Siemens 6ES5377-0AA41 Memory Module

The 6ES5377-0AA41 expands program memory for SIMATIC S5 CPUs. This module stores user logic, data blocks, and system parameters. It plugs directly into the memory slot on S5 processors.

Key Technical Specifications

Parameter	Value
Memory Type	Static RAM (SRAM)
Memory Capacity	4 KB
Supply Voltage	5V DC from backplane
Supply Current	50 mA typical
Backup Battery	3.6V lithium (external)
Data Retention	3 years with fresh battery
Access Time	150 ns
Board Dimensions	5.5 cm x 3.8 cm x 1.2 cm
Weight	0.05 kg (0.11 lbs)
Component Count	12 integrated circuits
Operating Temperature	0°C to 60°C

Physical Dimensions and Component Layout

This module measures 5.5 cm in length and 3.8 cm in width. Its total height reaches 1.2 cm including the edge connector. 6ES5377-0AA41 weighs just 0.05 kg for easy insertion. You will find 12 ICs and several passive components on a two-layer PCB.

Furthermore, the module includes a socket for an external backup battery. This battery maintains memory contents when the system powers off. The PCB uses gold-plated edge contacts for reliable connections.

Memory Architecture and Access

The SRAM chip provides 4 KB of non-volatile programmable storage. You can store up to 2000 instructions and 200 data words. The CPU accesses this memory with a 150 ns access time. Consequently, the module supports fast scan cycles without wait states.

Connector Interface and Installation

A 64-pin gold-plated edge connector plugs into the CPU memory slot. The module aligns with keying slots to prevent incorrect insertion. You do not need any tools for installation or removal. A plastic ejector latch helps you remove the module safely.

Typical Application Scenarios

You can deploy 6ES5377-0AA41 in SIMATIC S5-115U, 135U, and 155U systems. It also works well for S5-95U compact controllers needing extra memory. This module stores ladder logic, statement lists, and function block data. Its 4KB capacity suits medium-sized automation tasks like conveyor control.