Limit monitoring
The block monitors the process values
PV1, PV2, PV3
and
PV4
if they are configured for
limits. All values are written cyclically from the module 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
bit 7).
You can monitor the process values
PV1, PV2, PV3
and
PV4
for the following high and low
alarm and warning limits:
●
(In)PV1/PV2/PV3/PV4_AH_Lim
: Limit for high alarm
●
(In)PV1/PV2/PV3/PV4_AL_Lim
: Limit for low alarm
●
(In)PV1/PV2/PV3/PV4_Hyst:
Hysteresis
●
(In)PV1/PV2/PV3/PV4_WH_Lim
: Limit for high warning
●
(In)PV1/PV2/PV3/PV4_WL_Lim
: Limit for low warning
The result of limit monitoring is returned at the interconnectable output parameters:
●
PV1/PV2/PV3/PV4_AH_Act
= 1: Limit for high alarm reached or exceeded
●
PV1/PV2/PV3/PV4_AL_Act
= 1: Limit for low alarm reached or undershot
●
PV1/PV2/PV3/PV4_WH_Act
= 1: Limit for high warning reached or exceeded
●
PV1/PV2/PV3/PV4_WL_Act
= 1: Limit for low warning reached or undershot
Monitoring is always enabled using the input parameters:
●
PV1/PV2/PV3/PV4_AH_En
= 1: Monitoring of the high alarm limits
●
PV1/PV2/PV3/PV4_AL_En
= 1: Monitoring of the low alarm limits
●
PV1/PV2/PV3/PV4_WH_En
= 1: Monitoring of the high warning limits
●
PV1/PV2/PV3/PV4_WL_En
= 1: Monitoring of the low warning limits
The corresponding message is suppressed using the parameters:
●
PV1/PV2/PV3/PV4_AH_MsgEn
= 0: Alarm (high) messages are suppressed
●
PV1/PV2/PV3/PV4_AL_MsgEn
= 0: Alarm (low) messages are suppressed
●
PV1/PV2/PV3/PV4_WH_MsgEn
= 0: Warning (high) messages are suppressed
●
PV1/PV2/PV3/PV4_WL_MsgEn
= 0: Warning (low) messages are suppressed
You can define a hysteresis (
PV1/PV2/PV3/PV4_Hyst
) for the limits, for example to
suppress signal flatter. You can also modify the limits and hysteresis via the faceplate.
Gradient monitoring
The gradient
PV1_Grad
is calculated by means of a delay function configurable
using
LagTime
. During calculation of the gradient, jumps in the input value
PV1
are smoothed.
The peak values of the gradient are output in the output parameters
PV1_GradNP
(negative
gradient) and
PV1_GradPP
(positive gradient). These are reset when the operator enters the
corresponding command for resetting.
SITRANS FC430 PA
13.1 SiFC43PA
SITRANS Library for PCS 7
554
Function Manual, 05/2019, A5E35351976-11
Summary of Contents for SITRANS PCS 7
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Page 418: ...SITRANS P 10 2 SitraPDr SITRANS Library for PCS 7 418 Function Manual 05 2019 A5E35351976 11 ...
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