Elpro Technologies 450U-E Wireless Ethernet Modem & Device Server User Manual
16
www.cooperbussmann.com/wirelessresources
Rev Version 1.0.12-Beta7
Digital Output
The I/O channel can also be used as a discrete output. The digital output uses a FET transistor rated at 30VDC 500 mA,
and can be used to switch a load, i.e. relay coil or contactor.
The output can be activated by manually writing a value of
re
by utilising the onboard Modbus TCP Server or Serial Modbus Master to turn
on the output. It could also be accessed from an external Modbus Server, i.e. a PLC, DCS, Scada,
etc. via the Ethernet network or Serial interface.
When activating the output the I/O indication on the front panel of the module will be lit RED when
the output is on.
Note: The Digital Output will override the Digital Input operation, i.e. if the output is activated while
the DIO is being read the indication will show the input as being on (1).
Digital Input
When used
supports voltage free contact connection such as a mechanical switch or a
NPN transistor device such as an electronic proximity switches.
Contact wetting current of the input is approximately 5mA and is provided to maintain reliable operation for driving relays.
The digital input is activated by connecting between the "DIO" and
M" terminals.
When activating the input the I/O indication on the front panel of the module will be lit GREEN when
the input is switched on (closed/shorted). Provided the resistance of the switching device is less than
200 ohms, the device will be able to activate the digital input.
PNP transistor devices are not suitable.
Figure 19- DIO Input (Switch)
Figure 17 - DIO Output
Figure 18 - Digital Input (Transistor)
Figure 16 - Analog Input