Relay Output Solution — SIEMENS 6ES7222-1HF22-0XA0 | S7-200 Series
The SIEMENS 6ES7222-1HF22-0XA0 is an 8-point relay digital output expansion module designed for the SIMATIC S7-200 Micro PLC family. It bridges the gap between low-voltage PLC logic and real-world AC/DC loads, delivering robust, isolated switching performance in demanding industrial environments. Engineers worldwide specify this module for its proven reliability, broad load compatibility, and seamless integration with the S7-200 ecosystem.
Where This Product Is Used
This relay output module is deployed across a wide range of industrial and commercial automation applications:
- Motor Starter Control — Switching contactors and motor starters in conveyor lines, pumping stations, and compressor systems
- HVAC & Building Automation — Controlling fans, dampers, chillers, and zone valves in commercial HVAC systems
- Packaging Machinery — Actuating solenoid valves, pneumatic cylinders, and reject gates on packaging lines
- Water & Wastewater Treatment — Driving pump contactors, level control valves, and alarm annunciators
- Food & Beverage Processing — Controlling conveyor drives, filling stations, and CIP (Clean-In-Place) valve banks
- Textile & Printing Equipment — Sequencing tension rollers, drying units, and web-guide actuators
- OEM Machine Building — General-purpose relay output expansion wherever S7-200 CPUs are the platform of choice
Technical Specifications
- Part Number: 6ES7222-1HF22-0XA0
- Series: SIMATIC S7-200
- Module Type: Digital Output Expansion Module
- Output Type: Relay (dry contact)
- Number of Outputs: 8 points
- Output Voltage Range: 24 V DC / 24–250 V AC
- Max Switching Current: 2 A per point (resistive load)
- Max Switching Frequency: 1 Hz (relay mechanical)
- Isolation: Galvanic isolation between PLC logic and field side
- Supply Voltage: 24 V DC (from CPU or external)
- Power Consumption: Approx. 2 W
- Operating Temperature: 0 °C to +55 °C
- Storage Temperature: −40 °C to +70 °C
- Degree of Protection: IP20
- Dimensions (W × H × D): 71.2 × 80 × 62 mm
- Weight: Approx. 100 g
- Mounting: DIN rail (35 mm)
- Connection: Removable screw terminals
Why Engineers Specify This Model
- Voltage-Agnostic Outputs — Relay contacts switch both AC and DC loads without additional interface relays, simplifying panel design
- Galvanic Isolation — Hard contact isolation protects the PLC backplane from field-side voltage transients and ground loops
- Plug-and-Play Expansion — Connects directly to any S7-200 CPU via the expansion bus; no additional configuration hardware required
- Compact DIN-Rail Form Factor — Fits standard 35 mm DIN rail in space-constrained control panels
- Removable Terminal Blocks — Enables fast field wiring replacement without disturbing adjacent modules
- Proven MTBF — Siemens-rated mechanical relay life supports high-cycle industrial duty cycles
- Wide Operating Temperature — Qualified for 0–55 °C ambient, covering most indoor industrial environments without forced cooling
Complete System Bill of Materials
For a fully operational S7-200 control system using this output module, engineers typically specify:
- CPU Module — e.g., 6ES7214-1BD23-0XB0 (CPU 224) or 6ES7212-1AB23-0XB0 (CPU 221)
- Digital Input Module — e.g., 6ES7221-1BF22-0XA0 (8 × 24 V DC inputs)
- Power Supply — 24 V DC regulated PSU, min. 3 A for CPU + expansion
- Programming Cable — 6ES7901-3CB30-0XA0 (PC/PPI USB adapter)
- STEP 7-Micro/WIN Software — For ladder logic, FBD, or STL programming
- DIN Rail & End Brackets — TS 35 rail with appropriate end stops
- Surge Protection — 24 V DC SPD on field supply lines (recommended for outdoor or long cable runs)
- Contactors / SSRs — Downstream switching devices rated for motor or load current
Compliance & Industry Standards
- CE Marking — Compliant with EU Low Voltage Directive and EMC Directive
- UL Listed — UL 508 (Industrial Control Equipment)
- cULus — Canadian market approval
- IEC 61131-2 — Programmable controllers — Equipment requirements and tests
- RoHS Compliant — Restriction of Hazardous Substances Directive 2011/65/EU
- ATEX / IECEx — Not rated for hazardous area use; install in suitable enclosure if required
Quality Assurance & Sourcing
At Konmask.com, every unit of the 6ES7222-1HF22-0XA0 is subject to our multi-point sourcing and inspection protocol:
- Sourced exclusively from authorized Siemens distributors and verified secondary-market channels
- Each module inspected for authentic Siemens holographic labeling, date codes, and firmware revision markings
- Functional power-on verification performed prior to dispatch
- Anti-static packaging with humidity indicator cards for safe international transit
- Full traceability documentation available on request (batch records, COC)
How to Source This Part
- Add to Cart — Click the purchase button above to place your order directly on Konmask.com
- Request a Quote — For quantities ≥ 5 units or project BOM pricing, email support@konmask.com with your project details
- Lead Time — In-stock units ship within 1–3 business days; ex-stock orders confirmed at checkout
- Shipping — DHL Express, FedEx International Priority, and sea freight options available worldwide
- Payment — T/T bank transfer, PayPal, and major credit cards accepted
- After-Sales — 12-month warranty; DOA replacement within 7 days of receipt
Application-Specific FAQ
Q: Can the 6ES7222-1HF22-0XA0 switch 220 V AC motor contactors directly?
A: Yes. The relay contacts are rated for up to 250 V AC at 2 A resistive. For inductive loads (contactors, solenoids), derate to ~1.5 A and add a snubber or varistor across the coil to suppress back-EMF.
Q: How many expansion modules can I connect to one S7-200 CPU?
A: The S7-200 CPU 224 supports up to 7 expansion modules. The total I/O expansion bus current must not exceed the CPU’s rated expansion bus supply (typically 660 mA at 5 V DC).
Q: Is this module compatible with the S7-200 SMART series?
A: No. The 6ES7222-1HF22-0XA0 is designed for the classic S7-200 platform. The S7-200 SMART uses a different expansion bus and requires SMART-series expansion modules (e.g., EM QR08).
Q: What is the expected relay mechanical life?
A: Siemens specifies ≥ 10 million mechanical operations under no-load conditions. Under rated resistive load, electrical life is typically ≥ 100,000 operations.
Q: Can I mix relay and transistor output modules on the same CPU?
A: Yes. S7-200 expansion modules of different output types can coexist on the same CPU expansion bus, provided total bus current limits are respected.
Q: Do you provide STEP 7-Micro/WIN configuration files or sample programs?
A: Yes — contact support@konmask.com and our technical team will share relevant sample ladder logic for common relay output applications.
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