The EL1904 TwinSAFE component is a digital input terminal for sensors

with potential-free contacts for 24 V DC. It has four fail-safe inputs.

The signals are transmitted via FSoE to a TwinSAFE Logic-capable

component and can be used there to evaluate them in terms of safety.

The EL1904 has safety parameters to adapt the functionality specifically

to the respective safety-oriented requirements (e.g., 1 channel evaluation

vs. 2-channel evaluation, testing of the individual channels).

The safety parameters are not stored directly on the component, but are

transmitted to the input terminal via a TwinSAFE Logic capable component

when the safety application is started. This simplifies service procedures,

because the component can simply be replaced. The safety-relevant

parameters are transferred to the new component when the safety

application is restarted.

Special features:

• 4 safe inputs

• cross-circuit detection

• 1-channel vs. 2-channel evaluation directly on the component

• testing of the channels can be activated individually