ABB EasyLine EL3000 Operating Instruction page 196

196 EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
... 13 Maintenance
... Device test
Keypad Test
Figure 111: Keypad Test
5 square fields appear on the display.
Test:
If the user presses any button, the respective field that is
assigned to the button is inverted (becomes dark) for as long
as the button remains pressed.
The keyboard test is terminated by pressing the OK key twice.
I/O Test (Test of inputs and outputs)
Testing the digital inputs
Figure 112: Menu 'Test Digital Inputs'
The list shows the digital inputs (DI) that are available on the
digital I/O modules installed in the device, see Digital I/O
module on page 97.
They are designated according to the installation locations of
the digital I/O modules (X20, X22, X24, X26).
Test:
1. Disconnect the plug with the connected signal lines from
the Digital I/O module.
2. Close the digital input to be tested with a wire jumper or
similar.
Result:
The status indication changes from 'OK' to 'Test' and the
'Function check' status signal is set.
The function assigned to the digital input is not activated
during the test.
3. Test another digital input in the same manner.
The digital inputs test is terminated by pressing the  button or
after approximately 5 minutes by the time-out function, which
resets all digital inputs to the 'OK' state and deletes the
'Function check' status signal.