System description
EL6900
13
Version: 2.2.0
• Operation with a TwinSAFE logic terminal
• EL1904 with 4 fail-safe inputs for sensors (24 VDC) with floating contacts
• EL2904 with four safe channels for actuators (24 VDC, 0.5 A per channel)
• Conforming to IEC 61508:2010 SIL 3 and DIN EN ISO 13849-1:2006 (Cat 4, PL e) requirements.
2.2.3
EL1904, EL2904 - Bus Terminals with 4 fail-safe inputs or
outputs
The EL1904 and EL2904 Bus Terminals enable connection of common safety sensors and actuators. They
are operated with the EL6900 TwinSAFE logic terminal. The TwinSAFE logic terminal is the link unit between
the TwinSAFE input and output terminals. It enables the configuration of a simple, flexible and cost-effective
decentralized safety control system.
Therefore, there are no safety requirements for the higher-level controller! The typical safety functions
required for the automation of machines, such as emergency stop, protective door, two-hand etc., are
already permanently programmed in the EL6900. The user configures the EL6900 terminal according to the
safety requirements of his application.
2.2.4
EL6900 - TwinSAFE logic terminal
The TwinSAFE logic terminal is the link unit between the TwinSAFE input and output terminals. The EL6900
meets the requirements of IEC 61508:2010 SIL 3, EN 954 Cat. 4 and DIN EN ISO 13849-1:2006 (Cat 4, PL
e).
2.2.5
The fail-safe principle (Fail Stop)
The basic rule for a safety system such as TwinSAFE is that failure of a part, a system component or the
overall system must never lead to a dangerous condition. The safe state is always the switched off and
wattless state.
Summary of Contents for EL6900
Page 1: ...Operating Instructions for EL6900 TwinSAFE Logic Terminal 2 2 0 2017 05 10 Version Date...
Page 2: ......
Page 34: ...Operation EL6900 34 Version 2 2 0 Fig 18 Creating a TwinSAFE group...
Page 37: ...Operation EL6900 37 Version 2 2 0 Fig 22 Appended Emergency Stop block...
Page 59: ...Appendix EL6900 59 Version 2 2 0 5 2 Certificates...
