The Siemens 6ES5942-7UA11 SIMATIC S5 CPU 942 delivers powerful processing capabilities for complex automation tasks. This advanced controller handles extensive I/O configurations and sophisticated program execution efficiently. Its compact housing measures 140 mm in height, 50 mm in width, and 135 mm in depth.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Model | 6ES5942-7UA11 |
| Category | CPU Module / SIMATIC S5 Processor |
| Processor Type | 16-bit microcontroller |
| Program Memory | 32 KB (RAM, battery-backed) |
| Data Memory | 16 KB (RAM, battery-backed) |
| EPROM Capacity | 32 KB (external memory card) |
| Cycle Time | 1.0 ms per 1,000 instructions |
| Maximum I/O Points | 1,024 (digital) / 128 (analog) |
| Number of Timers | 128 |
| Number of Counters | 128 |
| Communication Ports | 1 × RS-232 (programming), 1 × RS-485 |
| Power Consumption (5 V) | 3.5 W |
| Backplane Current Draw | 700 mA (at 5 V) |
| Battery Type | Lithium (3.6 V) |
| Battery Life | 3 years (typical) |
| Dimensions (H×W×D) | 140 × 50 × 135 mm |
| Weight | 0.45 kg |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | –25°C to +85°C |
| Protection Rating | IP20 |
| Mounting Type | DIN rail (35 mm) |
| Component Count | 84 components |
Processing Speed and Program Execution
The Siemens 6ES5942-7UA11 achieves a cycle time of 1.0 ms for 1,000 Boolean instructions. This speed supports demanding logic and arithmetic operations for complex control tasks. The processor handles bit, word, and floating-point data types effectively. Users can implement sophisticated control strategies without impacting scan cycle performance.
Memory Architecture and Program Storage
This CPU provides 32 KB of RAM for user program storage with battery backup. The data memory stores process variables, timers, and counter values securely. An external EPROM slot accepts memory cards up to 32 KB for program backup. The battery retains program and data content for up to three years during power outages.
I/O Capacity and System Expansion
The Siemens 6ES5942-7UA11 supports up to 1,024 digital and 128 analog I/O points. Users can distribute I/O across multiple expansion racks via S5 bus connections. This capacity suits medium to large-scale automation projects across various industries. The processor manages both local and remote I/O configurations effectively.
Timers, Counters, and System Resources
This controller integrates 128 timers and 128 counters for flexible control logic implementation. The timers support on-delay, off-delay, and retentive timing functions. Counters accommodate up, down, and up/down counting operations. Such rich resource availability simplifies programming for complex sequential control applications.
Communication and Programming Interface
The Siemens 6ES5942-7UA11 includes an RS-232 port for programming and diagnostic access. This interface connects to Siemens PG programming devices or PC adapters. An RS-485 port supports communication with other S5 processors and remote I/O racks. The module exchanges data with higher-level systems through this connection.
Power Consumption and Battery Backup
The CPU draws 3.5 W from the 5 V backplane supply during standard operation. The 3.6 V lithium battery maintains RAM content during power outages. Battery life reaches three years under typical operating conditions. An integrated low-battery indicator warns users when replacement becomes necessary.
Diagnostic Features and Status Indication
Front-panel LEDs display CPU operating status, program execution, and fault conditions. These indicators help technicians diagnose system problems quickly. The processor logs error events in an internal diagnostic buffer. Users can access these logs through programming software for detailed troubleshooting.
Details
| Weight | 0.12 kg |
|---|---|
| Dimensions | 120 × 80 × 3 mm |
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