Siemens 6ES5095-8MA03 S5-95U Compact PLC CPU
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Product Information
The Siemens 6ES5095-8MA03 is an S5-95U compact PLC CPU from the SIMATIC S5 product family. It combines the controller, 16 KB of STEP 5 program memory and integrated I/O for legacy industrial automation equipment. The 24 V DC CPU provides 16 digital inputs, 16 digital outputs, 8 analog inputs and 1 analog output supporting 0-20 mA or voltage signals. Two high-speed counter inputs and four dedicated interrupt inputs support responsive machine control.
A replacement CPU uses the integrated 7-pin TTY current-loop interface with a 20 mA signal for Siemens PG Protocol communication, STEP 5 programming, HMI connection and online diagnostics. Program storage can use internal battery-backed RAM or an optional plug-in EPROM/EEPROM memory module. Before commissioning a spare, transfer or restore the STEP 5 program and confirm the installed memory submodule and connected SIMATIC S5-100U I/O configuration. The S5-95U also supports expansion with additional digital and analog I/O modules from the SIMATIC S5-100U family.
For troubleshooting, STEP 5 connected through the TTY interface provides online status monitoring and diagnostics, as well as program upload and download through the Siemens PG Protocol. Program backup and restoration can be performed with STEP 5 or a compatible memory submodule. With approximately 2 ms execution time per 1,000 instructions, 128 timers and 128 counters, including 8 battery-backed timers and 8 battery-backed counters, the 6ES5095-8MA03 is suited to maintaining installed S5 control systems. As SIMATIC S5 is discontinued, repair, a tested exchange unit or a correctly configured spare can help keep existing equipment operational.
Technical Specifications
| Manufacturer | Siemens |
| Part number | 6ES5095-8MA03 |
| Model/type | S5-95U |
| Product family | SIMATIC S5 |
| Component type | PLC CPU |
| Supply voltage | 24 V DC |
| Program memory | 16 KB |
| Program storage | Internal RAM with battery backup or optional plug-in EPROM/EEPROM memory module |
| Integrated digital inputs | 16 |
| Integrated digital outputs | 16 |
| Integrated analog inputs | 8 |
| Integrated analog outputs | 1 |
| Analog output signal | 0-20 mA or voltage |
| High-speed counter inputs | 2 |
| Interrupt inputs | 4 |
| Timers | 128 total, including 8 battery-backed |
| Counters | 128 total, including 8 battery-backed |
| Execution time per 1K instructions | Approximately 2 ms |
| Programming interface | TTY current loop, 20 mA |
| Programming connector | 7-pin |
| Communication protocol | Siemens PG Protocol via TTY |
| I/O expansion | Supports additional digital and analog I/O modules from the SIMATIC S5-100U family |
Programming and Configuration
The S5-95U is programmed with STEP 5 through the integrated 7-pin TTY current-loop interface. The interface uses a 20 mA signal and supports Siemens PG Protocol communication for program upload and download.
Program storage is available in internal RAM with battery backup or through an optional plug-in EPROM/EEPROM memory module. For a replacement CPU, restore the STEP 5 program from a backup or compatible memory submodule before returning the machine to service.
The CPU includes 16 KB of STEP 5 program memory. Configuration work should also account for the connected SIMATIC S5-100U digital and analog I/O modules and the installed memory hardware.
Communication and System Integration
The integrated 7-pin TTY current-loop interface provides 20 mA communication for Siemens PG Protocol. It is used for STEP 5 programming, HMI connection and online status monitoring and diagnostics.
The S5-95U can be expanded with additional digital and analog I/O modules from the SIMATIC S5-100U family. When replacing the CPU, match the spare to the installed I/O configuration and restore the program through the TTY connection or a compatible memory submodule.
Diagnostics and Status Indication
Online status monitoring and diagnostics are performed through STEP 5 connected to the CPU's 7-pin, 20 mA TTY interface. The Siemens PG Protocol also supports program upload and download through this connection.
For recovery work, STEP 5 or a compatible memory submodule can be used for program backup and restoration. These functions support checking the CPU configuration and restoring the control program after a replacement.
Replacement and Spare Part Considerations
Verify the exact Siemens part number 6ES5095-8MA03 and S5-95U model against the failed CPU before selecting a spare. The replacement must also match the installed SIMATIC S5-100U expansion modules, memory submodule arrangement and STEP 5 program requirements.
A spare is not simply a power-on replacement when the program is stored in RAM or when the installed machine configuration must be restored. Transfer the program through the 7-pin TTY interface using STEP 5, or use a compatible EPROM/EEPROM memory module, then check the integrated and expansion I/O configuration during commissioning.
SIMATIC S5 is discontinued, so repair and tested exchange options are relevant for maintaining installed equipment. ABC Industrial Parts can support preparation of a replacement or exchange unit using the available program and memory configuration.
Frequently Asked Questions
What is the Siemens 6ES5095-8MA03?
The 6ES5095-8MA03 is an S5-95U compact PLC CPU from the Siemens SIMATIC S5 product family. It has 16 KB of STEP 5 program memory, a 24 V DC supply and integrated digital and analog I/O.
Which programming interface does the S5-95U use?
The CPU uses a 7-pin TTY current-loop interface with a 20 mA signal. Siemens PG Protocol via TTY supports STEP 5 programming, program transfer, HMI connection and online diagnostics.
How is the program transferred to a replacement CPU?
The STEP 5 program can be uploaded or downloaded through the TTY interface, or restored using a compatible EPROM/EEPROM memory submodule. Internal RAM with battery backup is another program-storage option.
What I/O is integrated into the Siemens S5-95U?
The CPU provides 16 digital inputs, 16 digital outputs, 8 analog inputs and 1 analog output. The analog output supports 0-20 mA or voltage signals, and additional SIMATIC S5-100U digital and analog I/O modules can be connected.
How can the S5-95U be checked during troubleshooting?
Connect STEP 5 through the integrated 7-pin TTY interface to perform online status monitoring and diagnostics. STEP 5 or a compatible memory submodule can also be used for program backup and restoration.
Take advantage of our exchange formula
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Industrial plants prefer to keep running invariably, no matter what. Therefore, it is essential that you can rely on high-quality products and/or sustainable repairs. With our warranty conditions, you can count on certainty, whether you choose new, used or repaired products.
Data backup and recovery
Have you lost valuable parameters or data due to a malfunction while the manufacturer no longer provides support? At ABC Industrial Parts, we help you secure this data, both for common and specific products.
Specific firmware and hardware versions
If you are working with specific hardware or firmware versions that are no longer available from the manufacturer, ABC Industrial Parts is your partner. When making your enquiry, clearly state which versions you need, we will then look at the possibilities of supplying those versions, so that your installations continue to function optimally.
Disclaimer:
We are not an authorised distributor of Siemens.
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