Foundation Fieldbus (FF) supports two communication technologies: H1, a low-speed bus operating at 31.25 kbit/s for field instruments, and High-Speed Ethernet (HSE), operating at 100 Mbit/s for backbone networks. Physical layer testing for Foundation Fieldbus field devices primarily focuses on the H1 bus. FF H1 uses Manchester encoding, which carries clock synchronization information along with […]

WirelessHART is a wireless communication protocol designed for process automation applications. It adds wireless communication capabilities to HART technology while maintaining compatibility with HART devices, commands and tools. WirelessHART uses a mesh network architecture in which network devices can route messages for other devices. For engineers working with process instrumentation, WirelessHART provides a way to […]

PROFIBUS DP devices are used in industrial automation for communication between PROFIBUS masters and distributed field devices. When a device manufacturer develops an intelligent PROFIBUS DP slave, the communication controller is an important part of the device architecture. A PROFIBUS DP ASIC can provide the hardware and communication functions required for implementing a PROFIBUS DP […]

As industrial automation systems become more connected, device integration has become an important part of engineering and commissioning. Field devices need to exchange information with host systems, engineering tools, and control platforms, and different integration technologies are used for different protocols and system environments. Four technologies frequently encountered in industrial automation are EDD, DTM, GSD, […]

What Is a HART Temperature Transmitter and How Does It Work? Most process plants still run on 4-20mA loops, and replacing that wiring wholesale isn’t realistic. A HART temperature transmitter works with that existing wiring instead of against it: it keeps the 4-20mA analog signal for the control system and adds a digital layer on […]

What Is an RTD Temperature Transmitter and How Does It Work? Temperature is one of the parameters that most directly affects safety and yield in oil and gas, chemical, power generation and pharmaceutical plants. Most plants don’t wire a bare RTD sensor straight into a PLC or DCS. They put a transmitter between the sensor […]

Many process plants continue operating reliable electric actuators installed years ago with Modbus RTU communication. The challenge appears when modern DCS, PLC, or asset management systems require HART communication for device diagnostics, configuration, and predictive maintenance. Replacing existing actuators with native HART models can solve the communication gap, but it often introduces high equipment costs, […]

HART 7.9 is the latest revision of the HART communication protocol from FieldComm Group. It adds SafeHART, a data path for safety-related digital communication, and Digital Write Protect, a remote lock against unauthorized configuration changes. Both are now active on production units of the Microcyber NCS-TT305 temperature transmitter, alongside the device’s existing 4-20mA output and […]

Un bucle de 4-20mA solo transporta un número. HART fue creado para cambiar eso sin tocar el cableado. Highway Addressable Remote Transducer — HART — pone una señal digital encima de los mismos dos cables que ya transportan la variable de proceso analógica. El bucle sigue funcionando exactamente como lo hacía antes; la capa digital viaja junto a […]

Un transmisor de temperatura se encuentra entre un sensor y un controlador. Toma la señal cruda de una RTD o un termopar y la convierte en algo que un PLC o DCS realmente pueda usar, generalmente una corriente de 4-20 mA, a veces una señal digital que viaja sobre esa corriente. Sin él, el controlador necesitaría interpretar […]

Muchos transmisores de temperatura se anuncian como “compatibles con HART”, pero la compatibilidad por sí sola no garantiza que un dispositivo haya sido probado según la especificación completa del protocolo HART. Para los integradores de sistemas y los ingenieros de planta, existe una distinción importante entre admitir la comunicación HART y estar registrado oficialmente por FieldComm Group. Lo que realmente prueba el registro HART El HART […]

Los instrumentos de campo rara vez fallan debido a sensores defectuosos o electrónica degradada. En plantas químicas, instalaciones costeras y plataformas marinas, el punto de falla más común es la carcasa misma. Una picadura en la carcasa se convierte en una vía de entrada de humedad. La humedad llega a los terminales. Los terminales se corroen. La señal se desvía o el dispositivo se desconecta por completo. Los fabricantes suelen abordar esto […]