MICRONOR
automation components
Page 5 of 25
1.
Product Description
1.1.
Fiber Optic Emergency Stop Switch
Figure 1. MR380 Series Fiber Optic Emergency Switch & MR380 Series Controller
The MR380-2 Emergency Stop Switch paired with MR380-1 series Controller provides a new,
innovative emergency signaling detection that can be deployed in hazardous environments
and over very long distances. The Fiber Optic E-Stop switch employs a photo interrupt scheme
operating over a duplex 50/125µm or 62.5/125µm optical link that allows for reliable signal
detection and implements a known default failure state.
The optical signal levels are rated inherently safe
Ex op is
, allowing the system to be safely
deployed in any type of explosive atmosphere or hazardous location. The entire fiber optic
sensor system has a generous system loss budget, allowing for long distance, complex
routing, and daisy chaining of multiple switches.
Depressing the switch interrupts the optical signal and the Controller provides both Double
Pole Double Throw (DPDT) relay contacts and digital outputs for signal and control. The
controller will indicate if there is a broken fiber connection or depressed switch in the system
which provides increased safety margin over electrical emergency switches. The controller will
always default to the emergency state when: the switch is depressed, in case of a broken
fiber, in case of a fiber being disconnected or loss of power to the controller unit.
Figure 2 provides a complete functional overview of the emergency switch system.
