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Description
Application Scenarios
In a municipal water treatment plant’s aging control system, the operator faced a recurring issue: transistor-based output modules were failing due to the inductive kickback generated by the frequent switching of large motorized valve actuators. Each failure forced a manual bypass and costly unscheduled maintenance. By retrofitting the Schiele 2.423.451.00 relay output module, the plant engineer eliminated these failures entirely. The electromechanical relays provided robust isolation and easily handled the inductive loads with their 2A contact rating. The plant’s maintenance supervisor noted that with the Schiele 2.423.451.00, they could confidently switch both the 220VAC pump contactors and the 24VDC solenoid pilot valves from a single card, simplifying their spare parts inventory and restoring plant reliability. The card’s pluggable terminal blocks allowed for a quick swap with zero re-wiring, getting the system back online within minutes.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | Schiele 2.423.451.00 (2_423_451_00) |
| Manufacturer | Schiele GmbH (German Engineering) |
| Product Category | Digital Output Module (Relay Output) |
| Number of Channels | 16 channels with independent SPDT (NO + NC) contacts |
| Output Type | Electromechanical Relay (Dry Contact) |
| Contact Rating | 250 VAC / 2 A or 30 VDC / 2 A |
| Electrical Isolation | 1500 Vrms (between channels and backplane) |
| Response Time | < 10 ms (pick-up), < 5 ms (release) |
| System Compatibility | SCHIELE S700 / S800 Control Systems |
| Power Supply | 5 VDC / 24 VDC via system backplane |
| Power Consumption | 3.5 W typical |
| Operating Temperature | 0°C to +60°C |
| Mounting Type | DIN-rail or proprietary SCHIELE backplane |
| Diagnostic Indicators | 16 individual LED status lights + power LED |
Technical Principles and Innovative Values
- Innovation Point 1: Universal AC/DC Load Handling via Relays
The Schiele 2.423.451.00 differentiates itself from common transistor output modules by using relay-based output stages. This design offers complete electrical isolation between the control logic and the field wiring, eliminating the risk of backplane damage from field wiring faults. It provides the unique advantage of “universal” load handling—each of its 16 channels can switch 250VAC motor starters or 30VDC indicator lamps without requiring voltage-specific cards. This flexibility is particularly valuable in retrofit projects where load voltages vary widely. - Innovation Point 2: Fail-Safe SPDT Contacts for Enhanced Control
The inclusion of both Normally Open (NO) and Normally Closed (NC) contacts on each channel provides the Schiele 2.423.451.00 with inherent fail-safe capability. This allows the design of circuits that default to a safe state (e.g., a valve remaining open or closed) even if the module loses power or communication. In applications like burner management or emergency shutdown circuits, this feature allows the Schiele 2.423.451.00 to contribute to functional safety concepts where a de-energized output must be a known and safe condition. - Innovation Point 3: Pluggable Terminals for Zero-Downtime Maintenance
The Schiele 2.423.451.00 features pluggable terminal blocks (Pluggable Terminal Block). Unlike fixed-wire modules, this allows maintenance personnel to disconnect all field wiring from the faulty unit and reattach it to a replacement module without re-stripping or re-terminating any wires. This design reduces Mean Time to Repair (MTTR) for this critical I/O component from potentially over an hour to under five minutes, saving valuable production time. - Innovation Point 4: Comprehensive LED Diagnostics for Rapid Troubleshooting
With 16 individual channel-status LEDs and a power indicator on the front panel, the Schiele 2.423.451.00 provides immediate visual feedback on system health and output activation. This real-time diagnostic capability empowers technicians on the factory floor to identify a failed output, or simply confirm that the PLC program is sending the correct command, without needing to use a multimeter or connect to the software.
Application Cases and Industry Value
Case 1: Boiler Control System Reliability Upgrade
A district heating facility relied on SCHIELE S700 controllers for their gas-fired boiler management. The facility experienced intermittent faults with a competitor’s solid-state output modules due to the high inrush current of motorized damper actuators. After replacing the module with the Schiele 2.423.451.00, the failures ceased. The relays effectively absorbed the switching surges, eliminating the nuisance trips that had caused unplanned heat outages. The facility manager reported that the module’s performance restored their confidence in the heating system’s reliability and allowed them to postpone a planned $50,000 control system upgrade.
Case 2: Material Handling Conveyor System Retrofit
An automotive parts manufacturer used SCHIELE S800 systems to control a network of conveyors. When a digital output module failed, they had to replace it with a new one. However, the wiring documentation was outdated, leading to hours of troubleshooting. By deploying the Schiele 2.423.451.00 with pluggable terminals, the maintenance team was able to complete the replacement in 10 minutes without a wiring diagram. This application demonstrates the module’s value in reducing downtime and simplifying maintenance in complex, aging systems.
