METHODS FOR CONSOLIDATING MODULE TYPES FOR INDUSTRIAL CONTROL SYSTEMS

摘要

A programmable discrete input module is described. In one or more implementations, the programmable discrete input module comprises a pulse width modulation module configured to generate a pulse width modulated signal based upon an input signal and a pulse width demodulation module configured to generate a demodulated pulse width signal. An isolator is configured to isolate the pulse width modulation module and the pulse width demodulation module and to generate isolated modulated pulse width signal based upon the pulse width modulated signal for the pulse width demodulation module to generate the demodulated pulse width signal. The programmable discrete input module also includes a first comparator and a second comparator for comparing the demodulated pulse width signal with a respective programmable reference and a digital filter configured to filter a comparison signal output by the first comparator or the second comparator to generate a discrete input signal.

主权项

1. A programmable discrete input module comprising:
a pulse width modulation module configured to generate a pulse width modulated signal based upon an input signal; a pulse width demodulation module, the pulse width demodulation module configured to generate a demodulated pulse width signal; an isolator configured to at least substantially isolate the pulse width modulation module and the pulse width demodulation module, the isolator configured to generate an isolated modulated pulse width signal based upon the a pulse width modulated signal for the pulse width demodulation module to generate the demodulated pulse width signal; a first comparator communicatively coupled to the pulse width demodulation module, the first comparator configured to compare the demodulated pulse width signal with a first programmable reference, the first comparator configured to output a first comparator output signal based upon the comparison; a second comparator communicatively coupled to the pulse width demodulation module, the second comparator configured to compare the demodulated pulse width signal with a second programmable reference, the second comparator configured to output a second comparator output signal based upon the comparison; and a digital filter communicatively coupled to the first comparator and the second comparator, the digital filter configured to digitally filter at least one of the first comparator output signal or the second comparator output signal to generate a discrete input signal.