If the time constant is inadequate, the setting of 'b1.TIM' can be
changed manually. Set the time constant in a range from '1' to '400'.
In this case:
● Setting '1' indicates a very weak attenuation.
● Setting '400' indicates a strong attenuation.
The currently determined deviation is displayed in Diagnostics val‐
ue '15.DEVI - Dynamic control valve behavior' (Page 263). The
positioner triggers a message if the current value exceeds one of
the three parameterizable thresholds.
Factory setting: Auto
b2.LIMIT - Limit
Adjustment range: 0.1 ... 100.0
Purpose: Use this sub-parameter to set a base limit in percent. The base limit
defines the magnitude of the permissible deviation from the expec‐
ted position course. The limit serves as a reference variable for the
fault message factors.
Set the base limit in a range from '0.1' to '100.0'.
Factory setting: 1.0
b3.FACT1 - Factor 1
Adjustment range: 0.1 ... 100.0
Purpose: Use this sub-parameter to set the factor for formation of threshold 1.
Set the factor in a range from '0.1' to '100.0'. The threshold is the
product of 'b2.LIMIT' and 'b3.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: 5.0
b4.FACT2 - Factor 2
Adjustment range: 0.1 ... 100.0
Purpose: Use this sub-parameter to set the factor for formation of threshold 1.
Set the factor in a range from '0.1' to '100.0'. The threshold is the
product of 'b2.LIMIT' and 'b4.FACT2'.
The threshold 2 message is displayed when threshold 2 is excee‐
ded. This message is only output if threshold 3 is not exceeded at
the same time. The process to activate and display this message is
described in the 'XDIAG' parameter.
Factory setting: 10.0
Parameter assignment
8.3 Description of parameters
SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC 169
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