Siemens PROFIBUS PA SIPART PS2 Manual page 101

43. FCT
44. TIM
45. LIM
46. STRK
47. DCHG
SIPART PS2 PA Manual
A5E00127926-03
Function of the fault message output
If fault messages are used as a monitor for control non-conformities
over a period of time, they will be triggered in addition by the following
events also:
Power failure
S
Processor fault
S
Actuator fault
S
Valve fault
S
Compressed air failure
S
Responses of the limit values 46 to 50
S
Note that the fault message cannot be switched off, however it can be
suppressed (factory setting), if the actuator is set to "non--automatic
mode". If it is wished to generate fault messages here also, the param-
eter FCT must be set to " nA".
In addition there is also the facility to "alternate" the fault message us-
ing the status of the binary inputs. For this, set the parameter FCT to
"" nAb"".
Select the setting "-- " if the fault message is to be sent inverted on the
alarm module or SIA module.
Monitoring time for setting the fault messages
The set value(s) serves as a specification for the time within which the
positioner must have reached the controlled state. The corresponding
response threshold is specified with "45. LIM".
The fault message output is set on exceeding the set time.
Response threshold of the fault message
Here a value (%) can be set for the permissible variable of control error
for releasing the fault message.
If the parameters "44. TIM" and "45. LIM" are both set to "Auto" (factory
setting), the fault message is set if the slow step zone is not reached
within a certain time. This time is 2 times the initialization travel time
within 5 to 95% of the actuating path and 10 times this time outside 10
to 90% of the actuating path.
Limit value for monitoring the travel integral (number of strokes)
A limit value for the way integral can be set here. If the way integral
exceeds the limit value, the fault message output (optional) is activated.
This function enables a preventive maintenance of the fitting, see also
chapter 4.5 "Diagnostics", page 103.
This monitoring function can not be deactivated.
Limit value for monitoring the changes of direction
A limit value for the direction change counter can be set here. If this
counter exceeds the limit value, the fault message output is activated.
Operation
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