Samson foundation 3787, Mounting And Operating Instructions, Page: 67 / 96

Parameters of the PID Function Block
ACK_OPTION S
Index: 46
Access:
r, w
Option:
Default:
This parameter allows you to choose whether an alarm should be automatically
acknowledged in the device, i.e. without any influence from the fieldbus host system.
Undefined No option
HI_HI_ALM High high alarm
HI_ALM High alarm
LO_LO_ALM Low low alarm
LO_ALM Low alarm
DV_HI_ALM Limit alarm for upper range deviation
DV_LO_ALM Limit alarm for lower range deviation
BLOCK ALM Block alarm
Undefined
Note:
The alarm is sent to the fieldbus host system, but not acknowledged by it.
ALARM_HYS S
Index: 47
Access:
r, w
Input:
Default:
Used to input the hysteresis for the high and low alarm limits.
The alarm conditions remain active as long as the measured value is within the
hysteresis. The hysteresis value has an effect on the following alarm limits of the PID
Function Block:
HI_HI_LIM
HI_LIM
LO_LO_LIM
LO_LIM
DV_HI_LIM
DV_LO_LIM
0...50 %
0.5 %
Note: The hysteresis value in percent applies to the range of the PV_SCALE parameter
group in the PID Function Block.
ALARM_SUM S + D
Index: 45
Access:
r, w
Display:
Shows the current status of process alarms in the PID Function Block
HI_HI_ALM Violation of the high high alarm
HI_ALM Violation of the high alarm
LO_LO_ALM Violation of the low low alarm
LO_ALM Violation of the low alarm
DV_HI_ALM Violation of the limit alarm for the upper range deviation
DV_LO_ALM Violation of the limit alarm for the lower range deviation
BLOCK ALM Block alarm
Note: Additionally, the process alarm can be cleared in this parameter group.
EB 8383-1 EN
67
Parameter description