Post on the machine control panel, on all service and maintenance access doors, and at any point where workers may approach. This sign is especially important for machines in unmanned areas, remote-controlled equipment, and PLC-driven systems where the absence of a visible operator may create a false sense of safety.

Yes. This sign supports compliance with OSHA 29 CFR 1910.147 (Control of Hazardous Energy / Lockout Tagout), which specifically identifies automatically and remotely controlled machines as equipment requiring lockout/tagout before servicing. The sign communicates the automatic control hazard at the point of risk, reinforcing your written lockout/tagout program.

Danger is appropriate under ANSI Z535.4 when automatic machine activation presents an immediate risk of death or serious injury which applies to most industrial automatically controlled equipment. For lower-risk automatic equipment, Warning or Caution may be appropriate based on your hazard assessment.