SIEMENS 6ES7223-1PH22-0XA8 – 8-Point Digital Input / 8-Point Relay Output Expansion Module | SIMATIC S7-200 SMART
Engineering Background
The SIMATIC S7-200 SMART series represents Siemens’ purpose-built compact PLC platform for cost-sensitive discrete automation in Asia-Pacific markets. Launched as the successor to the S7-200 Classic, the S7-200 SMART retains the proven ladder/FBD/STL programming model while adding Ethernet-native communications, high-speed I/O, and a modular expansion architecture. The 6ES7223-1PH22-0XA8 is a mixed digital expansion module that adds 8 discrete inputs and 8 relay outputs to any S7-200 SMART CPU, extending machine I/O capacity without requiring a larger CPU footprint.
Product Positioning
Designed for OEM machine builders, panel integrators, and process automation engineers who need reliable, cost-effective I/O expansion on the S7-200 SMART platform. The relay output stage provides galvanic isolation and broad load compatibility — from 24 VDC solenoids to 230 VAC contactors — making this module the preferred choice for mixed-voltage machine panels across packaging, material handling, HVAC, and light manufacturing applications.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6ES7223-1PH22-0XA8 |
| Product Family | SIMATIC S7-200 SMART Expansion Module |
| Module Type | Digital Combination: 8 DI + 8 DO (Relay) |
| Digital Inputs | 8 × 24 VDC, sink/source (IEC Type 1) |
| Input Voltage Range | 20.4 – 28.8 VDC |
| Input Current (nominal) | 4 mA @ 24 VDC |
| Input Impedance | 4 kΩ |
| Signal ON Threshold | ≥ 15 VDC |
| Signal OFF Threshold | ≤ 5 VDC |
| Digital Outputs | 8 × Relay (Form A, SPST-NO) |
| Output Voltage Range | 5 – 30 VDC / 5 – 250 VAC |
| Max Resistive Load | 2 A per point |
| Max Inductive Load | 2 A per point (with external suppression) |
| Relay Mechanical Life | 10,000,000 operations |
| Relay Electrical Life | 100,000 operations @ rated load |
| Isolation (I/O to Logic) | 1500 VAC, 1 min |
| Supply Voltage | 24 VDC (from CPU expansion bus) |
| Current Consumption (5 VDC bus) | 110 mA |
| Current Consumption (24 VDC) | 45 mA (no load) |
| Power Dissipation | 2 W (typical) |
| Dimensions (W × H × D) | 71.2 × 100 × 62 mm |
| Weight | Approx. 180 g |
| Protection Rating | IP20 |
| Operating Temperature | 0 – 55 °C (horizontal), 0 – 45 °C (vertical) |
| Storage Temperature | –40 – +70 °C |
| Relative Humidity | 5 – 95% RH (non-condensing) |
| Vibration Resistance | IEC 60068-2-6: 5 – 150 Hz, 1 g |
| Shock Resistance | IEC 60068-2-27: 15 g, 11 ms |
| EMC Compliance | CE, cULus, FM |
| Mounting | DIN rail (35 mm) or panel mount |
| Connector Type | Removable screw terminal, 2.5 mm² |
| Compatible CPUs | S7-200 SMART CPU SR20 / SR30 / SR40 / SR60 / ST20 / ST30 / ST40 / ST60 |
| Max Expansion Modules per CPU | 6 |
| STEP 7-Micro/WIN SMART Version | V2.3 or later |
Proven Application Environments
- Packaging Machinery: Conveyor start/stop, reject gate control, sensor feedback integration on S7-200 SMART-based lines.
- HVAC & Building Automation: Fan/pump relay switching, damper actuator control, mixed 24 VDC / 230 VAC panel architectures.
- Material Handling: Solenoid valve banks, limit switch arrays, indicator lamp control in warehouse automation cells.
- Light Manufacturing: Fixture clamping, part-present detection, alarm annunciator panels.
- Water Treatment: Pump sequencing, level switch monitoring, valve actuation in small-scale process skids.
- OEM Machine Retrofit: Drop-in I/O expansion for legacy S7-200 SMART panels requiring additional field points without CPU replacement.
Engineering Advantages
- Mixed Voltage Relay Outputs: Single module handles both 24 VDC and 230 VAC loads — eliminates the need for separate relay interface modules in mixed-voltage panels.
- Galvanic Isolation: 1500 VAC relay isolation protects CPU logic from field-side transients and ground loops.
- Compact Form Factor: 71.2 mm wide — fits 6 expansion modules within a standard 600 mm DIN rail section alongside the CPU.
- Plug-in Screw Terminals: Removable terminal blocks allow module swap without rewiring — critical for minimizing machine downtime during maintenance.
- Direct Bus Power: Powered entirely from the CPU expansion bus; no separate 24 VDC supply wiring required for module logic.
- Wide Temperature Range: 0–55 °C horizontal operation covers the majority of industrial panel environments without forced cooling.
System Architecture & Signal Flow
The 6ES7223-1PH22-0XA8 connects to the S7-200 SMART CPU via the proprietary side-bus expansion connector. The CPU automatically detects and addresses the module during power-up; no manual address configuration is required. In STEP 7-Micro/WIN SMART, the module appears in the System Block under the Expansion Modules tab, where I/O addresses are assigned sequentially based on slot position.
Signal flow — Digital Inputs: Field sensor → screw terminal → optical isolator → input image register → CPU scan cycle → user program.
Signal flow — Relay Outputs: CPU output image register → relay coil driver → relay contact → screw terminal → field actuator. Each relay output is individually fused at the field wiring level (external fuse recommended: 2 A fast-blow per point).
Up to 6 expansion modules can be chained to a single CPU, providing a maximum of 48 additional DI and 48 additional DO (relay) points using this module type exclusively.
Sourcing & Quality Verification
- Origin: Genuine Siemens product, manufactured under ISO 9001-certified processes.
- Traceability: Each unit carries a Siemens factory serial number and date code on the housing label — verifiable via Siemens Industry Online Support (SIOS).
- Inspection: All units at Konmask.com are inspected for intact housing, legible labeling, undamaged expansion connector, and intact terminal blocks prior to dispatch.
- Packaging: Ships in original Siemens ESD-protective packaging with foam insert. Outer carton includes packing slip with part number, serial number, and quantity.
- Counterfeit Risk Mitigation: Konmask.com sources exclusively from authorized distributors and verified surplus channels. Customers are encouraged to cross-check serial numbers via SIOS at support.industry.siemens.com.
Procurement Process
- Add to Cart — Select quantity and click “Add to Cart”. Bulk pricing available for orders ≥ 5 units; contact us for a formal quotation.
- Checkout — Secure checkout via credit card, T/T bank transfer, or PayPal. Pro-forma invoice available on request.
- Order Confirmation — Order acknowledgment with estimated ship date sent within 1 business day.
- Dispatch — Ships from Xiamen, China via DHL Express, FedEx International, or EMS. Typical transit: 3–7 business days to most destinations.
- Documentation — Commercial invoice, packing list, and certificate of origin provided with every shipment. FORM E (ASEAN-China FTA) available on request.
- After-Sales — 12-month warranty against manufacturing defects. Technical support via email at support@konmask.com.
Technical FAQ
Q: Is the 6ES7223-1PH22-0XA8 compatible with the original S7-200 (Classic) CPU?
A: No. This module is designed exclusively for the S7-200 SMART platform. The expansion bus connector and protocol are not compatible with S7-200 Classic CPUs (e.g., CPU 224, CPU 226).
Q: Can relay outputs switch AC and DC loads on the same module simultaneously?
A: Yes. Each relay output is independently isolated, so different output points can switch different voltage levels (e.g., some points at 24 VDC, others at 230 VAC) within the same module, provided the per-point current rating is not exceeded.
Q: What is the maximum number of this module that can be connected to one CPU?
A: Up to 6 expansion modules total per CPU. The mix of module types is flexible; however, the total 5 VDC bus current draw of all expansion modules must not exceed the CPU’s expansion bus current budget (refer to the specific CPU datasheet).
Q: Does this module support high-speed (HSC) or pulse output functions?
A: No. High-speed counter inputs and pulse train outputs (PTO/PWM) are available only on the onboard I/O of the S7-200 SMART CPU. Expansion module I/O operates at standard scan-cycle speed only.
Q: What programming software is required?
A: STEP 7-Micro/WIN SMART V2.3 or later. The software is available as a free download from Siemens Industry Online Support.
Q: Is a firmware update required after installation?
A: No firmware update is required for the expansion module itself. Ensure the CPU firmware is V2.3 or later for full compatibility with all S7-200 SMART expansion modules.
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