ABB Navigator 550 Operating Instructions Manual page 49

Navigator 500
Hydrazine analyzer
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Digital I/O
Digital I/O 1 to 6
Type
Source
Polarity
Relays
Relay 1 to 6
Source
Polarity
OI/AHM550–EN Rev. A
Comment
See page 18 for digital I/O connections.
Sets the Digital I/O to operate as an output or an input:
Off – no action taken.
Output – the Digital I/O operates as an output.
Volt Free – high input detected when volt-free switch across input is
closed.
24 Volt – digital input low <5 V, high> 11 V (maximum input 30 V).
Selects the digital signal to be assigned to the output –
see Table 7.2, page 52.
Sets the polarity of the output signal.
Inverted – for an output, if the source is active the output is low. For an
input, if a high signal is detected the input is inactive.
Non Inverted – for an output, if source is active the output is high. For
an input, if a low signal is detected the input is inactive.
Relays 5 and 6 are available only if an option board is fitted – see page
18.
Selects the digital signal to be assigned to the relay –
see Table 7.3, page 52.
Sets the polarity of the relay:
Inverted – if the source is active the relay is energized.
Non Inverted – if the source is inactive the relay is energized.
Off
None
Non Inverted
None
Non Inverted
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