Key Features of Modular Event Sequence Recorder System

• Flexible, modular system comprising of remote terminal Units [RTU] each catering to 128 Digital Input points.
• The system is expandable to 2048 points using up to 16 RTUs in one rack.
• Each RTU has 8 plug-in modules having Termination Signal Conditioning, Isolation and DC excitation for 16 Digital Inputs.
• Operating under a dedicated Microprocessor the RTU Logs sequence of an event [Digital Input status changes] with a resolution of 1.0 milli second derived from an internal or external [switch selectable] 1.000 KHz Oscillator Signal.
• Event synchronization in larger system involving more than one RTU [in one rack] is achieved using “First To Assert Broadcast” logic techniques to signal start of an “Event”.
• The external common clock can be derived from any one of the RTUs and is settable from 1ms to 1.0 sec in predefined steps.
• Each RTU is configured with a DIP switch selectable address [0-15], for RS-485 multi-drop serial communication, to receive commands and to transfer status/ event data to any supervisory control Data Acquisition system [SCADA].
• Each RTU has its own program and Data Memory and a Real Time Clock Calendar.
• Data Memory of the RTU is able to store more than 100 Event Records.
• Each RTU has its own Real Time Clock and Calendar IC, which can be configured and synchronized from the Host PC.
• Besides enunciation on the PC screen, each DI module will provide LED Status indication, locally on the RTU Sub Rack Rear Panel.
• RTU is constructed in a standard 19”, 3U [138 mm Height], 250 mm [depth] Sub Rack unit with its own power conditioning operating under external 24V DC Supply [Not included in the scope of supply].
• All inputs are driven by 24V DC isolated Supply with 2.0mA nominal load.
• Inputs will be filtered by a 3.0mS settling Analog filter, an Opto Isolator [Isolation 1500V DC], a +15V logic Schmitt Trigger circuit and a logic level translator for TTL processing.
• The RTUs communicate between them through optically isolated current loop, logic signals to perform function like signalling start of “Event” and “Master Reset” etc.
• Event Records are stored in the Microprocessor’s non-volatile memory and are retrieved by the supervisory computer under a software package developed by Core Technologies.
• The serial communication command set includes Clock Synchronization, Status log on demand or periodic log at predefined intervals, clear data and setup operation.
• Raw data files from different RTUs are merged and arranged to generate a composite Event Sequence Record.
• The software provides for archival and retrieval of old data from the hard disk using dedicated screens operating under Windows 98/2000/ME