Siemens SITRANS PCS 7 Function Manual page 683

Activation of the individual monitoring functions is carried out at the corresponding "Enable"
parameters, e.g. GradHUpEn for activating the high gradient limit for positive gradients
(GradHUpLim).
Reaching or violation of your defined limits is indicated at the corresponding "Active" output
parameters, e.g. by means of GradHUpAct = 1 for the limit (high) for the positive gradient.
Messages can be output for these alarms. You can activate these as follows:
● Message for alarms (high) for the positive gradient: GradHUpMsgEn = 1
● Message for alarms (high) for the negative gradient: GradHDnMsgEn = 1
● Message for alarms (low) for the absolute gradient: GradLMsgEn = 1
Suppressing messages using the MsgLock parameter
This block provides the standard "Suppressing messages using the MsgLock parameter"
function that is described in the APL Online Help.
Bypass function
This block provides the standard function Interlocking functions (Page 13).
Selecting a unit of measure
This block provides the standard function Selecting a unit of measure (Page 13). The units for
the 4 to 20 mA signal and the HART variables are configured on the device of the Sitrans LR
via PDM and read by an operator action in the "Parameters" faceplate view with "Read
configuration" or configured by the user himself if HART communication does not exist.
If volume is selected for the 4 to 20 mA signal or one of the HART variables (Sitrans LR 200 or
LR 250), the volume unit must be configured at the PV_Unit0 and PV_Unit1 (4 to 20 mA
signal) or PV_Unit2..4 (HART variables) inputs.
Forming the signal status for blocks
This block provides the standard "Form and output signal status for technological blocks"
function that is described in the APL Online Help.
The worst signal status ST_Worst for the block is formed from the process values:
● PV_In.ST
● PV.ST
● SV.ST
● TV.ST
● QV.ST
Release for maintenance
This block provides the standard "Maintenance enable" function that is described in the APL
Online Help.
SITRANS Library for PCS 7
Function Manual, 05/2019, A5E35351976-11
SITRANS LR HART
15.1 SitrLRHA
683