Emerson Oxymitter 5000 Instruction Manual page 144

Model 4081FG Oxygen Analyzer with F
TABLE C-1. PID Function Block System Parameters.
Parameter Index
Number
ACK_OPTION 46
ALARM_HYS 47
ALARM_SUM 45
ALERT_KEY 04
ALG_TYPE 74
BAL_TIME 25
BIAS 66
BKCAL_HYS 30
BKCAL_IN 27
BKCAL_OUT 31
BLOCK_ALM 44
BLOCK_ERR 06
BYPASS 17
CAS_IN 18
CONTROL_OPTS 13
DV_HI_ALM 64
DV_HI_LIM 57
DV_HI_PRI 56
C-2
OUNDATION
To further customize the block for use in your application, you can
configure filtering, feedforward inputs, tracking inputs, setpoint and
output limiting, PID equation structures, and block output action.
Table C-1 lists the PID block parameters and their descriptions, units of
measure, and index numbers, and Figure C-1 on page C-5 illustrates
the internal components of the PID function block.
Units
None Used to set auto acknowledgment of alarms.
Percent The amount the alarm value must return to within the alarm limit before the associated active
alarm condition clears.
None The summary alarm is used for all process alarms in the block. The cause of the alert is
entered in the subcode field. The first alert to become active will set the Active status in the
Status parameter. As soon as the Unreported status is cleared by the alert reporting task,
another block alert may be reported without clearing the Active status, if the subcode has
changed.
None The identification number of the plant unit. This information may be used in the host for
sorting alarms, etc.
None Selects filtering algorithm as Backward or Bilinear.
Seconds The specified time for the internal working value of bias to return to the operator set bias.
Also used to specify the time constant at which the integral term will move to obtain balance
when the output is limited and the mode is AUTO, CAS, or RCAS.
EU of OUT_SCALE The bias value used to calculate output for a PD type controller.
Percent The amount the output value must change away from the its output limit before limit status
is turned off.
EU of OUT_SCALE The analog input value and status from another block's BKCAL_OUT output that is used for
backward output tracking for bumpless transfer and to pass limit status.
EU of PV_SCALE The value and status required by the BKCAL_IN input of another block to prevent reset
windup and to provide bumpless transfer of closed loop control.
None The block alarm is used for all configuration, hardware, connection failure, or system
problems in the block. The cause of the alert is entered in the subcode field. The first alert
to become active will set the active status in the status parameter. As soon as the
Unreported status is cleared by the alert reporting task, and other block alert may be
reported without clearing the Active status, if the subcode has changed.
None This parameter reflects the error status associated with the hardware or software
components associated with a block. It is a bit string so that multiple errors may be shown.
None Used to override the calculation of the block. When enabled, the SP is sent directly
to the output.
EU of PV_SCALE The remote setpoint value from another block.
None Allows you to specify control strategy options. The supported control options for the PID
block are Track enable, Track in Manual, SP-PV Track in Man, SP-PV Track in LO or IMAN,
Use PV for BKCAL OUT, and Direct Acting
None The DV HI alarm data, which includes a value of the alarm, a timestamp of occurrence, and
the state of the alarm.
EU of PV_SCALE The setting for the alarm limit used to detect the deviation high alarm condition.
None The priority of the deviation high alarm.
fieldbus Communications
Description