Direct answer: GuardLink replaces a bundle of point-to-point safety wires with a single 4-conductor daisy chain, trading wiring labor and richer diagnostics for the plain simplicity of discrete wires. It wins on multi-device cells and frequent layout changes, but hardwired still beats it for a single fixed device.
GuardLink vs hardwired, side by side
Wiring: one cable versus a harness
GuardLink runs safety devices on a single daisy-chained cable, so adding a gate or E-stop is one tap instead of a home-run back to the relay. Hardwired safety needs point-to-point cables for every device, which grows fast in device count and cabinet space.
Diagnostics: guess versus point-to-point
GuardLink reports which device opened and why, down to the node on the chain, so a fault is a named location instead of a guess. Hardwired wiring tells you only that the circuit dropped, leaving you to walk the harness.
When hardwired still wins
Hardwired stays the better pick for a handful of devices, a cost-sensitive job, or a site that will not maintain a safety network. Below a few gates the wiring savings of GuardLink do not justify the module cost and the need for a compatible safety controller.
Selection checklist
- More than 8 safety devices, or layout changes often? → GuardLink
- A single fixed device, low count, never moves? → Hardwired
- Need node-level diagnostics from the controller? → GuardLink
Both approaches feed the same safety and security architecture; paired with safety relays or safety gate switches, GuardLink simply changes how the devices reach the controller.
GuardLink FAQ
Does GuardLink replace the safety relay?
No. GuardLink is the safety communication link between devices; you still need a safety relay or, more often, a safety PLC that understands the GuardLink telegram to make the stop decision. It removes the wiring, not the logic.
Is GuardLink proprietary to one vendor?
GuardLink is Rockwell's open safety protocol, and third-party devices with GuardLink interfaces exist, but the ecosystem is centered on Allen-Bradley safety controllers. If you mix brands, confirm the controller supports GuardLink before committing.
