Monday 7 January 2013

Analog to Digital Converter


An analog-to-digital converter (commonly abbreviated as ADC, A/D or A to D) is a device which converts continuous signals to discrete digital numbers. In general, an ADC is an electronic device basically employed for transforming an input analog voltage or current in to a digital number proportional to the magnitude of the voltage or current.
An analog signal is continuous in time and it is required to convert this to a flow of digital values. For that reason it is essential to define the rate at which new digital values are sampled from the analog signal. The rate of new values is called the sampling rate or sampling frequency of the converter.

Analog to Digital Converter - Continued

Thursday 3 January 2013

RSLinx Diagnostic Tools


RSLinx includes a wealth of diagnostic information to assist us in analyzing our system. Whether it's trouble-shooting a communication problem or analyzing network throughput, RSLinx provides the needed information. Diagnostics fall into following three major categories:
  1. Networks: Diagnostic counters track server information such as messages sent, messages received, messages acknowledged, communication errors, and timeouts. Performance counters give throughput in terms of packets/second.
  2. Station: Diagnostic counters indicate information for a selected station such as messages sent and received, message retries, and packet errors.
  3. OPC/DDE: Multiple dialogs for DDE clients, OPC Groups, Optimized Packets, and OPC/ DDE server connections display diagnostic information specific to the category. A Communication event log displays information specific to an OPC/DDE transaction.