Parker PDHX-E Series User Manual page 84

The response of the output to an active level will depend upon the programmed state of that
output.
Note: Although it has been stated that all output functions can be defined using the OUT
command there is one exception to this:
OUTPUT 1 can be configured as a composite fault output using the SSD command. When
SSD is set to 1 then output 1 is configured as a composite fault output and overrides the
function defined by OUT. SSD must be set to 0 for output 1 to be configured using the OUT
command.
Programmable Output Levels
Outputs can be programmed as NPN or PNP open collector outputs. The circuit arrangement
shown in Figure 7-7 is used. Output voltage levels will be determined by the value of the
external voltage (Vs) and the value of the connected load.
The selection of NPN or PNP outputs is made using the OCON command. For example:
Sets OUT1-3 to be NPN and OUT4-6 to be PNP. Only 6 bits can be set using this command.
Note: the output circuit uses a connected pair of output transistors, consequently when the
NPN transistor is used, but is turned OFF, the external user voltage (Vuser) must be no
greater than Vs.
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1OCON000111
Ext V
PNP
BCX51
OUTn
NPN
BCX54
Ext 0V
Figure 7-7 Output Example
Vuser
External
load