The multifunctional safety relay modules in the PROTECT SRB-E series can cover a wide range of application profiles in eight available variants. They are suitable for monitoring all common electromechanical and electronic safety switches and solenoid interlocks as well as safety sensors and optoelectronic protective devices. The relay modules evaluate safe signals, such as those from positive opening position switches, various safety sensors and E-STOP/EMERGENCY STOP command devices. Signals from magnetic safety switches and optoelectronic protective devices (AOPDs) such as light barriers and light grids are also analysed by the safety relays. They can also be used in applications up to SIL 3 in accordance with EN 62061/IEC 61508 and category 4/PL e in accordance with 13849-1.
ADVANTAGES OF THE MULTIFUNCTIONAL SAFETY RELAY MODULES
A major advantage of the SRB-E series is its multifunctionality: each variant can replace several dozen existing SRB modules. Each module can be configured for up to eleven different applications. This process is carried out via an easy-to-use control element. The safety relay enables the monitoring of all common safety sensors and electromechanical protective devices. It also makes it much easier for machine manufacturers to select the right module for their individual application. This is thanks to the reduced number of versions and the clear presentation of the eight variants and their respective functions.
STRUCTURE AND MODE OF OPERATION OF THE SAFETY RELAYS
The Schmersal Group's multifunctional safety relay modules are equipped with two rotary switches. These are used to set functions such as start/reset monitoring or to control the required drop-out delay time of the safety outputs. After commissioning, the transparent cover of the front panel can be secured with a standard seal. The PROTECT SRB-E series impresses with very short response times and signals detailed status and diagnostic messages via LED displays. The enclosures optimised by Schmersal are also compact and equipped with various practical functions and features, such as pluggable connection technology including coding. Further technical details are available in the extensive online catalogue.
The Schmersal Group offers a wide range of products in the field of safe signal evaluation. In addition to universal safety relay modules, which are suitable for immediate disconnection of the energy supply to a hazardous movement, special forms of module are also available. Safety relay modules with double acknowledgement guarantee that the operator is outside the hazardous zone before the machine controller can be switched on again. To do this, the operator first presses the reset button inside the system and then another which is outside the accessible system area. The SRB 100DR safety relay for double acknowledgement is suitable for applications up to PL e/Cat. 4 in accordance with EN ISO 13849-1 and up to SIL 3 in accordance with IEC 61508.
FEATURES OF THE SAFETY RELAY MODULES FOR DOUBLE ACKNOWLEDGEMENT
SRB 100DR relays are suitable for signal processing of floating outputs, such as command devices, and are equipped with a STOP category 0 safety contact. The enclosure is ventilated and made from plastic and glass-fibre reinforced thermoplastic. This allows the module to be used in ambient temperatures of between -25 and +60°C. The cable cross section is 0.25 to maximum 2.5 mm².
The latest edition of the SRB-EXi safety relay modules combines functional safety, reliable signal processing and safety release with the requirements of explosion protection. It monitors the connected sensors, E-Stop command devices, interlocking devices, reset buttons and safety sensors with the ignition protection type intrinsic safety ‘i’. The modules were designed on the basis of the ATEX guideline 94/9/EC as well as the European standards EN 60 079 ff. The EXi monitoring circuits are intrinsically safe and designed for category 2GD or 3G devices according to ATEX, IECEx and INMETRO. Accordingly, emergency stop command devices and safety door monitoring can be used in areas at risk of dust and gas explosions.
SRB-EXi safety relay modules for various ATEX categories
The sensors can be installed in zones 1/2 and 21/22, while the PROTECT SRB-EXi modules can be installed in a suitable control cabinet in gas Ex zone . The Schmersal product portfolio includes two versions of the safety relay: the SRB 101Exi module with one safety contact and the SRB 200Exi version with two safety contacts. Both versions are used for the signal processing of E-Stop command devices, interlocking devices and other machine safety components. The user can choose between an automatic reset function (type version 1A) or a reset with edge detection (1R) for both the SRB 101Exi and SRB 200Exi models.
SRB-EXi safety relay modules from the reliable partner for machine safety
In addition to the SRB-EXi safety relay modules, Schmersal's comprehensive product range also includes other PROTECT SRB series safety relay modules for the safe evaluation of switching signals. Emergency stop buttons, electromechanical position switches, safety switches and solenoid interlocks on sliding, hinged or removable guard doors can be used as the switching element. PROTECT SRB modules are also available for optoelectronic protective devices (AODPs).
Safety relay modules in various designs
In the field of safe signal processing, the Schmersal Group offers its customers a range of type-approved solutions with a variety of visualisation and diagnostic options. A distinction is made between universally applicable safety relay modules, which are used, for example, for the instantaneous disconnection of the energy supply to the hazardous movement (Stop 0 category according to EN 60204-1), and special safety modules, e.g. with double acknowledgement or differentiated switch-off behaviour. The Schmersal Group's extensive product portfolio also includes safety gate monitors for potentially explosive atmospheres. An overview:
Safety door monitors: SRB-EXi safety relay module
The explosion-proof SRB-EXi version of the Schmersal safety relay modules has IECEx and INMETRO approval. They are suitable for both the safe signal evaluation of emergency stop devices and safety door monitoring.
Stop 0 and Stop 0/1
The safety relay modules Stop 0 and Stop 0/1 are used for signal processing of interlocking devices, E-Stop command devices, as well as safety magnetic switches and non-potential-free signals, such as those from AOPDs. They are suitable for applications up to PL e/category 4 in accordance with EN ISO 13849-1 and SIL 3 in accordance with IEC 61508
SRB 100DR for double acknowledgement
These safety relay modules with double acknowledgement ensure that the operator is not in the danger area when the machine control system is reactivated. To do this, a reset button inside the system is pressed first, followed by another outside the accessible system area. The SRB 100DR series for double acknowledgement is suitable for applications up to PL e/Category 4 according to EN ISO 13849-1 and SIL 3 according to IEC 61508.
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