Product category:
Industrial networking and communications
News Release from: R Stahl | Subject: ISpac 9186 type isolating repeaters
Edited by the Manufacturingtalk Editorial
Team on 09 April 2008
Stahl fibre optic lines bridge longer
distances
Intrinsically safe fiber optic communicationby R Stahl bridges middle distances in Profibus DP networks providing reliable Ex-signal transfer through 2km fibre optic lines or rings.
R Stahl said that fibre optic lines can bridge more than ten times the distance of copper cables, so users can transfer signals with the same bandwidth from Profibus DP field devices up to 2km or more Intrinsically safe ISpac 9186 type isolating repeaters allow for communication between hazardous and safe areas
This article was originally published on Manufacturingtalk on 18 Apr 2003 at 8.00am (UK)
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The isolating repeaters can also be used to implement ring structures, ensuring high availability through the redundant route.
Problems such as insufficient potential equalization, which can occur in Profibus cables with screen grounding, are ruled out.
The light waves are not affected by electromagnetic interference from devices within and outside of the network.
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The only restrictions users face, said R Stahl, are installation requirements, such as maximum bending radius, acceptable strain and compression, and, if required, the necessary explosion protection against light as an ignition source.
The protection type 'optical intrinsic safety' (Ex op is) is particularly suited for that purpose.
It not only ensures a safe limitation of optical energy per unit area, but also allows for very easy installation.
ISpac 9186 type isolating repeaters feature Ex i.
Ex op is protected data transmission interfaces.
Therefore, the electric RS 485 plug and the fibre optic connection can be connected and disconnected at any time under load (without switching off the laser diode).
* Novel diagnosis function - additionally, the easy-to-use isolating repeaters feature a novel diagnosis function which constantly analyses the level of the received optical signal, displaying it via an LED bar at the unit's front side.
The function allows users to determine the quality of the received signal at one glance, without using measuring equipment, said R Stahl to manufacturingtalk.
If the receive level reaches a critical area, the isolating repeater additionally reports that status vial a potential-free contact.
Thereby, impending failures can be displayed for maintenance staff in due time.
Apart from models suitable for zone 1, R Stahl also provides isolating repeaters for zone 2 and safe areas.
The units are designed as system components - as such, they complement R Stahl's other products for connecting field devices.
Supporting a large number of fieldbuses (Profibus DP, Modbus, HART RS-485 and R Stahl ServiceBus), they especially enhance the flexibility and applicability of the IS1 remote I/O system.
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