Description
Product Introduction
The Siemens 6ES7623-1SB01-0AC0 (SIMATIC C7-623) is a legacy integrated control unit that fuses the processing power of a SIMATIC S7-300 controller (equivalent to CPU 314 performance) with a text-based operator interface. Designed for machine-level automation, small machine tools, and process skids, this space-saving unit eliminates the need for separate PLC hardware, panel cutouts, and interconnecting serial cables.
Programmed using Siemens STEP 7 (V5.x) alongside ProTool or WinCC flexible for HMI screen design, the C7-623 handles discrete logic, analog loop control, and operator message handling directly from the front panel. In our field experience, replacing a failed unit with an exact 6ES7623-1SB01-0AC0 module lets technicians restore machine operation by transferring the existing memory card (Micro Memory Card / Memory Card) or reloading the STEP 7 project without hardware retrofitting.
Key Technical Specifications
| Parameter | Value |
| Part Number | 6ES7623-1SB01-0AC0 |
| Manufacturer | Siemens SIMATIC Industrial Automation |
| System Family | SIMATIC C7 (C7-623 Integrated Unit) |
| CPU Equivalent | S7-300 CPU 314 Architecture |
| Display Type | Backlit LCD, 4 Lines \times 20 Characters |
| User Interface | Integrated Membrane Keypad (Function Keys, Numeric/Navigation Keys) |
| Communication Ports | MPI (Multi-Point Interface) / Built-in Interfaces |
| I/O Expansion | Expandable via standard SIMATIC S7-300 I/O modules (SM 321, SM 322, etc.) |
| Supply Voltage | 24 VDC |
Application Scenarios & The “Trench” Experience
A packaging facility experienced an unexpected breakdown when the display backlight on a food tray sealing machine went completely dark and the integrated controller stopped executing sequence steps. Operators could not clear fault alarms or adjust temperature setpoints. Diagnostics showed that heat buildup inside the operator enclosure had degraded the power supply stage on the C7-623 mainboard.
- OEM Machine Building – Standalone Packaging & Wrapping Equipment – Executes multi-axis step sequences while displaying line speed and alarm messages.
- Process Skids – Chemical Dosing & Filtration Skids – Adjusts pump speed setpoints and displays flow diagnostics via character screens.
- Material Handling – Conveyor & Sorting Stations – Manages discrete I/O interlocks while allowing manual jog routines from the keypad.
The maintenance team swapped out the damaged unit with a bench-tested 6ES7623-1SB01-0AC0 surplus unit. They transferred the original memory card into the replacement C7-623, reconnected the 24VDC power plug and S7-300 backplane ribbon expansion connector, and brought the packaging line back online in under 30 minutes.
6ES7623-1SB01-0AC0
6ES7623-1SB01-0AC0
Transparency SOP: Quality Assurance & Testing
Every 6ES7623-1SB01-0AC0 unit undergoes rigorous bench testing before dispatch:
- Visual & Keypad Inspection: Checking housing latches, terminal blocks, front display glass, and testing membrane key tactile response.
- Power-On & Display Backlight Test: Verifying 24VDC power supply startup, display contrast, and LCD backlight stability.
- Memory Card & Flash Load Verification: Testing Memory Card (MC) reading/writing functions and verifying project memory retention.
- MPI Communication Check: Connecting via PC Adapter to verify online communication with STEP 7 and ProTool / WinCC Flexible software.
- ESD Protective Packaging: Enclosing the unit in anti-static ESD bags with custom protective foam padding for transit.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Backup Your Program & HMI Project First: The C7-623 contains two software components: the S7 CPU logic block and the ProTool/WinCC Flexible HMI project file. When retrieving code from an old unit, remember that uploaded PLC code will not include HMI screen graphics unless you have the original source project files.
- ❗ Check S7-300 Expansion Cable Connections: If your setup uses external S7-300 I/O modules via an expansion cable (like the 6ES7793 series), ensure the connector pins are fully seated and strain-relieved. Loose expansion connectors can trigger random “I/O Bus Error” stops on the CPU.
- ⚠️ Verify Memory Card Compatibility: Use only compatible Siemens SIMATIC Memory Cards formatted for S7-300/C7 CPUs. Inserting an incorrectly formatted card or third-party card can cause the CPU to enter a permanent STOP condition with fault LED indications.
Frequently Asked Questions (FAQ for Conversion)
Q: What programming software is required for the 6ES7623-1SB01-0AC0?
A: The PLC engine is programmed using Siemens STEP 7 (V5.x), while the integrated operator display screens are configured using Siemens ProTool or WinCC flexible (Compact/Standard edition).
Q: Can I expand the I/O capacity of this unit?
A: Yes. The C7-623 can be expanded by connecting standard SIMATIC S7-300 I/O modules (SM series) using appropriate expansion bus connectors or cables.
Q: Is the 6ES7623-1SB01-0AC0 still in active production by Siemens?
A: No. The SIMATIC C7 series has been declared obsolete by Siemens. Replacement units are primarily available through high-quality surplus, reconditioned, or repair channels.
Q: How do I transfer the program from a failed unit to this replacement?
A: If the original unit used a Siemens Memory Card, simply insert the card into the memory slot of the replacement 6ES7623-1SB01-0AC0. Otherwise, download the project file from your STEP 7 / ProTool engineering backup.
Q: What warranty comes with this surplus Siemens C7 unit?
A: Every surplus and fully tested 6ES7623-1SB01-0AC0 module is backed by our full 12-month replacement warranty.
Start Chat
