Siemens 6ES5370-0AA31 Memory Submodule

This memory submodule stores user programs for SIMATIC S5 central controllers. It holds your automation logic permanently without any external power source. You can insert this unit into any S5 CPU memory slot.

Technical Specifications

Parameter	Details
Brand	Siemens
Model	Siemens 6ES5370-0AA31
Category	Memory Submodule (SIMATIC S5 Series)
Dimensions (H x W x D)	32 mm x 68 mm x 12 mm
Weight	0.02 kg (20 grams)
Memory Type	EPROM (Erasable Programmable Read-Only Memory)
Storage Capacity	1 KB
Number of Components	1 EPROM chip + 1 small PCB assembly
Interface Type	28-pin edge connector
Access Time	250 ns (typical)
Data Retention	Over 10 years without any power supply
Write Cycles	100 times (erase requires UV light)
Erasure Method	Ultraviolet light at 254 nm for 15 minutes
Operating Voltage	5 V DC ±5%
Current Draw	60 mA (read mode) / 1 µA (standby)
Built-in Energy Storage	None (non-volatile EPROM technology)
Protection Features	Adhesive label over quartz erasure window
Operating Temperature	0°C to 70°C
Humidity Tolerance	10% to 90% non-condensing

Detailed Feature Overview

This submodule provides 1 KB of permanent program storage for S5 CPUs. It retains your automation code for over a decade without batteries. Consequently, you never worry about data loss during long power outages.

The access time reaches 250 ns for fast program execution on startup. You can read the memory contents instantly after applying power. A quartz window on top allows UV light to erase the chip for reprogramming.

You will find a protective sticker covering the quartz erasure window. Remove this sticker only when you need to erase the submodule. Exposure to sunlight or fluorescent light can corrupt the stored data gradually.

Installation and Compatibility

Siemens 6ES5370-0AA31 fits S5 CPUs like 6ES5944, 6ES5130, and 6ES5105. Insert the submodule into the designated memory slot with correct orientation. Use a UV eraser lamp for 15 minutes to clear existing data.