KROHNE H250 M40 FOUNDATION FIELDBUS - Manual (Page 63)

OPERATION
4
63
H250 M40
www.krohne.com 02/2014 - 4001208201 - AD H250 M40 FF R02 en
CONTROL_OPTS CONTROL_OPTS CONTROL_OPTS CONTROL_OPTS
Control Options Control Options Control Options Control Options
RW Options which the user may select to alter the calculations
done in a control block.
No option selected
Setting:
• Bypass Enable: This parameter, if true, allows BYPASS to be
set. Some control algorithms cannot provide closed loop
control if bypassed.
• SP-PV Track Man: Permits the setpoint to track the process
variable when the block mode is "Man".
• SP-PV Track ROut: Permits the setpoint to track the process
variable when the block mode is "ROut".
• SP-PV Track LO-IMan: Permits the setpoint to track the
process variable when the block mode is "LO or IMan".
• SP Track retain: Permits the setpoint to track the RCas or
Cas parameter based on the retained target mode when the
actual mode of the block is "Man, LO, Man, or Rout".
• Direct acting: Defines the relationship between changes in
PV and changes to output - when direct is selected, an
increase in PV results in an increase in the output.
• Track enable: This enables the external tracking function –
when TRK_ENA is 1, the preset value in TRK_VAL is output if
TRK_IN_D becomes true.
• Track in manual: This is used only if TRK_ENA is YES (1) -
when the block mode is Man, TRK_IN_D will be acted on only
if the TRK_OVMAN control option is set.
• PV for BKCal_Out: The BKCAL_OUT value may be selected
as the working SP or the PV - normally, BKCAL_OUT is the
working SP.
• Restrict SP to limits in Cas and RCas: If this option is
selected, the setpoint will be restricted to the setpoint
absolute and rate limits in Cas and Rcas modes.
• No output limits in Man: Do not apply OUT_HI_LIM or
OUT_LO_LIM when target and actual modes are "Man".
DV_HI_ALM DV_HI_ALM DV_HI_ALM DV_HI_ALM
Deviation High Deviation High Deviation High Deviation High
Alarm Alarm Alarm Alarm
The status and time stamp associated with the high deviation
alarm.
Unacknowledged RW A discrete enumeration which is set to "Unacknowledged"
when an alarm occurs, and set to "Acknowledged" by a write
from a human interface device or other entity which can
acknowledge that the alarm/event has been noticed.
Uninitialized
Setting:
Uninitialized / Acknowledged / Unacknowledged
Alarm State R A discrete enumeration which gives an indication of whether
the alert is active and whether it has been reported.
Uninitialized
Setting:
• Uninitialized
• Clear - reported: Alarm not active and reported
• Clear - not reported: Alarm not active and not reported
• Active - reported: Alarm active and reported
• Active - not reported: Alarm active and not reported
Proportional Integral Derivative Block
Parameter
DD Name Access Description
settings Initial Value
AD_H250_M40_FF_R02_en_4001208201_PRT.book Page 63 Friday, February 21, 2014 11:25 AM