Integrated safety
EL72x1-901x176 Version: 1.9
6 Integrated safety
6.1 Safety regulations
WARNING
Caution - Risk of injury!
Electronic equipment is not fail-safe. The machine manufacturer is responsible for ensuring that the con-
nected motors and the machine are brought into a safe state in the event of a fault in the drive system.
NOTE
Caution – electrostatic charging may lead to destruction of the Safety Card!
The Safety Card is an ESD-sensitive component. Follow the usual ESD safety procedures when handling
the card (anti-static wrist straps, earthing of the relevant components etc.).
6.2 Description of product and function
6.2.1 Intended use
WARNING
Caution - Risk of injury!
TwinSAFE terminals may only be used for the purposes described below!
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 switch-
ing 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
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