Functional Description; The Analog And Digital Signals Within The Hart Communication - Honeywell FlexLine SmartServo 954 Service Manual

COMMISSIONING
7.3.9.2

Functional Description

Figure 7-26
Function
1 - HART communication
2 - Analog output
Part No.: 4417340 Revision 1
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.
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:
Category
Communication
Sensor
Service Manual
954 SmartServo FlexLine
Type
Instrument slave
Analog output
Sub-type
HART
4 - 20 mA
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