Next-generation Safety Relays
We have introduced the next generation of our Allen-Bradley Guardmaster safety relays, comprising just six products (and six catalogue numbers), which may fulfil the majority of the requirements needed for safety related applications.
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This doesn’t mean the existing portfolio will become obsolete, just that for customers who wish to simplify their inventory and usage, they will have a choice to select the smaller family of next-generation, newer technology safety relays.
With the ranges ability to be function configured for simple logic tasks and having universal inputs, this much smaller family of relays can support a broad range of safety devices for a variety of applications. The universal input feature allows devices such as safety-interlock switches, emergency-stop switches, pressure-sensitive mats and OSSD devices such as safety light curtains to use the same set of terminals. This removes the requirement for a specific safety relay for a specific type of input device and fosters simplified system design, inventory management and maintenance in the lifecycle of a system.
Simple logic tasks can also be achieved. The DI and DIS units both have two dual-channel input circuits within a 22.5mm housing. These inputs can be set for AND/OR logic within the safety relay itself, or from relay to relay by the use of a single-wire. This simple single-wire link between the units uses transistor technology and offers monitoring via dynamic signals. This removes the need for dual-channel connection between the relays and offers SIL 3, PLe safety rating.
With this logic functionality, applications can be configured to offer flexible AND/OR functional control. For example: if interlocked guard door 1 and guard door 2 are closed, then interlocked guard door 3 can be opened without stopping the machine. Other options can be configured for requirements such as regional and global e-stop functions.
The following safety relays are available now from the Central European Distribution Centre (CEDC):
• Safety relay with two dual-channel inputs and two solid-state outputs
• Safety relay with two dual-channel inputs and two relay outputs
• Safety relay output expansion module with four instantaneous relay outputs
• Safety relay with a single dual-channel input and two relay outputs
• Safety relay with a single dual-channel input and three relay outputs
• Safety relay output expansion module with four delayed relay outputs via adjustable rotary switch
With this family of next generation Guardmaster safety relays, we are confident that our customers will welcome a smaller family with increased functionality to help them with their machine safety requirements.
For more information, please e-mail us at: info_update@ra.rockwell.com ref: 'LSR'.
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