UM344-2

INSTALLATION

ŸIndividual miscellaneous hardware must meet the following requirements:

Ÿ Capacitance to Ground

50 pF maximum

Ÿ Resistance to Ground

1 MΩ minimum

Ÿ Impedance if Series Connected

Less than 10Ω

Ÿ Impedance if Parallel Connected

Greater than 50kΩ.

ŸThe maximum number of miscellaneous devices per Network is 16. The combined electrical characteristics may not exceed the following:

Ÿ Maximum capacitance to ground

................ 800 pF

Ÿ Minimum resistance to ground

62.5kΩ

Ÿ Maximum series impedance

160Ω

Ÿ Minimum parallel impedance

3125Ω

4.3.9 Determine Sensor Cable Requirements

If the Transmitter is mounted remotely from the sensor, the wire characteristics of the extension cable between the sensor and Transmitter will be different for thermocouple inputs than for RTD, ohm, or millivolt type inputs.

A.Thermocouple Sensor-to-Transmitter Extension Cable:

1)Select extension grade or thermocouple grade wire of the same calibration as the thermocouple: calibrations are T, J, E, K, R, S, N, B.

THERMOCOUPLE GRADE: Wire is made from same materials as thermocouple and subject to same limits of error as thermocouple.

EXTENSION GRADE: Noble and refractory thermocouple extension grade wire is made from inexpensive proprietary alloys that simulate the thermoelectric behavior of the actual thermocouple element over a limited range of temperatures.

Base metal (T, J, K, E) thermocouple extension grade wire is made from the same materials as thermocouple wire; however, its use is restricted to a lower range of temperatures.

For extension grade wire, the ambient temperature at the thermocouple head connection point may not exceed the temperature limits of the extension wire.

2)Cable Recommendation: FEP insulated and jacketed, twisted and shielded. Wire size should be 16 to 20 AWG.

September 1995

4-13

Page 47
Image 47
Siemens UM344-2 user manual Determine Sensor Cable Requirements

UM344-2 specifications

The Siemens UM344-2 is a cutting-edge industrial controller designed to meet the demands of modern automation and control systems. This powerful device is specifically developed for use in various applications, including manufacturing, process control, and machinery integration. The UM344-2 stands out for its versatility and robust performance in harsh industrial environments.

One of the main features of the Siemens UM344-2 is its high processing speed, which allows for real-time data processing and decision-making. The controller utilizes advanced microprocessor technology, ensuring quick response times and efficient operation. Its architecture supports multitasking, enabling it to manage multiple processes simultaneously without compromising performance.

The UM344-2 features a modular design, which provides flexibility in configuration and scalability. Users can easily add or remove modules to tailor the system to specific application requirements. This adaptability is beneficial for businesses that need to scale their operations or adjust to changing production demands. The controller is compatible with a variety of I/O modules, allowing for seamless integration with other equipment and systems.

In terms of connectivity, the Siemens UM344-2 supports various communication protocols, including Profibus, Profinet, and Ethernet. This versatility ensures smooth data exchange between the controller and other devices in the automation ecosystem, facilitating comprehensive monitoring and control. The inclusion of these communication standards enhances interoperability and allows for the integration of legacy systems with newer technology.

The Siemens UM344-2 is equipped with advanced diagnostic tools, which enable users to monitor system performance and detect potential issues in real-time. This feature reduces downtime and maintenance costs by allowing for proactive management of the system. The controller also supports remote access capabilities, enabling technicians to troubleshoot and configure systems from off-site locations.

Safety is a critical consideration in industrial environments, and the UM344-2 is designed with this in mind. It incorporates safety-certified features, ensuring compliance with international safety standards. Users can implement safety functions directly within the controller, streamlining system design and reducing the need for external safety components.

Overall, the Siemens UM344-2 exemplifies the fusion of technology and practical application, making it an essential component for businesses looking to enhance their automation processes. With its high performance, flexibility, and focus on safety, the UM344-2 is a reliable choice for industries aiming for efficiency and innovation in their operations.