Micromod MOD: 30ML Functions Data Base Reference - Manual (Page 64)

MOD 30ML Functions
PROCESS ALARM DISPLAY BLOCK
12
Alarm Activate Value (TRIPVAL) ..................................................................................... CWR
The alarm activate value (trip point) is used with the alarm activate condition and the alarm
input value in the alarm calculation. Configuration of this attribute requires selection of a data
type and entry of a value:
Data Type Select a data type which matches the Alarm Input (Attr. #17 ) data type;
floating point, count, discrete, short state, long state, msec time, or date.
Value Enter the trip point value in the selected data type.
13
Line 1 Text (TAG1) ............................................................................................................ CWR
Text string displayed on first line of the alarm display. The string is limited to 8 characters.
14
Line 2 Text (TAG2) ............................................................................................................ CWR
Text string displayed on second line of the alarm display. The string is limited to 8 characters.
15
Hi Range (HRNG) .............................................................................................................. CWR
100% alarm input value for bar displays or the deviation from low range value for deviation
displays (Figure 2-23).
16
Lo Range (LRNG).............................................................................................................. CWR
0% alarm input value for bar displays or mid-point for deviation displays (Figure 2-23).
17
Alarm Input (ALARMINP).................................................................................................. CWR
This is the input value that is compared with the alarm activate value (trip point) to determine
when there is an alarm. Configuration of this attribute requires specification of the input data
type, and selection of the input source as either local or remote:
Data Type The data type can be floating point, count, date, msec time, discrete, short
state or long state.
Local An input value having the selected data type is entered in the Local field.
The local input can be written.
Remote Connection of an LSP to the alarm input overrides any existing local input
and provides the remote input. The Remote field shows the tag and
mnemonic of the remote input. The input value cannot be written when the
source is remote; the value is readable.
18
Acknowledge Input (ACKINP)..........................................................................................C – R
The acknowledge input is edge triggered so that a value of 0 (FALSE) followed by a value of
1 (TRUE) acknowledges the alarm.
NONE No alarm acknowledgment input. However, the alarm can still be
acknowledged in other ways as described in Section 2.6.1.
LSP A discrete variable is used to acknowledge an alarm and reset the input.
19
Hysteresis (HYST) ............................................................................................................ CWR
Hysteresis applies to floating point alarms only. A floating-point input value often represents
some process variable. Since there is often noise associated with a process variable,
hysteresis is used to suppress the noise. In other words, the use of hysteresis prevents the
alarm state from rapidly fluctuating between active and clear. Configure hysteresis by
entering a floating-point value that determines when an active alarm becomes clear
(inactive). The value cannot be negative.
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