60 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Chapter 2 Install the Dynamix 1444 Series Monitoring System
High/Low Signal Output
An appropriate circuit must be implemented when any of the outputs, other
than the TTL speed signals, are selected.
Because the outputs are not internally powered, pull up circuitry must be
applied when a voltage (digital) output is required. See Figure 15
for an
example of an appropriate circuit.
Figure 15 - Circuit Example
In the Figure 15 example, when the output is open or low, the voltage across
pins OH and OL is the supply voltage, and the voltage drop across the resistor
is 0V DC. When the output is high, the pin output drops to zero, and the
voltage drop across the resistor is approximately 3.3V DC with a 5V DC input,
due to the flow of current through the isolating resistor.
The example in Figure 15
illustrates a 5V supply, with a typical current of 5
mA, a maximum supply voltage of 32V DC, and a maximum circuit current
per output is 15 mA.
IMPORTANT • The opto-isolated outputs are not protected. Excess
current or voltage could damage the output. The output,
and possibly the module, could be unusable. Make sure
that the circuit cannot exceed 32V, or a 6V reverse voltage
and 15 mA current.
• The intent of this output is to provide signal where the
output is wired to an input device that draws low current.
The output is not intended for use to power a relay coil.
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