Allen-Bradley Guardmaster safety relays

The new line of Allen-Bradley Guardmaster safety relays features single-wire communication capability that helps eliminate the need for dual-channel connection between relays.

The line includes basic units capable of supporting a range of safety devices in various applications, such as single and multizone configurations. It can help machine builders and end users simplify safety relay selection and reduce component inventory and life cycle costs. Users can expand and cascade safety functions up to a SIL 3 rating using a single wire to connect devices. This leads to reduction in installation time and effort. In addition, AND/OR logic can be set via a rotary switch on the front of the relay, yielding a variety of configurations including regional and global e-stop architectures.

It also features dual-input modules, providing users with twice the functionality of a standard relay in 22.5 mm housing. A single TUV-approved rotary switch with internal redundancy eliminates the need for double switches, helping to speed configuration while addressing multiple functions such as reset modes and time delays.

The range includes: Guardmaster DI/DIS that consolidates functionality of two safety relays into a single 22.5 mm housing; Guardmaster SI, with two NO outputs and one PNP auxiliary output, which is suitable for simple safety applications using one dual or single-channel safety device; Guardmaster CI which has the same functionality as SI but the terminals on the CI are arranged in a similar layout to legacy Guardmaster MSR safety relays and other brands of safety relays; and Guardmaster EM/EMD. The safety relay line is designed to meet new functional safety standards such as EN ISO 13849-1 or IEC/EN 62061.