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Galvanic Isolation

Created by: mazdak at: 11/18/2009 10:49 AM (4 Replies)

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11/18/2009 10:49 AM	Rate (0)
mazdak Posts: 64 Rating: (0)	Hi Friends Can anyone tell me what's the role of "Galvanic Isolation" in an Input module? (for example SM321: 6ES7321-1BH02-0AA0) And what's the difference between "Galvanic Isolation" and "Optical Isolation" Sincerely Mazdak
mazdak Posts: 64 Rating: (0)
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11/18/2009 2:26 PM	Rate (0)
SILOGIC Posts: 17 Rating: (0)	Hi Mazdak, Galvanic isolation is a way of isolating elctricaly inputs from functional parts of the module, so the signal is readed by the module, but it's protected against overvoltages or overcurrents from field. There is no electric current flowing directly from one section to the next. Information is still exchanged between the sections by other means, however, such as optical, Optical isolation is a way of Galvanic Isolation, like optocouplers (when you have current in the transmitter, its transmit a light beam wich excites a receiver, allowing the current to pass trough it, so there is no current pass between transmiter and receiver). Best regards Patricio Novotny SILOGIC Ingeniería y Automatización Bolívar 284 Piso A - (B1704BKF) Ramos Mejía - Bs. As. - Argentina tel. 54 11 4656 4349 fax. 54 11 4464 5844 cel. 54 11 15 6058 0699 www.silogic.com.ar
SILOGIC Posts: 17 Rating: (0)
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11/18/2009 3:47 PM	Rate (0)
mazdak Posts: 64 Rating: (0)	Dear SILOG Suppose a situation that we have a short circuit in field side. What does happen using a Optically isolated DO module? Short circuit current is prevented to go inside the module, But LEDs of optocoupler will be affected by short circuit current and will be defected. So the entire module will be unusable.
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11/22/2009 2:08 PM	Rate (0)
Ubv Posts: 2 Rating: (0)	Dear Mazdak, Galvanic Isolation in this module having three functions they are the following; 1) Isolation of Signals 2) Conversion of Signals 3) Duplication of Signals The difference between galvanic isolation & optical isolation is the following; Transformer(induction) based isolation is the principle of galvanicisolation & Light(optical) based isolation is the principle of Optical isolation. GoooddayY!
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11/23/2009 2:25 PM	Rate (0)
SILOGIC Posts: 17 Rating: (0)	Hi Mazdak, You should use fuses in each digital output to protect it agains't short circuits. Best regards, Best regards Patricio Novotny SILOGIC Ingeniería y Automatización Bolívar 284 Piso A - (B1704BKF) Ramos Mejía - Bs. As. - Argentina tel. 54 11 4656 4349 fax. 54 11 4464 5844 cel. 54 11 15 6058 0699 www.silogic.com.ar
SILOGIC Posts: 17 Rating: (0)
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