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Autore principale:	Juan F. Monsalve-Posada
Natura:	Artículo científico
Lingua:	es
Pubblicazione:	Instituto Tecnológico Metropolitano 2015
Soggetti:	Ingeniería IWLAN control tiempo real Industrial Ethernet ambientes industriales
Accesso online:	https://www.redalyc.org/articulo.oa?id=344234336008
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Desempeño de redes inalámbricas y redes industriales inalámbricas en procesos de control en tiempo real bajo ambientes industriales Juan F. Monsalve-Posada Alexander Arias-Londoño Juan G. Mejía-Arango Ingeniería IWLAN control tiempo real Industrial Ethernet ambientes industriales El uso creciente de las redes Ethernet en el piso de la pirámide de automatización hahecho que muchas compañías desarrollen dispositivos para operar bajo losrequerimientos característicos de este nivel, en la actualidad denominada red IndustrialEthernet.Anivel industrial se encuentra en el mercado variedad de sensores yactuadores que incorporan esta tecnología, muchos de estos equipos se venden a muy altocosto, por eso en este artículo se evaluó el desempeño de dos redes inalámbricas, una condispositivos del Ethernet convencional, y otra con dispositivos de Industrial Ethernetvariando cuatro parámetros que son: distancia, número de bytes, relación señala ruido yla tasa de error de paquetes, midiendo los retardos y comparando con métricasestadísticas los resultados, para ello se usaron gráficas Box Plot. Al final, se concluye quebajo los parámetros y condiciones evaluados, las redes inalámbricas puedenservir comosistema de comunicación en aplicaciones de control con retardos permisibles de hasta 50ms, además, los resultados demuestran un mejor desempeño de las redes IndustrialEthernet con respecto a las convencionales, con diferencias en los RTT demilisegundos.Por lo tanto, se recomienda establecer qué riesgo representa para el proceso a controlarestos retardos y así determinar si los equipos convencionalesaplican, ya que bajo ciertascaracterísticas,como condiciones de humedad y temperatura,pueden operaradecuadamente durante un tiempo considerable y a un menor costo que los dispositivosde Industrial Ethernet. 2015 artículo científico 0123-7799 https://www.redalyc.org/articulo.oa?id=344234336008 es http://www.redalyc.org/revista.oa?id=3442 TecnoLógicas application/pdf Instituto Tecnológico Metropolitano TecnoLógicas (Colombia) Num.34 Vol.18

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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