Siemens 6ES5095-8MA01 S5-95U PLC CPU Module
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Product Information
The Siemens 6ES5095-8MA01 is an S5-95U PLC CPU module from the SIMATIC S5 product family. This compact controller operates from a 24 V DC supply and combines 16 digital inputs, 16 digital outputs and 8 analog inputs in one unit. Four digital inputs support interrupt-capable operation, while the digital outputs provide 24 V DC switching at up to 0.5 A per channel. The CPU is designed for maintaining established Siemens S5 automation systems with integrated I/O and SIMATIC S5-100U expansion capability.
Replacement commissioning is carried out through the integrated 15-pin Sub-D PG interface, which uses a TTY/current-loop connection for programming, commissioning and diagnostics. Siemens STEP 5 is used to maintain the PLC program and transfer it through the PG interface. Programs can be held in internal RAM with battery backup, while optional EPROM or EEPROM memory modules provide additional program storage and transfer options. When preparing a spare, check the installed CPU designation, I/O requirements, memory configuration, PG cable arrangement and connection to the SIMATIC S5-100U I/O bus.
The 6ES5095-8MA01 supports service diagnostics through STEP 5, including access to DB1 system parameters and analysis of the error stack. For a failed CPU, connect the programming device through the 15-pin TTY/PG interface, check the stored program and system parameters, and review the error stack before returning the replacement to service. This Siemens S5-95U CPU is discontinued, making a correctly matched repair or tested exchange unit relevant for restoring existing machinery and legacy automation equipment.
Technical Specifications
| Manufacturer | Siemens |
| Part number | 6ES5095-8MA01 |
| Model/type | S5-95U |
| Product family | SIMATIC S5 |
| Component type | PLC CPU module |
| Lifecycle status | Discontinued |
| Supply voltage | 24 V DC |
| Digital inputs | 16 channels |
| Interrupt-capable inputs | 4 channels |
| Digital outputs | 16 channels |
| Digital output voltage | 24 V DC |
| Digital output current | 0.5 A per channel |
| Analog inputs | 8 channels |
| Programming interface | PG interface, 15-pin Sub-D TTY/current-loop |
| Interface function | Programming, commissioning, and diagnostics |
| Expansion bus | SIMATIC S5-100U I/O bus |
| Engineering software | STEP 5 |
| Diagnostic access | DB1 system parameters and error stack analysis via STEP 5 |
| Program storage | Internal RAM with battery backup; optional EPROM or EEPROM memory module |
Programming and Configuration
Siemens STEP 5 is the engineering environment for programming, commissioning and servicing the S5-95U CPU. Program upload and download are performed through the integrated 15-pin Sub-D PG interface using a TTY/current-loop connection.
The PLC program can be maintained in internal RAM with battery backup. Optional EPROM or EEPROM memory modules provide additional storage and transfer options when preparing or replacing a CPU. During spare-unit commissioning, transfer the required program and check the DB1 system parameters through STEP 5 before returning the controller to operation.
Communication and System Integration
The 15-pin Sub-D PG interface provides the connection for programming, commissioning and diagnostics. It uses a TTY/current-loop connection for communication with the programming device.
The CPU connects to SIMATIC S5-100U I/O expansion modules through the SIMATIC S5-100U I/O bus. Compatibility checks should therefore include the installed expansion architecture as well as the CPU part number and integrated I/O requirements.
Diagnostics and Status Indication
Service diagnostics for the Siemens S5-95U are performed with STEP 5 through the 15-pin TTY/PG interface. The diagnostic functions include access to DB1 system parameters and analysis of the PLC error stack.
For troubleshooting, connect the programming device, review the error stack and inspect the DB1 system parameters. Program upload and download through the PG interface support restoration of the controller configuration when replacing a failed CPU.
Replacement and Spare Part Considerations
The Siemens 6ES5095-8MA01 is a discontinued S5-95U CPU module for existing SIMATIC S5 installations. Before selecting a replacement, match the complete part number and confirm the required 24 V DC supply, integrated I/O arrangement, memory configuration and SIMATIC S5-100U expansion connections.
Commissioning a spare may require the existing STEP 5 program, DB1 system parameters and the appropriate PG cable arrangement. Check whether the installation uses internal RAM with battery backup or an optional EPROM or EEPROM memory module, then transfer the required program through the 15-pin TTY/PG interface and review the error stack before operation.
Frequently Asked Questions
What is the Siemens 6ES5095-8MA01?
The 6ES5095-8MA01 is an S5-95U PLC CPU module from the Siemens SIMATIC S5 product family. It includes 16 digital inputs, 16 digital outputs and 8 analog inputs.
What supply voltage does the S5-95U CPU use?
The Siemens 6ES5095-8MA01 operates from a 24 V DC supply.
Which software is used to program and diagnose this PLC CPU?
Siemens STEP 5 is used for programming, commissioning and diagnostics. It provides access to DB1 system parameters and error-stack analysis.
How is the 6ES5095-8MA01 connected to a programming device?
Programming, commissioning and diagnostics use the integrated 15-pin Sub-D PG interface with a TTY/current-loop connection.
Can the S5-95U be expanded with additional I/O?
The CPU supports SIMATIC S5-100U I/O expansion modules through the SIMATIC S5-100U I/O bus.
What should be checked when replacing a failed 6ES5095-8MA01?
Match the complete part number and check the 24 V DC supply, integrated I/O, memory configuration, PG cable arrangement, STEP 5 program, DB1 system parameters and S5-100U expansion connections before commissioning the spare.
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