Intended use

The TwinSAFE terminals expand the application range of Beckhoff Bus Terminal system with functions that enable them to be used for machine safety applications. The TwinSAFE terminals are designed for machine safety functions and directly associated industrial automation tasks. They are therefore only approved for applications with a defined fail-safe state. This safe state is the wattless state. Fail-safety according to the relevant standards is required.

The TwinSAFE Terminals enable connection of:

• 24 V_DC sensors (EL1904) such as
  emergency off pushbutton switches, pull cord switches, position switches, two-hand switches, safety mats, light curtains, light barriers, laser scanner, etc.
• 24 V_DC actuators (EL2904) such as
  contactors, protection door switches with tumbler, signal lamps, servo drives, etc.

Test pulses When selecting actuators please ensure that the EL2904 test pulses do not lead to actuator switching or diagnostic message from the EL2904.

The following modules were developed for these tasks:

• The EL1904 terminal is an input module with digital inputs.
• The EL2904 terminal is an output module with digital outputs.
• The EL6900 terminal is a logic module.

These modules are suitable for operation with

• Beckhoff EKxxxx series Bus Couplers
• Beckhoff CXxxxx series Embedded PCs with E-bus connection