Endress+Hauser Proservo NMS83 Operating Instructions Manual page 100

Commissioning
100
9.5.5 Configuration of the digital inputs
There is a Digital Xx-x submenu for each digital input of the device. "X" designates the slot
in the terminal compartment, "x-x" the terminals within this slot. The most important
parameters of this submenu are Operating mode and Contact type.
The "Operating mode" parameter
Setup → Advanced setup → Input/output → Digital Xx-x → Operating mode
A
A "Operating mode" = "Input passive"
B "Operating mode" = "Input active"
Meaning of the options
• Input passive
The DIO module measures the voltage provided by an external source. Depending on the
status of the external switch, this voltage is 0 at the input (switch open) or exceeds a
certain limit voltage (switch closed). These two states represent the digital signal.
• Input active
The DIO module provides a voltage and uses it to detect whether the external switch is
open or closed.
The "Contact type" parameter
Setup → Advanced setup → Input/output → Digital Xx-x → Contact type
This parameter determines how the state of the external switch is mapped to the internal
states of the DIO module:
State of the external switch
Open
Closed
During start-up
Fault in measurement
The internal state of the Digital Input can then be transferred to a Digital Output or can be
used to control the measurement.
The Digital Xx-x submenu contains additional parameters for a more detailed
configuration of the Digital Input. For a description refer to →  205.
B
DIO
Internal state of the DIO module
Contact type = Normally open
Inactive
Active
Unknown
Error
Proservo NMS83
DIO
Contact type = Normally closed
Active
Inactive
Unknown
Error
Endress+Hauser
A0029262