Product category:
Machine Safety Monitoring and Control
News Release from: Pilz Automation Technology | Subject: PNOZsigma
Edited by the Engineeringtalk Editorial
Team on 13 February 2008
Slimline safety relays add more contacts
Latest additions offer the potential for savings in cost and space compared with traditional safety relays.
The latest two additions to the Pilz PNOZsigma range of slimline safety relays enable the number of contacts to be expanded considerably, thereby offering the potential for savings in cost and space compared with traditional safety relays The first of these modules, the PNOZ s7.1, features three normally open safety contacts
This article was originally published on Engineeringtalk on 18 Oct 2007 at 8.00am (UK)
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A small number of PNOZsigma relays are replacing a very wide range of Classic relays, which will significantly simplify ordering and stockholding for customers.
Modules expand safety systems
Pilz Automation Technology expansion modules can be used to implement cascaded safety-related control systems using PNOZsigma relays.
It is connected - by means of a simple plug - to a PNOZsigma base unit safety relay type PNOZ s1, s2, s3, s4, s5, s6 or s6.1.
In addition, the PNOZ s7.1 incorporates a separate feedback loop that enables the 17.5mm wide module to be used as a stand-alone safety relay.
When a PNOZ s7.1 is used either as a stand-alone unit or with a PNOZsigma base unit, further expansion is possible by connecting a maximum of ten PNOZ s7.2 modules, each having four normally open safety contacts and one normally closed auxiliary contact.
Alternatively, a PNOZ s7.2 can be connected to a base unit as a single expansion module.
As with the PNOZ s7.1, the PNOZ s7.2 measures 17.5mm wide.
For applications requiring an even greater number of contacts, multiple PNOZ s7.1 modules can be used, each with a maximum of ten PNOZ s7.2 modules.
The only additional requirement is that a 24V supply must be provided for each PNOZ s7.1 module.
Although there is theoretically no limit to the number of PNOZ s7.1 expansion modules that can be used, each one adds 20ms to the 50ms reaction time of the base unit.
Care must therefore be taken to ensure the total reaction time remains acceptable.
Industries where the PNOZ s7.1 and PNOZ s7.2 modules are expected to prove particularly useful are automotive and paper.
However, they are equally suitable for other industries where ten contacts or more are required.
The PNOZ s7.1 and PNOZ s7.2 expansion modules will be available from the end of February 2008 priced at approximately GBP 75 and GBP 82, respectively.
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