Functions Of Sitrlrpa - Siemens SITRANS PCS 7 Function Manual

14.1.3

Functions of SitrLRPA

The functions for this block are listed below.
Configuration data
The configuration data comprises the units, the configuration of the PV inputs, and the limits for
messages. After a change is made in the device, reading of configuration data must be
triggered with "Read configuration data" in the parameter view of the faceplate. If the
parameters were read back before a complete download to the PLC, the configuration does not
need to be reloaded from the device.
The message limits of the SitrLRPA are only transferred to the device when the alarm
configuration is synchronized with the device (Feature Bit7 = TRUE).
The SitrLRPA function block has the following configuration data which can be read out of the
Sitrans LR 250 by means of the "Read configuration data" command:
Description
Configuration of PV1 and PV2 inputs
Vessel form
Units PV1 and PV2, user-specific units as well as
maximum and minimum values for the alarm and
warning limits of the process values
Limits PV1
LimitsPV2
Limit monitoring
The block monitors the process value 1 PV1 and, if configured, the process value 2 PV2 for
limits. Both values are cyclically integrated into the process image of the controller.
Configuration of the limits is carried out either by means of PDM and imported by reading the
configuration data from the block, or can be carried out on the block independent of the module
(see Feature Bit7).
You can monitor the process value 1 PV1 and the process value 2 PV2 for the following high
and low alarm and warning limits:
● PV1/PV2AH_Lim: Limit for high alarm
● PV1/PV2AL_Lim: Limit for low alarm
SITRANS Library for PCS 7
Function Manual, 05/2019, A5E35351976-11
Block parameters (I/O)
PV1Meas
PV2Meas
TankType
PV1Unit
PV2Unit
UsrUnit1
UsrUnit2
PV1OpScale
PV2OpScale
InPV1AH_Lim/PV1AH_Lim
InPV1WH_Lim/PV1WH_Lim
InPV1WL_Lim/PV1WL_Lim
InPV1AL_Lim/PV1AL_Lim
InPV1Hyst/PV1Hyst
InPV2AH_Lim/PV2AH_Lim
InPV2WH_Lim/PV2WH_Lim
InPV2WL_Lim/PV2WL_Lim
InPV2AL_Lim/PV2AL_Lim
InPV2Hyst/PV2Hyst
SITRANS LR PA
14.1 SitrLRPA
645