Advantech RS-485 user manual Diagnosis, Way Isolation and Watchdog Timer, Flexible Alarm Setting

Chapter 3

Diagnosis

There are 4 LEDs (indicated as PWR, RUN, TX and RX) to provide visual information on the general operation of the ADAM-5000 system. The LEDs also indicate the error status when the ADAM-5000 system performs the self test. Besides the LED indica- tors, the system also offers software diagnosis via the RS-232 port. For details, refer to Chapter 7.

3-Way Isolation and Watchdog Timer

Electrical noise can enter a system in many different ways. It may enter through an I/O module, a power supply connection or the communica- tion ground connection. The ADAM-5000 system provides isolation for I/O modules (3000 VDC), communication connection (2500 VDC) and communication power connection (3000 VDC). The 3-way isolation design prevents ground loops and reduces the effect of electrical noise to the system. It also offers better surge protection to prevent dangerous voltages or spikes from harming your system. The system also provides a Watchdog timer to monitor the microprocessor. It will automatically reset the microprocessor in ADAM-5000 system if the system fails.

Remote Software Configuration and Calibration

The ADAM-5000 system merely issues a command from the host computer, you can change an analog input module to accept several ranges of voltage input, current input, thermocouple input or RTD input. With the exception of system node address, all the parameters including speed, parity, HI and LO alarm, and calibration parameters setting may be set remotely. Remote configuration can be done by using either the provided menu-based software or the command set's configuration and calibration commands. By storing configuration and calibration parameters in a nonvolatile EEPROM, the systems are able to retain these parameters in case of power failure.

Flexible Alarm Setting

The ADAM-5000 system provides a flexible alarm setting method via an utility software (ADAM.EXE) between analog input modules and digital output modules. The user may configure a point of any digital output module plugged into any slot as the High alarm or Low alarm

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