BECKHOFF KL1904 - Manual (Page 15)

Product description
KL1904 13
3.2 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 (KL1904) 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 (KL2904, KL6904) such as
contactors, protection door switches with tumbler, signal lamps, servo drives, etc.
The following modules were developed for these tasks:
 The KL1904 terminal is an input module with digital inputs.
 The KL2904 terminal is an output module with digital outputs.
 The KL6904 terminal is a logic module with digital outputs.
These modules are suitable for operation with
 Beckhoff BKxxxx series Bus Couplers
 Beckhoff BXxxxx series Bus Terminal Controllers (with firmware version ≥ 1.20)
(Beckhoff BCxxxx series Bus Terminal Controllers are not supported!)
 Beckhoff CXxxxx series Embedded PCs with K-Bus connection
CAUTION
Follow the machinery directive
The TwinSAFE terminals may only be used in machines according to the Machinery
Directive.
CAUTION
Ensure traceability
The buyer has to ensure the traceability of the device via the serial number.