ProControl User’s Manual v2.2X
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Analog Outputs
Analog outputs are typically used in process control schemes where a controlled
piece of equipment can accept a signal which is variable over a range. This output is
expressed as a percentage (0 - 100%) and is used to control pump speeds, chemical
dosing rates, etc., instead of conventional on/off operation. The equipment that the
ProControl sends the analog output to must accept a 4 - 20 mA signal. Often, an
analog output is used in conjunction with an analog input such as a pH transmitter
to form a control scheme known as feedback control. In essence, the input and
output will work together to maintain a user set input level. This concept is
described further in the next section under Analog Output Processes.
Tagnames
Each input and output is given a descriptive Tagname by the user that uniquely
identifies it to the system operator. For instance, a digital input could be called
" TANKHI# , an analog input could be called " AIRFLO# and a digital output could
be called " PUMP_1# . This tagname is used by the local LCD display, the email/fax
reports and by the ProView software. The analog inputs are also given a Units
Tagname w
hich identifies the unit of measure associated with the input sensor.
Each tagname can be up to six characters long and each units tagname can be up to
three characters long (" PSI# , for instance). The tagnames can include the uppercase
letters A-Z, the numbers 0-9, a blank space, and the underscore (_) character.
1.3 Control
Basics
The status of all inputs or outputs can easily be monitored both locally and remotely.
What gives the Series 2
plus
its real power, however, is the ability to automatically
initiate actions based on the status of the inputs and your pre-programmed
instructions (this is often called Process Control). These actions can include
switching certain outputs, sending an email report, sending an text message, shutting
down the entire system or sounding the local alarm. Process control functions are
programmed into your ProControl by EOS Research or one of our technology
partners according to your specifications.
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