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Article No. KL6904

KL6904 | Bus Terminal, communication interface + 4-port digital output, 24 V DC, 0.5 A, TwinSAFE Logic

TwinSAFE enables networks with up to 1,024 TwinSAFE devices. The KL6904 TwinSAFE logic Bus Terminal can establish 15 connections (TwinSAFE connection). Multiple logic terminals are cascadable within a network. The Bus Terminal features certified safety function blocks, which are configured according to the application to be realized. Functions such as emergency stop, safety door monitoring etc. can thus easily be selected and linked. All function blocks can be freely connected among each other and are complemented by operators such as AND, OR, etc. The required functions are configured via the TwinCAT System Manager and loaded into the KL6904 logic terminal via the fieldbus. The TwinSAFE logic terminal has four safe, local outputs, so that safety applications can be realized with only two components (KL1904 and KL6904).

Special features:

  • safety applications on the basis of Boolean values
  • 4 safe outputs
  • up to 15 safe connections
  • up to 48 function blocks
  • up to 8 TwinSAFE groups
Technical dataKL6904
Connection technology2-wire
Specificationlink unit between safe input and output signals
Number of outputs4
Max. output current0.5 A/20 mA min. (per channel)
ProtocolTwinSAFE/Safety over EtherCAT
Cycle time4…100 ms
Fault response time≤ watchdog time (parameterizable)
Current consumption power contactsload-dependent
Current consumption K-busmax. 250 mA
Installation positionhorizontal
Safety standardDIN EN ISO 13849-1:2008 (Cat. 4, PL e) and EN 61508:2010 (SIL 3)
Weightapprox. 100 g
Protection classIP 20
Ex markingII 3 G Ex nA IIC T4 Gc

Housing dataKL-24-2x8pin
Design formcompact terminal housing with signal LEDs
Dimensions (W x H x D)24 mm x 100 mm x 68 mm
Installationon 35 mm DIN rail, conforming to EN 60715 with lock
Side by side mounting by means ofdouble slot and key connection
Markinglabeling of the BZxxx series
Wiringsolid conductor (e), flexible conductor (f) and ferrule (a): spring actuation by screwdriver
Connection cross-sections*: 0.08…2.5 mm²,
st*: 0.08…2.5 mm²,
f*: 0.14…1.5 mm²
Connection cross-section AWGs*: AWG 28…14,
st*: AWG 28…14,
f*: AWG 26…16
Stripping length8…9 mm
Current load power contactsImax: 10 A
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