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...4 CONFIGURATION
4.7.3 Hybrid Modules
92
Select a digital output source.
Notes.
• A digital output source is the internal digital source used to
activate/de-activate a digital output.
• If a digital output is used to provide a totalizer count pulse,
the maximum pulse frequency is 5Hz.
Select the relay source polarity.
Note. When polarity is set to 'Positive', the relay is
energized when the digital source is active (On).
The six digital inputs from any hybrid module produce six
independent digital states that can be used as digital
sources for recording channels, relay outputs, alarm
acknowledgement etc., e.g.:
Digital I/P C1, Digital I/P C2
Additionally, digital inputs from a hybrid module in position D
(see Fig. 5.5) can be used to produce up to 32 Binary
Encoded (BCD) digital states, e.g.:
BCD digital I/P D0 to BCD digital I/P D31
BCD digital inputs can be used as digital sources in the same
way as standard digital inputs.
Inputs D1, D2, D3, D4 and D5 have 'weightings' of 1, 2, 4, 8,
and 16 respectively. A rising edge on input D6 is used as the
update trigger.
Following an inactive to active transition on input D6, inputs
D1 to D5 are evaluated, the weighted values of any active
inputs are added together and the BCD digital input
corresponding to the total is activated. All other BCD digital
inputs are deactivated.
Example.
If digital inputs D1 ( weighting = 1), D2 (weighting = 2) and D4
(weighting = 8) are active when digital input D6 (update
trigger) is activated, BCD digital input D11 (1 + 2 + 8) is
activated. BCD digital inputs D0 to D10 and BCD digital
inputs D12 to D31 are deactivated.
If digital inputs D1 to D5 are all inactive when digital input D6
(update trigger) is activated then BCD digital input D0 is
activated. BCD digital inputs D1 to D31 are deactivated.
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