The AO Function Block converts the output value from an upstream function block into a
control value for the valve.
Execution time: 20 ms
4
Two Discrete Input Function Blocks
The DI Function Blocks are used as inputs to control binary signals. They support the se
-
lection of binary switching conditions of various functions.
Execution time: 40 ms
4
One PID Function Block
The PID controller has a flexible proportional-integral-differential control algorithm which
can be configured as required to match the application.
Execution time: 60 ms
15.3 Resetting the device
The positioner can be reset in various ways in accordance with the FF specification.
RESTART (16) parameter in the Resource Block:
4
DEFAULTS:
The device data and the link are reset to the values as defined in the FF specification.
4
PROCESSOR:
Warm start of the positioner, restart of the processor.
15.4 Status classification and condensed state
The status alarms are classified in the positioner, i.e. when an alarm is issued, it is assigned
a status. The classification of the states can be changed over the following FF parameters in
the AO Transducer Block:
4
ERROR_OPTION_INIT_FAILURE (36):
Masking of the initialization error
4
ERROR_OPTION_OPERATION_FAILURE (37):
Masking of the operational error
4
ERROR_OPTION_HW_FAILURE (38):
Masking of the hardware error
4
ERROR_OPTION_DATA_FAILURE (39):
Masking of the data error
4
ERROR_OPTION_ENH_DIAGNOSTIC (40 to 44):
Masking of the status and fault alarms generated by the diagnostics
76 EB 8384-5 EN
Fieldbus specification
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