LACROIX Sofrel S4W - S4 W Digital Output (DO) Configuration; Digital Output Connection; Digital Output Technical Specs

Case - Inputs/Outputs
Connection of DOs
DOs are 12 V / 24 V AC/DC ’very low voltage’ voltage-relay type digital outputs: they are compatible with 24 V relays and control panel
indicator lights.
By default, and following a total power cut (24V and Battery), DOs are in their 'open' state (idle state = 0).
In case of product reinitialisation, the state of each DO is retained (no forced return to the idle state).
The user defines the ‘bistable’ or ‘impulse’ control type when configuring each DO data point.
When a DO is configured to control the ‘Watchdog safety’ feature; this output is reinitialised according to inverse logic (the output is
in the closed state if no default; it switches to the open state if a default is present). This 'Watchdog' output is very useful for controlling
power supply and for the proper functioning of the RTU (see § ‘Data processing – Operational safety’).
The DO do not allow direct control of power units.
Example of control of 2 DC relays by 2 DO:
Technical specifications
- Number of DO: - 4 in alternating current (AC) and/or direct current (DC)
- Output type:
- free from all potential
- Maximum switching voltage:
- 24 V AC/DC +20% (40 V peak)
- Continuous current:
- 150 mA
- Isolation:
- 1500 V
RMS
between the DO and the control case
1 pair for the DO no.1
1 pair for the DO no.2
DC relay
DC relay
DO terminal strip: