Parker PDHX-E Series User Manual page 29

In either case, the input is OFF (i.e. inactive) when in the open circuit condition. This
condition is described as the logic 0 state and will return a '0' in response to the input status
request IS.
Signal Type A
Apply to all dedicated and user definable inputs. Signal type A inputs can be operated at 5V
or 24V and can be configured, by software, for operation as active high or active low inputs.
The input circuit for "A inputs" is shown in Figure 3-6.
Inputs can be programmed to operate as pull-down (sink) inputs or pull-up (source) inputs.
The pull-up voltage may also be programmed as 5V or 24V. This is achieved by using the
circuit arrangement shown in Figure 3-6, where PROG VOLTS can be programmed to 0V
(pull-down), 5V or 24V (pull-up).
Table 3-8 defines the required settings for 5V and 24V operation and the different input
characteristics between the two settings.
Signal type
Input Characteristics
Logic 1 level (Input ON)
Logic 0 level (Input OFF)
Hysteresis
Max. input voltage range
Signal type A inputs may be configured as Pull down (sink) inputs or as Pull up (source)
inputs. The inputs are programmed using the ICON command. ICON is also used to set the
pull up voltage level and the value of Vs supplied to the customer.
Signal Type B
Signal type B outputs can also be defined in software, using the OCON command. Outputs
can be programmed as NPN or PNP.
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PROG VOLTS
10K
100K
IN
10nf
Figure 3-6. Signal Type A Input Circuit
Table 3-8. 5V and 24V Operation for Signal Type A Inputs
0V
5V Operation
B
Active Active
high low
>3.0v <2.5v
<2.5v >3.0v
0.5v 0.5v
0-30v 0-30v
24v Operation
A
Active Active
high low
>9.0v <5.7v
<5.7v >9.0v
3.3v 3.3v
0-30v 0-30v