ABB SD802F 3BDH000012R1 Communication gateway module

REFRESHING THE WATCHDOG If the watchdog timer is enabled, software must periodically refresh the watchdog timer at a rate faster than the timer is set to expire (1.0 sec minimum). Outputting a 5Ah to the Watchdog Timer Hold-Off Register at 1D1h resets the watchdog time-out period, see page 49 for additional information. There is no provision for selecting a different timeout period using software. The following code example refreshes the watchdog: MOV DX,1D1H

SOFTWARE CONFIGURATION The EPIC-2 can be configured to issue an interrupt when the analog-to-digital converter has completed a conversion. IRQ selection is done in CMOS Setup.

CPU Temperature Monitor 

A thermometer circuit constantly monitors the die temperature of the CPU. This circuit can be used to detect over-temperature conditions which can result from fan or heat sink failure or excessive ambient temperatures. The CMOS setup is used to set the temperature detection threshold. A status bit in the Special Control Register bit D5 if I/O port 1D0h, can be read to determine if the die temperature is above the threshold. Contact the factory for information on clearing the status bit or reading and writing to the thermometer circuit. See page 48 for additional information.

Analog Input 

The EPIC-2 analog input uses a 12-bit A/D converter that accepts up to eight single-ended input signals. The converter features fast 75 KSPS samples per seconds (KSPS) conversion time, with input range of 0 to +4.095V with 4096 steps at 0.001V each. A/D input impedance is 33 pF, so it expects low impedance source. Maximum input voltage is 4.395V (4.095V + 0.300V) and minimum input voltage -0.300V. Warning! Application of analog voltages greater than +4.395V can physically damage the converter. Note: The A/D converter is not designed to accept high impedance signals. It requires low source impedance signals, in the range of 1500 ohms, to avoid data corruption from transient signals.

Application industry

The products can be used in the following industries: power plant, paper making, steel, mining, rubber, water supply, cement, chemical industry, glass, printing

Textile, machinery, plastics, coatings, medicine, hospitals, food, hotels, scientific research institutions

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