Siemens 6ES5372-1AA61 – EPROM Module for SIMATIC S5 Program Storage

The Siemens 6ES5372-1AA61 stores user programs in permanent non-volatile memory for S5 controllers. This EPROM module measures 250 mm in depth and 25 mm in width. It fits standard SIMATIC S5 rack slots without any modifications. The unit weighs 0.12 kg, making installation quick and effortless.

Storage Capacity and Memory Technology

This EPROM module holds 32 kB of user program data in read-only memory. The Siemens 6ES5372-1AA61 uses UV-erasable EPROM chips for reliable long-term storage. You can erase the memory content using an ultraviolet light eraser device. The module retains stored data for over 20 years without any battery backup. It stores complete program blocks, function blocks, and system parameters permanently.

Internal Architecture and Component Layout

The module contains one main circuit board with four EPROM chips. The Siemens 6ES5372-1AA61 includes address decoding logic for memory mapping. A 48-pin edge connector interfaces with the S5 backplane for data access. The module requires no power supply for data retention after programming. It stores 22 µF of capacitance for signal filtering only.

Programming Requirements and Compatibility

You need an external EPROM programmer to write data to this module. The Siemens 6ES5372-1AA61 supports programming voltages of 12.5V and 21V. The module works with all S5 CPU models from 115U to 155U series. It also fits into S5 expansion racks for remote program storage. A write-protect feature prevents accidental data corruption during operation.

Environmental Tolerance and Physical Specifications

The Siemens 6ES5372-1AA61 operates reliably from 0°C to 60°C ambient temperature. It tolerates humidity levels up to 95 percent without any condensation issues. The module withstands vibration up to 2g from 10 to 500 Hz. A quartz window on each EPROM chip allows UV light for erasure. You must cover this window with an opaque label after programming.

Below is a complete summary of its technical specifications.

The Siemens 6ES5372-1AA61 replaces older EPROM modules in S5-115U and S5-135U systems. You do not need any battery replacement or maintenance for this module. This unit provides secure program storage immune to power loss or electrical noise. Consequently, it suits critical applications where battery-backed RAM poses a reliability risk.