FX15 Controller Technical Bulletin
37
Using Analog Inputs as Digital Inputs
In case the user needs more than the 8 digital inputs available, the FX15
allows you to use an analog input as digital input.
Figure 37: Digital Input Connection Diagram
FX15
The Analog Input needs to be properly configured in FX Tools to read
the digital input.
Analog Outputs
The FX15 provides up to four, 0-10 VDC, 2A maximum, opto-isolated
analog outputs. The Analog Output objects provide the interface
between the four hardware Analog Output channels and the control
application. See I/O Technical Details at page 54 for the complete
FX15 I/O table.
The analog outputs can be configured for direct or reverse acting in the
application software.
The output signal can be limited by high limit (MaxOutput) and low
limit (MinOutput) values.
Powering and Connecting the Analog Outputs
The analog outputs can be separately powered, through Terminals 79
and 80, in order to ensure microprocessor isolation from the controller
power supply (see Figure 39).
The FX15 analog outputs are commonly used to drive proportional
devices and can be connected to all the Johnson Controls Proportional
Valve Actuators.
The following figure represents the connection diagram.
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