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Plug-in Modules Expand PNOZsigma Safety Relay Contacts

Supplier: Pilz Safe Automation

For applications requiring ten or more safety contacts, Pilz is launching two new expansion modules for use with its slimline PNOZsigma relays


Pilz Automation Technology is introducing two new modules in the PNOZsigma range of slimline safety relays to enable the number of contacts to be expanded considerably, thereby offering the potential for considerable 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. 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 standalone safety relay.

When a PNOZ s7.1 is used either as a standalone 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.

Please contact Pilz to request more information about the PNOZ s7.1 and PNOZ s7.2 expansion modules, which will be available from the end of February 2008.