Description
Siemens IOR810K02A – Compact Auxiliary I/O Relay Module for Panel and DCS/PLC Interfacing
The Siemens IOR810K02A is commonly used as a compact auxiliary I/O relay block—ideal when you need a clean, hardwired bridge between field signals and a higher-level system such as a DCS, PLC, or protection relay. From my experience, it suits upgrades where space is tight and you want straightforward wiring without changing the main controller. You might notice that projects lean on modules like this to add extra contacts for alarms, interlocks, and permissives with minimal re-engineering.
Company’s Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery: 1 week for in-stock items; no more than one month at the latest
- Payment: 50% advance payment; full payment before delivery
- Express: FedEx, UPS, DHL
Key Features
- 8 digital inputs / 10 relay outputs (typical for this series): Suits alarm collection and permissive logic without overloading the PLC rack.
- Hardwired terminal I/O: No protocol dependency—easy to drop into brownfield panels where dry contacts are preferred.
- 24 VDC control power (typical): Matches standard industrial control power, simplifying cabinet integration.
- DIN-rail/panel mounting: Quick to mount in compact cabinets; wiring stays tidy and serviceable.
- Fail-safe wiring practices supported: Relay outputs typically allow interlock, trip, or annunciation circuits with clear separation.
- Maintenance-friendly layout: You can label terminals clearly; troubleshooting usually takes minutes, not hours.
Technical Specifications
| Brand / Model | Siemens IOR810K02A |
| HS Code | 8537.10 (Boards/panels for electric control or distribution) |
| Power Requirements | 24 VDC nominal (typically 18–30 VDC range) |
| Signal Input / Output | Approx. 8x digital inputs (24 VDC), 10x relay outputs (SPST/SPDT variant depending on K02A build; commonly up to 2 A at 30 VDC) |
| Communication Interfaces | Hardwired terminals; typically no fieldbus required |
| Installation Method | DIN-rail (EN 60715) or panel mounting |
| Operating Temperature | Typically 0 to +55 °C (industrial control cabinet conditions) |
| Dimensions & Weight | Compact DIN-rail form factor; commonly around 120 × 100 × 45 mm, ~0.25 kg |
Values marked as “typical” reflect common Siemens auxiliary I/O module builds and field usage; exact limits may vary by sub-variant K02A and production revision.
Where it’s used (real scenarios)
- Adding interlock contacts to a burner management system without touching the safety PLC code.
- Bridging pump start/stop signals and status lamps during a water plant migration to a new SCADA.
- Expanding alarm outputs for a motor control center (MCC) where spare PLC slots aren’t available.
A maintenance lead from a beverage plant told us the relay outputs “saved the weekend”—they dropped one module into a crowded cabinet to pull out discrete alarms for the old annunciator while the new PLC was still in commissioning. That kind of flexible wiring is, in many cases, the difference between stopping and staying online.
Related or Supporting Products
- SIMATIC ET 200SP DI 8x24VDC HF (6ES7131-6BF00-0BA0): If you prefer direct PLC I/O on PROFINET, this 8-channel DI module is a neat alternative within ET 200SP.
- SIMATIC ET 200SP DO 8x24VDC HF (6ES7132-6BF00-0BA0): 8-channel digital output when relay isolation isn’t needed and you’re on a Siemens PLC rack.
- Siemens SITOP PSU100C 24 VDC power supply: Stable 24 VDC feed for auxiliary I/O modules; typically used for clean control power.
- SIRIUS 3RT contactors / 3RB overloads: For switching higher loads from the module’s relay contacts when you need extra current capacity.
Installation & Maintenance
- Cabinet standards: Mount in a clean, dry enclosure; follow EN 60204-1 practices and maintain ingress protection suitable for the environment.
- Ventilation & spacing: Provide airflow and at least a few centimeters clearance around the module; avoid mounting next to heat sources.
- Wiring: Use ferrules and segregate power vs. signal; keep relay load wiring away from low-level I/O to reduce noise.
- Protection: Add appropriate fusing on the 24 VDC feed; consider snubbers or RC networks on inductive loads to prolong relay life.
- Commissioning: Verify each input transitions cleanly at 24 VDC and confirm relay contact states under load before handover.
- Routine maintenance: Quarterly terminal torque check, visual inspection for heat discoloration, and contact wear review; replace relays if contact resistance rises.
Quality & Certifications
- CE compliant; RoHS conform
- UL/cUL certifications typically apply for Siemens control components
- Manufactured under ISO 9001 quality systems
- Warranty: 365 days
If you’re matching a specific sub-variant of IOR810K02A (contact form or coil spec), share your panel drawing or load list—this helps us confirm contact ratings, I/O count, and mounting kit before we ship.
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