Monday, 11 August 2014
Thursday, 31 July 2014
2) Current 4-20ma from transmitter given directly to AI module .
3) Current with Hart Signal given to AI module which supports to HART signal. Digital information superimposed on Analog signal.
Wednesday, 30 July 2014
Status of solenoid coil monitored continuously during De-energized condition. Very low Constant current injected for detecting open or short condition of Dc solenoid. Window comaparator for checking healthy status of solenoid. Energized condition is overriding condition and ignore action taken by detection circuit during this period. Healthy signal relay gives free potential contact for logical configuration of status.
Universal Analog Input Isolator Module for 4-20mA Input With 2 or 4 Wire Or 1-5v Output Voltage Configurable
1) 2 wire mode input : +24v dc power given by analog input module and return path is connected to load resistor inside Analog input module.
2) 4 wire mode input : Transmitter powered externally. 4-20ma current given to current input AI module.
3) 1-5v mode input : 4-20ma current from transmitter given to load resistor 250 ohms on field Interfacing Module. Output 1-5v given to voltage input AI module.