SIEMENS 6ES7222-1HF22-0XA8 – SM 1222 16-Point Relay Digital Output Module | SIMATIC S7-1200 Series
Engineering Background
The SIMATIC S7-1200 series represents Siemens’ flagship compact PLC platform for discrete and process automation. The SM 1222 signal module family extends the S7-1200 CPU’s I/O capacity without requiring additional communication infrastructure, making it the preferred expansion choice for machine builders and system integrators operating in space-constrained control cabinets.
Product Positioning
The 6ES7222-1HF22-0XA8 is a 16-point relay digital output signal module designed for direct load switching of AC/DC actuators, solenoids, contactors, and indicator lamps. Its relay output architecture provides galvanic isolation between the PLC logic and field devices, making it the correct selection for mixed-voltage field environments and applications requiring robust electrical isolation.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6ES7222-1HF22-0XA8 |
| Module Type | SM 1222 Digital Output Module |
| Platform | SIMATIC S7-1200 |
| Number of Outputs | 16 DO (Digital Outputs) |
| Output Type | Relay (Form A, NO contact) |
| Rated Load Voltage | 5 VDC to 250 VAC / 30 VDC |
| Max Switching Current (Resistive) | 2 A per output |
| Max Switching Current (Inductive) | 0.5 A per output (AC); 1 A per output (DC) |
| Relay Mechanical Life | 10,000,000 operations |
| Relay Electrical Life | 100,000 operations at rated load |
| Output Groups | 2 groups × 8 outputs (common per group) |
| Isolation (Field to Logic) | Galvanic (relay contact) |
| Supply Voltage (Logic) | 24 VDC (from CPU backplane bus) |
| Power Consumption (Logic) | ≤ 4 W |
| Dimensions (W × H × D) | 45 mm × 100 mm × 75 mm |
| Weight | Approx. 200 g |
| Operating Temperature | 0 °C to +55 °C (horizontal); 0 °C to +45 °C (vertical) |
| Storage Temperature | −40 °C to +70 °C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Protection Class | IP20 |
| Certifications | CE, UL, cUL, FM, ATEX Zone 2 |
| Compatible CPUs | CPU 1211C, 1212C, 1214C, 1215C, 1217C |
| Max Modules per CPU | 8 signal modules (right-side expansion) |
| STEP 7 TIA Portal Version | V13 SP1 and above |
Proven Application Environments
- Motor Starter Control: Direct switching of contactor coils (AC 230 V) in pump and fan motor circuits
- Solenoid Valve Actuation: Pneumatic and hydraulic valve control in packaging and filling lines
- Indicator & Alarm Panels: Pilot lamp and audible alarm switching in operator interface panels
- Conveyor & Material Handling: Zone control and diverter gate actuation in logistics automation
- HVAC Systems: Damper actuator and fan relay control in building automation
- Mixed-Voltage Installations: Simultaneous control of 24 VDC and 230 VAC loads from a single module
- Safety-Adjacent Applications: Non-safety-rated output switching where relay isolation is required by design
Engineering Advantages
- Galvanic Isolation: Relay contacts provide complete electrical separation between PLC logic and field wiring, eliminating ground loop interference and protecting CPU backplane from field transients
- Universal Voltage Compatibility: Single module handles 5–250 VAC and 5–30 VDC loads, reducing BOM complexity in mixed-voltage panels
- Tool-Free Installation: Snap-on DIN rail mounting with integrated backplane connector; no inter-module wiring required
- TIA Portal Integration: Full hardware configuration, diagnostics, and firmware update support within STEP 7 TIA Portal V13+
- Compact Form Factor: 45 mm width enables high-density I/O expansion within standard 300 mm cabinet sections
- Diagnostic Capability: Module-level fault detection reported to CPU via backplane bus; accessible via TIA Portal online diagnostics
System Architecture & Signal Flow
The 6ES7222-1HF22-0XA8 connects directly to the right side of any S7-1200 CPU via the integrated backplane bus connector. The CPU allocates output process image addresses automatically upon hardware configuration in TIA Portal. Each output group shares a common terminal, allowing independent voltage sources per group. The relay coil is driven by the CPU’s 24 VDC logic supply via the backplane bus; no separate module power supply is required for logic operation. Field wiring connects to the removable screw-terminal connector block, enabling module replacement without rewiring.
Signal Flow: TIA Portal PLC Program → CPU Output Process Image → Backplane Bus → SM 1222 Relay Driver → Relay Coil → Relay Contact → Field Load
Sourcing & Quality Verification
- Origin: Genuine Siemens-manufactured product; sourced through authorized industrial distribution channels
- Authenticity Verification: Each unit carries Siemens holographic authenticity label and traceable batch code
- Condition: New-in-box (NIB) with original Siemens packaging and documentation unless otherwise stated
- Inspection: Pre-shipment functional check and visual inspection performed by Konmask technical team
- Warranty: 12-month Konmask supply warranty covering manufacturing defects; Siemens OEM warranty terms apply
- Counterfeit Risk Mitigation: All units verified against Siemens Product Authenticity Check (PAC) system prior to dispatch
Procurement Process
- Confirm Part Number: Verify 6ES7222-1HF22-0XA8 against your BOM or TIA Portal hardware catalog entry
- Check Compatibility: Confirm target CPU firmware version supports SM 1222 (TIA Portal V13 SP1 minimum)
- Request Quote: Contact support@konmask.com with quantity, required delivery date, and destination port
- Order Confirmation: Receive proforma invoice with lead time, shipping method, and payment terms
- Shipment & Tracking: DHL / FedEx / SF Express with full tracking; export documentation (CO, packing list, commercial invoice) included
- Incoming Inspection: Recommended: verify Siemens PAC label and test module in TIA Portal hardware detection before installation
Technical FAQ
Q: Can this module switch 230 VAC loads directly?
A: Yes. The relay contacts are rated for up to 250 VAC at 2 A resistive. Ensure field wiring and terminal block ratings comply with local electrical codes.
Q: How many SM 1222 modules can be connected to one S7-1200 CPU?
A: Up to 8 signal modules can be connected to the right side of any S7-1200 CPU (CPU 1211C supports fewer; consult the S7-1200 System Manual for per-CPU limits).
Q: Is a separate 24 VDC supply required for the module?
A: No. Logic power is supplied via the CPU backplane bus. Only the field load circuit requires an external power source.
Q: What is the minimum TIA Portal version required?
A: TIA Portal STEP 7 V13 SP1 or higher. Siemens recommends V16 or V17 for full diagnostic and firmware update support.
Q: Is this module suitable for SIL-rated safety applications?
A: No. The SM 1222 is a standard (non-safety) signal module. For SIL 2/3 applications, use the SIMATIC S7-1200F CPU with F-SM safety modules.
Q: Can Konmask provide a Certificate of Conformity or test report?
A: Yes. CoC, Siemens PAC verification record, and inspection report are available upon request for each shipment.
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