Siemens 6ES5948-3UA12 CPU Module | 16-Bit

This Siemens CPU module serves as the intelligent core for S5 automation systems. The Siemens 6ES5948-3UA12 executes user programs with high-speed processing capabilities. Its advanced architecture handles complex control tasks efficiently. This module supports both bit and word operations for versatile programming. The Siemens 6ES5948-3UA12 integrates seamlessly into any S5 rack configuration.

Physical Dimensions and Mounting Details

The CPU module measures 232 mm in height and 25 mm in width. Its overall depth reaches 160 mm including the front connector. This unit weighs approximately 0.58 kilograms for stable rack installation. The housing features a robust metal casing for electromagnetic shielding. The Siemens 6ES5948-3UA12 plugs directly into any S5 rack slot. A 48-pin backplane connector transfers power and signals to the system.

Processor and Memory Architecture

A 16-bit microprocessor with 10 MHz clock speed handles all computational tasks. This processor executes bit operations in 0.2 microseconds for rapid response. Word operations complete in 0.8 microseconds for efficient data handling. The unit includes 96 KB of RAM for user program and data storage. A separate 192 KB EPROM holds the operating system firmware. The Siemens 6ES5948-3UA12 provides 48 KB of retentive memory for critical data. An integrated lithium battery maintains this memory for up to 5 years. An internal capacitor of 680 µF bridges brief power interruptions.

Communication and System Capabilities

This CPU offers one RS-232 port for programming device connection. A second RS-485 interface supports remote I/O and inter-controller communication. The unit handles up to 1024 digital I/O points for system flexibility. It also manages up to 128 analog channels for process monitoring. The Siemens 6ES5948-3UA12 processes 1024 instructions in approximately 1.8 milliseconds. Six interrupt inputs enable priority-based event handling. A watchdog timer monitors program execution continuously.

Detailed Specification Table

Parameter	Specification
Dimensions (H x W x D)	232 mm x 25 mm x 160 mm
Weight	Approx. 0.58 kg
Processor Type	16-bit microprocessor
Clock Frequency	10 MHz
Bit Operation Time	0.2 µs
Word Operation Time	0.8 µs
RAM Capacity	96 KB
EPROM Capacity	192 KB
Retentive Memory	48 KB
Battery Backup Life	5 years
Energy Storage Capacitance	680 µF
Digital I/O Capacity	1024 points
Analog Channel Capacity	128 channels
Program Execution Time	1.8 ms / 1024 instructions
Communication Ports	RS-232, RS-485
Interrupt Inputs	6

Application and Commissioning Guidelines

Insert this CPU into the designated slot of the S5 rack system. Connect the programming device to the RS-232 port for initial setup. Download the user program and system parameters via the serial interface. The Siemens 6ES5948-3UA12 operates reliably between 0°C and 60°C. Ensure sufficient airflow around the CPU for proper heat dissipation. Configure the communication settings to match peripheral device requirements. Monitor the front-panel LEDs for system status and fault indicators. Replace the backup battery every four years to prevent memory loss.