For improved reliability of the emergency stop circuit. 

Features & Benefits

• Can detect the on/off and wire-breaking status of tape switches, edge switches, bumper switches,or mat switches which are used in combination with this interface controller.
• Employing a self-holding output system, the interface controller can detect instantaneous wire-breaks and switches and holds the output state.
• The interface controller can be installed on a DIN rail or secured on the attached plate with screws.
• The following two functions are selectable:
  – Self-holding function: The output state is switched upon detection of a contact between switch contacts (Direct output function is also selectable).
  – Wire break detecting function: The output state is switched upon detection of wire break, even though instant wire break (Applicable for 4-wire system switches and terminating-register-integrated switches only). 
  – Direct output function: The output state is switched only whena contact between switch contacts is detected (connecting the DM pin to the ground pin).
• There are two output functions. The output is generated from a relay contact.
  – Main output: The output state is switched upon detection of a contact between switch contacts or a wire break (c contact: NO/NC terminal display is the status “Power off time”). 
  – Wire-breaking detection output: Detecting wire-breaking and switching output from on to off status (b contact: Self-holding function only). 

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Tokyo Sensor Brochure