SIEMENS 6ES7212-1AB23-0XB8 — CPU 212 DC/DC/DC Power Supply Module | S7-200 Series
Engineering Background
The SIEMENS S7-200 Micro PLC series has been a cornerstone of compact automation since the mid-1990s, deployed across millions of machines worldwide in manufacturing, building automation, and process control. The 6ES7212-1AB23-0XB8 is the CPU 212 variant featuring an integrated 24 VDC power supply, DC digital inputs, and DC transistor outputs — the preferred configuration for high-speed, noise-sensitive industrial environments.
Product Positioning
This module is the entry-level CPU of the S7-200 family, purpose-built for standalone machine control, small conveyor systems, and distributed I/O nodes where footprint and cost are critical constraints. Its onboard I/O, integrated power supply, and STEP 7-Micro/WIN programming environment make it a self-contained control solution requiring no additional CPU or power supply rack.
Complete Technical Specifications
| Order Number (MLFB) | 6ES7212-1AB23-0XB8 |
| Series | SIMATIC S7-200 |
| CPU Type | CPU 212 |
| Power Supply Input | 24 VDC (20.4 – 28.8 VDC) |
| Supply Current (5 VDC bus) | 340 mA max |
| Digital Inputs (onboard) | 8 × DC 24 V (sink/source) |
| Digital Outputs (onboard) | 6 × DC 24 V transistor, 0.75 A per point |
| Program Memory | 1 KB (EEPROM) |
| Data Memory | 1 KB |
| Execution Speed | 1.2 ms / 1K Boolean instructions |
| High-Speed Counters | 2 × 2 kHz single-phase |
| Pulse Outputs | 2 × PWM / PTO, up to 2 kHz |
| Communication Port | 1 × RS-485 (PPI / MPI compatible) |
| Real-Time Clock | Optional (via expansion module) |
| Expansion Modules | Up to 2 EM modules |
| Dimensions (W×H×D) | Approx. 90 × 80 × 62 mm |
| Weight | ~700 g (with packaging) |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -40 °C to +70 °C |
| Relative Humidity | 5 % to 95 % (non-condensing) |
| Protection Class | IP20 |
| Certifications | CE, UL, cUL, FM |
| Programming Software | STEP 7-Micro/WIN V4.0 SP9 or later |
Proven Application Environments
- Conveyor & Material Handling: Standalone belt conveyor sequencing with sensor-driven start/stop logic and fault interlocking.
- Packaging Machinery: Cycle-based fill-and-seal control with PWM output for servo-less speed regulation.
- HVAC & Building Automation: Fan coil unit control, damper positioning, and occupancy-based scheduling.
- Water Treatment: Pump sequencing, level monitoring, and dosing control in compact skid installations.
- OEM Machine Builders: Cost-optimized embedded controller for machines with ≤8 DI / ≤6 DO requirements.
- Retrofit & Replacement: Drop-in replacement for aging CPU 212 units in legacy S7-200 panels without rewiring.
Engineering Advantages
- Integrated DC Power Supply: Eliminates a separate 24 VDC PSU, reducing panel footprint and BOM cost.
- Transistor Outputs: Faster switching (<1 ms), longer service life, and compatibility with high-frequency PWM/PTO applications versus relay variants.
- EEPROM Program Retention: Program survives power loss without battery backup — critical for unattended remote installations.
- RS-485 PPI Port: Native support for SIEMENS HMI panels (TD 200, TP070), PC programming via PC/PPI cable, and multi-master MPI networks.
- Compact DIN-Rail Form Factor: Fits standard 35 mm DIN rail; minimal panel depth requirement.
- Wide Input Voltage Tolerance: 20.4–28.8 VDC range accommodates voltage sag in long cable runs and battery-backed systems.
System Architecture & Signal Flow
The 6ES7212-1AB23-0XB8 operates as the master node on a PPI single-master network. The 24 VDC supply feeds the internal 5 VDC bus regulator, powering the CPU core and up to 2 downstream EM expansion modules via the local bus connector. Digital inputs are optically isolated and sampled at the start of each scan cycle into the Process Image Input (PII) table. The CPU executes the user program from EEPROM, writes results to the Process Image Output (PIO) table, and drives the transistor output stage at the end of each scan. High-speed counter (HSC) and PTO/PWM functions bypass the scan cycle and operate in hardware interrupt mode for deterministic response.
Sourcing & Quality Verification
- Origin: Genuine SIEMENS production; sourced through authorized distribution and verified secondary-market channels.
- Inspection: Each unit undergoes visual inspection, label authenticity check (hologram, laser engraving, date code), and power-on functional verification prior to dispatch.
- Condition: New-in-box (NIB) or factory-refurbished units available — condition specified at order confirmation.
- Documentation: Certificate of conformity and test report available upon request for regulated industries.
- Packaging: Anti-static bag + foam-lined carton; humidity indicator card included for long-haul shipments.
Procurement Process
- Step 1 — Inquiry: Submit your BOM or part number via the order form or email [email protected].
- Step 2 — Quote: Receive a formal quotation with unit price, lead time, and shipping options within 1 business day.
- Step 3 — Order Confirmation: Confirm PO; payment via T/T, PayPal, or credit card accepted.
- Step 4 — Dispatch: Units ship within 1–3 business days from Xiamen, China via DHL / FedEx / SF Express.
- Step 5 — After-Sales: 12-month warranty on verified genuine units; DOA replacement within 7 days of receipt.
Technical FAQ
Q: Is the 6ES7212-1AB23-0XB8 still in production?
A: This CPU 212 variant has been discontinued by SIEMENS. Konmask.com maintains stock of genuine new and refurbished units to support legacy system maintenance and panel retrofits.
Q: Can I expand I/O beyond the onboard 8DI/6DO?
A: Yes. The CPU 212 supports up to 2 EM expansion modules (e.g., EM 221 for additional DI, EM 222 for DO, EM 231/232 for analog I/O), extending the system to a maximum of 64 I/O points.
Q: What programming cable is required?
A: A PC/PPI cable (6ES7901-3CB30-0XA0) or USB-PPI adapter is required to connect a PC running STEP 7-Micro/WIN to the RS-485 port.
Q: Is this compatible with TIA Portal?
A: No. The S7-200 series is programmed exclusively with STEP 7-Micro/WIN. TIA Portal supports S7-1200 and above. For TIA Portal compatibility, consider the SIEMENS S7-1200 CPU 1211C.
Q: What is the difference between the -0XB0 and -0XB8 suffix?
A: The suffix denotes the firmware/hardware revision. The -0XB8 is a later revision with improved EMC performance and minor firmware enhancements. It is functionally interchangeable with earlier revisions in most applications.
Q: Can I use this module in a safety-rated application (SIL/PLd)?
A: No. The S7-200 CPU 212 is a standard (non-safety) controller. For functional safety applications, SIEMENS ET 200S with F-CPU or S7-300/400F series should be specified.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: [email protected] | +0086 19859288691
