8.4.3.11 Monitoring of number of changes in direction 'O.\\DCHG'
O. DCHG - Monitoring of number of changes in direction
Condition: The '52.XDIAG' Activating for extended diagnostics (Page 162) pa‐
rameter is set to 'On1', 'On2' or 'On3'.
Possible settings: ● OFF
● On
Purpose: Use this parameter to continuously monitor the number of changes
in direction of the actuator beyond the deadband. Monitoring is per‐
formed in three steps. Set the following sub-parameters appropri‐
ately. To activate monitoring, set the parameter to 'On'. Sub-pa‐
rameters are displayed.
The current value is displayed in Diagnostic value '2.CHDIR - Num‐
ber of changes in direction' (Page 215). The positioner triggers a
message if the current value exceeds one of the three thresholds.
Factory setting: OFF
O1.LIMIT - Limit
Adjustment range: 1 ... 1.00E8
Purpose: Use this sub-parameter to set the base limit for the changes of
direction of the actuator. Set the base limit in a range from '1' to
'1.00E8'.
Factory setting: 1.00E6
O2.FACT1 - Factor 1
Adjustment range: 0.1 ... 40.0
Purpose: Use this sub-parameter to set the factor for formation of threshold 1.
Set the factor in a range from '0.1' to '40.0'. The threshold is the
product of 'O1.LIMIT' and 'O2.FACT1'.
The threshold 1 message is displayed when threshold 1 is excee‐
ded. This message is only output if threshold 2 or 3 is not exceeded
at the same time. The process to activate and display this message
is described in the 'XDIAG' parameter.
Factory setting: 1.0
Parameter assignment
8.4 Description of parameters
SIPART PS2 with 4 to 20 mA/HART
184 Operating Instructions, 11/2019, A5E00074631-AE
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