Siemens 6ES5840-4SH01 | SIMATIC S5 Memory Module

The Siemens 6ES5840-4SH01 provides reliable program storage for your PLC. This memory module belongs to the SIMATIC S5 controller family. It inserts directly into the CPU or expansion rack. You can use it to store user logic and configuration data.

Key Technical Specifications

Below you will find the accurate technical parameters for the Siemens 6ES5840-4SH01.

Parameter	Specification
Product Type	Memory Module
Series	SIMATIC S5
Memory Type	RAM with battery backup
Storage Capacity	4 KB
Interface	Direct slot connection
Operating Voltage	5 V DC (from backplane)
Backup Battery	Lithium (integrated)
Manufacturer	Siemens

The module measures 68 mm in width and 100 mm in height. Its total depth reaches 18 mm. The Siemens 6ES5840-4SH01 weighs approximately 85 grams. This unit contains a single memory PCB with battery holder. Energy storage comes from the integrated lithium battery.

You will find a battery compartment on the top edge. The module retains all data when the main power shuts off. Consequently, your program remains safe during maintenance or outages. The battery typically lasts for five years of operation.

Installation and System Integration

You can plug the Siemens 6ES5840-4SH01 into any compatible S5 slot. The module draws operating power directly from the backplane bus. Therefore, you do not need any external cables at all. The CPU automatically recognizes this memory module upon startup.