The Siemens Simatic S5 6ES5942-7UF13 (CPU 942F) is a high-reliability, fail-safe central processing unit engineered specifically for the Simatic S5-115F automation system. This specialized processor utilizes dual-channel, redundant architecture to perform continuous cross-checking of execution logic and internal register states. Designed for critical safety-instrumented systems (SIS), the unit is capable of immediate transition to a secure, de-energized state upon detecting internal or external fault conditions.
Features
Dual-channel redundant processing architecture for high-integrity safety logic execution.
Continuous self-testing of the arithmetic logic unit (ALU), memory blocks, and internal bus communication.
Integrated fail-safe safety protocols for monitoring rack-mounted or remote digital I/O.
Master safety contact loop control for immediate isolation of field actuators during fault detection.
Integrated RAM with support for external EPROM/EEPROM memory modules.
Applications
This CPU is intended for use in high-risk industrial environments where safety-critical control is mandatory, including chemical processing refineries, nuclear power generation, and automated mining hoist mechanisms.
Technical Specifications
Model
6ES5942-7UF13 (CPU 942F)
Series
Simatic S5-115F
Module Type
Fail-Safe CPU
Operating Temperature
0 to 55 deg C
Storage Temperature
-40 to 70 deg C
Power Consumption
5 VDC (max 2.5 A)
Memory
Integrated RAM with EPROM/EEPROM slot
Installation Guidelines
Ensure the system power is completely disconnected before inserting or removing the CPU module from the S5-115F rack.
Verify that the backplane connectors are free of debris and oxidation to ensure reliable communication.
Maintain proper ventilation within the control cabinet to keep ambient temperatures within the specified 0 to 55 deg C range.
Use shielded cables for all I/O connections to minimize electromagnetic interference (EMI) in safety-critical loops.
Handle the module using ESD-safe practices to prevent damage to sensitive internal circuitry.
Ensure the module is fully seated and the locking mechanisms are engaged to prevent intermittent contact due to vibration.
FAQ
Is this module still in production?
No, the Siemens 6ES5942-7UF13 was discontinued by the manufacturer on January 11, 1994. It is recommended to maintain on-site spares to ensure the continued operation of existing S5-115F safety systems.
What is the primary function of the CPU 942F?
The CPU 942F serves as the central controller for the S5-115F system, specifically managing fail-safe logic and monitoring for hardware discrepancies or fault conditions to trigger a safe system shutdown.
