COMMISSIONING
Part No.: 4417340 Revision 1 Service Manual 149
954 SmartServo FlexLine
7.3.9.2 Functional Description
HCI-HAO is a HART slave module, which uses standard HART
communication to communicate with HART-devices. This
module makes use of the Bell 202 Frequency Shift Keying
(FSK) standard to superimpose digital signals at a low level on
the 4–20 mA analog signal.
Figure 7-26 The analog and digital signals within the HART® communication
The HCI-HAO works as an interface board between
FlexConn boards and a HART master, and it makes the data
available on the HART bus.
The user needs to set the required linked variable
details.
The linked primary variable is mapped between 4–20 mA on the
analog output depending on the range values set. The linked
variables are scanned every 1 second and so is the analog
output refresh rate.
The HCI-HAO is configurable by:
 a HART communicator
 a local HART SmartView
 Engauge
The HCI-HAO (board ID = 11) has following two
functions:
Function Category Type Sub-type
1 - HART communication Communication Instrument slave HART
2 - Analog output Sensor Analog output 4 - 20 mA
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