Application Example - Advantech ADAM 4000 Series User Manual

Installation Guideline

2.5 Application Example

ADAM-4011 alarm functions may be used to build a simple ON-OFF
controller application that will operate without host intervention.
When the proper alarm settings have been stored in ADAM's EEPROM it
would be able to function as a stand alone device where no communication
lines are required.
A simple controller application would use the momentary alarm output to
control the process. Lets assume we are controlling a heating process. The
input of the Analog Input will be the process' temperature and its output
determine whether the heater is turned on or turned off. (See Figure 2-5)
In order to maintain a steady temperature set the LO limit of the alarm
function to desired setpoint and configure the alarm mode as Momentary.
Utilize the LO alarm output (DO0/LO) to control the SSR relay that
controls the heater.
If the module measures a temperature that undergoes the LO alarm setting
it will turn the LO alarm high which causes the heater to be switched on.
When a temperature is measured that exceeds the LO alarm setting the LO
alarm is set to low and the heater is turned off. In this application the HI
alarm output is still available to activate an alarm or generate an emergen-
cy shut-down if the temperature gets out of control.
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