Actuator Input Output Signals
Publication PUB089-005-00_0618 35 of 116
5.2 Discrete Input status feedback
The FF CP card has DI (Discrete Input) function blocks that may be used to report the valve and
actuator status over the network. The conventional contact indications are also available from the
actuator limit switches and indication contacts.
Each DI block output has a value between 0 and 255. If the host DCS system uses its ‘Boolean Fan
Out’ function, the returned value may be decoded into 8 individual bits, where each bit represents a
single piece of feedback data. If the DCS does not have this facility, then the state of the first bit in
each DI will be represented by 0 = not true and 1 = true. The complete list of DIs and the function of
the individual bits is indicated in section 5.2.1. The table below indicates which signals are available
from each actuator type.
Notes over page:
- This bit is reported when within the slow mode band, but does not affect the actuator. Slow mode
is not an option in some of the actuators.
- This bit indicates the state of the Hardwired Partial stroke input
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