ProAct P-Series FL Position Controller
Manual 26659
56
Woodward
Discrete I/O Tab
The Discrete I/O tab provides discrete input and discrete output configuration
settings.
Figure 5-6. Configuration Editor—Discrete I/O Tab
Inputs Section
Discrete Input function assignments are configurable. Each function can be
configured for activation by any of the three discrete inputs. To make discrete
input assignments, see the Setup and CAN tabs. The Discrete I/O tab shows the
actual input assignments. All discrete inputs can be configured for high side, low
side, active closed, and active open contact types.
In a typical engine harness, there is a higher likelihood of unintentional shorts to
battery minus than to battery plus. In such cases, using a high side setting
reduces the chance of a short causing unintended operation. The active open or
active closed setting for each input should be configured for safest operation. If
the most likely failure mode is an open wire, then configure the input to select the
safer engine operation should the wire break.
It is recommended that an engine system Failure Modes and Effects
Analysis (FMEA) be used to determine the discrete input
configuration that provides the lowest probability of unintended
operation in the presence of faults, such as a broken wire.