January 2011Operator Interfaces, Switches & Relays
The Allen-Bradley Guardmaster Minotaur MSR300 configurable safety relay system from Rockwell Automation offers expanded functionality through the MSR312P DeviceNet base module and the MSR338DP time delayed output modules.
The MSR300 family of configurable safety relays can handle complicated safety systems by allowing the user to connect multiple input or output modules to a single base unit. It offers the ability for logic configuration with multiple inputs and the control of multiple independent outputs. The system can control up to three independent groups of outputs and perform simple function block logic configurations through rotary switch settings. Users can mix and match modules to work with various input device types.
Retaining the configuration of the safety system, the MSR312P DeviceNet base module provides additional diagnostics for status information. If faults occur in the input or output strings, the base will detect these faults and safely initiate shutdown. This system is ideal for multizone applications using multiple inputs, delivering flexibility and optimising shutdown procedures.
A time-delayed output expansion module, the MSR338DP is available in three versions to allow time-delayed functionality to be used in the three independent zones the MSR300 series controls. Up to six output modules can be connected to one base unit allowing for timed-delay and instantaneous output modules to be used side by side. A mix-and-match approach of instantaneous and timed-delay outputs can aid in applications requiring the immediate stop of one zone and a delayed stop of another, which could be used to allow an inverter drive to stop under standard control before a safe stop is enforced.
The MSR300’s diagnostic capabilities reduce maintenance time by providing easy access to input, output and error status. A total of 20 inputs and 18 outputs grouped in three independent zones can be controlled.
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