tel: +353-21-4313331 .....  Everything to: Sense, Measure, Connect, Communicate, Control and Automate !

     PROCESS CONTROL ---- FACTORY AUTOMATION ---- EXPLOSION PROTECTION ---- MACHINE SAFETY
Home Up Ex-equipment Bus Systems Control Panels Vision Sensors Level Sensors Flow Sensors RFID Ident System Photoelectric Sensors Inductive Sensors Ultrasonic Sensors Capacitive Sensors Wireless Control Multicolour Indicators Multifunction Indicators Audible Indicators Calibration Contact Us About... News Quality

 

Up
Light Screens
Two Hand Control
Safety Switches
Safety Modules
Emergency Stop
Rope Pull Switches
Applications
Terminology
Safety Guide

 

 

 

 

Machine Safety-
Two-Hand Control

Two Hand Control is a method of Machine Safety where both Operator's hands must be in a safe place to operate a machine. In many cases Safety Category 4 per ISO 13849-1 (EN 954-1) is required and functional Type IIIC two-hand control in accordance with European Standard  EN 574. This may be achieved using Self-Checking Touch Buttons IN COMBINATION with the corresponding Control Module.

The Self-Checking STB Buttons feature redundant microprocessor and an optical path which is broken by inserting the finger. Covers avoid attempts to use another method of actuating and both buttons must be actuated simultaneously (within half a second) to avoid tampering.

To ensure reliability, control modules have a diverse-redundant microcontroller circuit and multiple redundant, force-guided (mechanically linked) output contacts.

Anti-tiedown logic requires that both touch buttons are activated within one-half second of each other.

Optional mute inputs allow release of actuating buttons during the non-hazardous portion of the machine cycle.