1. Functional Overview

The module provides 24 VDC supply distribution and line protection for I/O modules and connected sensor circuits.

It integrates four miniature fuses, each individually monitored and indicated via dedicated LEDs. An internal evaluation logic supervises fuse status and controls a collective fault relay output.

2. Fuse Monitoring & Indication

Number of fuses: 4

Fuse type: Max. 4 A, slow-blow

Each fuse is:

Monitored by internal evaluation logic

Associated with a dedicated LED

LED Indication Logic

Fuse OK: Corresponding LED ON

Fuse faulty or missing: LED OFF, fault detected

Module not wired: All LEDs OFF

Commoned current paths without input voltage: Individual fuse state cannot be reliably determined

3. Supply & Connection Interfaces
Front-side Terminals

Pins 1, 2, 3, 4, and L-

Used to connect L+ / EL+ and L-

Provide 24 V supply to I/O modules and sensor contacts

Rear-side Terminals

d6, d10, d14, d18

24 V supply output for one I/O slot each

d22 / z24

Collective fault relay contact

4. Relay Monitoring Function

If all fuses are OK → Relay contact d22/z24 closed

If any fuse is missing or faulty → Relay de-energized (open)

Switching time: Approx. 100 ms

Relay Contact Rating

30 V / 4 A (continuous load)

5. Electrical Characteristics
Parameter Value
Operating Voltage 24 VDC
Operating Current 60 mA
Fuse Rating Max. 4 A (slow-blow)
Switching Time (Relay) ~100 ms
Relay Load Capacity 30 V / 4 A
Space Requirement 4 TE
6. Output Behavior in Fault Conditions
Case: Fuse Tripped

Residual voltage: 0 V

Residual current: 0 mA

Case: Missing Supply

Residual voltage: Max. 3 V

Residual current: < 1 mA

7. Application Context

This module is typically used in:

HIQuad / HIMax safety systems

24 VDC distribution to I/O racks

Field sensor power protection

Safety-related systems requiring monitored supply circuits