S7-200 Series Standard PLC
Siemens S7-200 compatible PLC for machine control and retrofit projects. Multiple CPU options (Relay/Transistor, 220VAC/24VDC) and expansion support for digital, analog and temperature modules.
RS485 (PPI / Modbus RTU)
Optional Ethernet (-ETH)
Up to 7 Expansion Modules
Analog I/O Options
Quick Select
Need Ethernet?
Choose CPU226-*-ETH for fast download/monitoring and Modbus TCP ready networking.
Need Analog I/O?
Choose CPU228 (4AI/2AO) or add analog expansion modules (AI/AO).
Relay or Transistor?
-R for general loads; -T for high-speed switching.
Key Advantages
Siemens S7-200 Compatible
Ideal replacement for legacy S7-200 systems and machine retrofit projects.
Ethernet Option (-ETH)
Built-in Ethernet models for faster programming/monitoring and networking integration.
Flexible Expansion
Supports up to 7 modules: DI/DO, AI/AO, temperature (RTD/TC), mixed I/O.
Industrial Reliability
Stable design for panel mounting, long-term operation in industrial environments.
Popular Models
CPU226-*-ETH
Ethernet
- Digital I/O: 24 DI / 16 DO
- Power supply: 220VAC (Relay) / 24VDC (Transistor)
- Ethernet for programming/monitoring and networking integration
Tips: “-R” = relay output, “-T” = transistor output, “-ETH” = built-in Ethernet. Replace links above with your actual WooCommerce product URLs.
Model Selection (S7-200 Series Standard PLC)
Models listed vertically for better layout on all screens. Click model name to view product details.
| Model | DI | DO | AI | AO | RS485 | Ethernet | Power |
|---|---|---|---|---|---|---|---|
| CPU222-R / CPU222-T | 8 | 6 relays / transistors | None | None | 1 | None | Relay: 220VAC Transistor: 24VDC |
| CPU222-R-ETH / CPU222-T-ETH | 8 | 6 relays / transistors | None | None | 1 | 1 port (10/100M adaptive) | Relay: 220VAC Transistor: 24VDC |
| CPU224-R / CPU224-T | 14 | 10 relays / transistors | None | None | 2 | None | Relay: 220VAC Transistor: 24VDC |
| CPU224XP-R / CPU224XP-T | 14 | 10 relays / transistors | 2 | 1 | 2 | None | Relay: 220VAC Transistor: 24VDC |
|
CPU224XP-RT
Mixed output
|
14 | 4 transistors + 6 relays | 2 | 1 | 2 | None | Relay: 220VAC Transistor: 24VDC |
| CPU224XP-R-ETH / CPU224XP-T-ETH | 14 | 10 relays / transistors | 2 | 1 | 2 | 1 port (10/100M adaptive) | Relay: 220VAC Transistor: 24VDC |
| CPU225-R / CPU225-T | 14 | 10 relays / transistors | 4 | 2 | 2 | None | Relay: 220VAC Transistor: 24VDC |
| CPU226-R / CPU226-T | 24 | 16 relays / transistors | None | None | 2 | None | Relay: 220VAC Transistor: 24VDC |
| CPU226-R-ETH / CPU226-T-ETH | 24 | 16 relays / transistors | None | None | 2 | 1 port | Relay: 220VAC Transistor: 24VDC |
| CPU228-R / CPU228-T | 16 | 14 relays / transistors | 4 | 2 | 3 | None | Relay: 220VAC Transistor: 24VDC |
Legend: DI = Digital Inputs, DO = Digital Outputs, AI = Analog Inputs, AO = Analog Outputs.
“-R” = Relay output, “-T” = Transistor output, “-ETH” = Built-in Ethernet.
Communication & I/O
RS485 Protocols
- PPI communication for S7-200 compatible networking
- Modbus RTU for HMI/SCADA/drive integration
- Free-port protocol for custom serial devices
Ethernet (-ETH Models)
- Fast program download/upload & online monitoring
- Easy integration with Ethernet-based HMI/SCADA systems
- Suitable for networking upgrades and remote diagnostics
Analog I/O (Where Applicable)
CPU228 provides 4AI / 2AO on-board analog.
For additional channels, use compatible analog expansion modules (AI/AO).
(If you want, I can add a dedicated block that lists your analog/temperature module SKUs with product links.)
Expansion Modules (Up to 7)
Expand digital I/O, analog signals and temperature measurement. Ideal for machine upgrades, retrofit, and control cabinet standardization.
Digital I/O
DI: 8 / 16 / 32
DO: Relay or Transistor 8 / 16 / 32
Mixed: I4Q4, I8Q8, I16Q16
DO: Relay or Transistor 8 / 16 / 32
Mixed: I4Q4, I8Q8, I16Q16
Distributor/OEM Note: We can help you build a standard BOM (CPU + modules + wiring) for faster stocking and delivery.
Typical Applications
Machine Retrofit
Replace legacy S7-200 PLC while keeping control logic and wiring changes minimal.
Packaging & Conveying
Counting, interlocking, speed control, and small line automation.
Temperature Control
RTD/TC expansion for heaters, ovens, drying systems and process control.
HMI/SCADA Integration
RS485 Modbus RTU or Ethernet (-ETH) for data monitoring and remote maintenance.
FAQ
Is it compatible with Siemens S7-200 programming?
Yes. It is designed for S7-200 compatible logic and common retrofit requirements. Share your existing CPU model and I/O list for a recommended replacement plan.
What is the difference between Relay (-R) and Transistor (-T)?
Relay outputs are universal for many loads; transistor outputs are preferred for high-speed switching and long cycle applications.
How many expansion modules can I connect?
Up to 7 right-side expansion modules are supported (digital, analog, temperature, mixed I/O).
Can I use Ethernet for HMI/SCADA?
Yes. Choose -ETH models such as CPU226-*-ETH for Ethernet-based integration and faster engineering workflows.
Datasheet & Manuals
Download user manual, wiring reference and communication examples. If you need a specific document version, contact our engineers.
Need Selection Help or a Quote?
Send us: your current S7-200 CPU model, DI/DO/AI/AO count, power supply requirement (220VAC or 24VDC), and whether you need Ethernet (-ETH). We will reply with 1–2 recommended solutions and a wiring suggestion.