Product category:
Machine Safety Components
News Release from: Siemens Automation and Drives | Subject: 3SF7844 light curtains
Edited by the Engineeringtalk Editorial
Team on 11 May 2007
Light curtains upgraded
An integrated Profisafe interface unit allows 3SF7844 light curtains to provide fail-safe communication to presses, stamping machines, coilers, cutting machines and commissioning stations.
Siemens Automation and Drives (AandD) has now fitted the 3SF7844 light curtains from the Simatic-FS420I family with an integrated Profisafe interface unit This enables fail-safe communication in applications such as presses, stamping machines, coilers, cutting machines and commissioning stations
This article was originally published on Engineeringtalk on 6 Mar 2001 at 8.00am (UK)
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The unit also protects access and supply areas.
The Profisafe interface enables comprehensive diagnostics via Profibus and automation parameter matching.
With a data transmission rate of up to 12Mbit/s, secure cyclical as well as acyclical data traffic via Profibus DP is supported.
This means that fast safety-relevant real-time data, as well as extensive diagnostics data, can be exchanged with the programmable logic controller, whilst the self-parameterisation function shortens the downtimes when a device has to be replaced.
There are versions with resolutions of 14, 30 and 50mm and protection field heights of 150 to 3000mm.
The test signal, start/restart inhibit, contactor monitoring, blanking, muting and cycle control functions have already been integrated.
The functions are adapted individually, either by means of six internal switches or via the optical interface of the receiver.
Integration of the system in the automation solution is carried out by means of Step 7 function blocks.
With SIL 3 (safety integrity level) and Category 4 in accordance with EN954-1, Profisafe meets the high safety requirements for the process and manufacturing industry.
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