COMMISSIONING
152 Service Manual Part No.: 4417340 Revision 1
954 SmartServo FlexLine
 Multi-drop mode supported to connect more than one
HART- compatible device on HART bus. For operating the
device in Multi- Drop mode, user needs to select the polling
address to a non-zero value. Making the polling address to a
non-zero value makes the output current mode to
Fixed_4_20_MA (4 mA fixed). Non-zero polling address will
automatically make the output current mode to Fixed_4_20_MA.
All the HART-compatible devices connected over the HART
bus must have different polling addresses. Multi-drop mode is
supported only in Passive mode of loop configuration. When
the output current mode is set to Standard_4_20_MA, the polling
address of the device must be made zero.
 When the device is not in multi-drop mode (STANDARD_4_20_MA
mode selected) then the output current follows the changes in
linked PV value.
 Scanning of each linked available PV, SV, TV and QV on the
CAN- bus with frequency of 1 Hz. That means all the available
linked variables are scanned every 1 second.
 The analog output is refreshed every 1 second, even if there
is no change in the scanned variables. So, the watchdog for
analog output is automatically implemented. If the output is not
refreshed within 45 seconds then a watchdog to analog output
is generated and the output is forced to 0 mA.
 During startup, the analog output of the HCI-HAO module is kept
low (< 0.5 mA). This value will be there till initialization takes
place. Once the normal operation starts the output will follow
the linked PV depending upon the output mode setting.
 Manual overwrite mechanism. This is a standard FlexConn
func-tionality. Separate configuration and command entities
are defined for this. See 7.3.9.5 - Board Commissioning.
7.3.9.4 Calibration of the HCI-HAO
A calibration provision is given, which is used to accurately map the
analog output between 4 -20 mA using the two range values entered for
Primary Variable.
Following table lists all entities required for calibration.
Entity Data Type Type
[Analog Output at 4 mA]
Float non-volatile R/W
[Analog Output at 18 mA]
Float non-volatile R/W
[Calibrate at 4 mA]
Undefined command
[Calibrate at 18 mA]
Undefined command
[Enter Calibration Mode]
Undefined command
[Exit Calibration Mode]
Undefined command
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