ALN, ALNI – Alarms for numerical value

Block SymbolsLicensing group: STANDARD

Function Description
Blocks ALN and ALNI are intended for generating two-level alarms or events when the numerical value of input u exceeds (undershoots) one of the alarm limits. iac output indicates alarm (event) status. The men parameter (or input) specifies which of the boundaries are monitored. You can choose between the following limits:

LA - low-alarm
HA - high-alarm
LLA - second low-alarm
HHA - second high-alarm

and their combinations.

The ALNI block is an extension of the ALN block. The blocks differ only in that most of the inputs of the ALNI block are parameters of the ALN block. The ALN block does not have the HHA, HA, LA, LLA and NACK outputs.

Individual limit values can be set by the parameters (inputs) l, h, ll and hh. The hys value determines the alarm hysteresis. The outputs HHA, HA, LA, LLA and NACK indicate whether the alarm is active/unacknowledged.

Events and alarms are distinguished in the REXYGEN system using the lvl parameter. The list of archives for writing is specified by the arc parameter, e.g. 1,3..5,8. The event identification code in the archive id must be unique in the entire target device with the REXYGEN control system. For more information about these parameters see the introduction of Chapter 10. Positive values of the iac output codes can be added, e.g. the value 514 means that the upper alarm is unacknowledged. However, not all combinations make sense.

Note 1: The input (parameter) iACK is set back to 0 immediately by the block algorithm. The functionality is similar to the parameter BSTATE of the block MP.

Note2: The parameter Desc can include formatting characters (multilingual texts, associated variables). Formatting rules are described in the ALARMS block.

This block does not propagate the signal quality. More information can be found in the 1.4 section.

Input

u	Analog input of the block	Double (F64)
men	Enable alarms (mask) $⊙$ 15	Long (I32)
	0 .... All alarms disabled 1 .... Low-alarm (LA) enabled 2 .... High-alarm (HA) enabled 3 .... LA and HA enabled 4 .... Second low-alarm (LLA) enabled 5 .... LA and LLA enabled 6 .... HA and LLA enabled 7 .... LA, HA and LLA enabled 8 .... Second high-alarm (HHA) enabled 9 .... LA and HHA enabled 10 ... HA and HHA enabled 11 ... LA, HA and HHA enabled 12 ... LLA and HHA enabled 13 ... LA, LLA and HHA enabled 14 ... HA, LLA and HHA enabled 15 ... All alarms enabled
hys	Alarm hysteresis $↓$ 1e-10 $↑$ 1e+10	Double (F64)
hh	The second high-alarm limit	Double (F64)
h	High-alarm limit	Double (F64)
l	Low-alarm limit	Double (F64)
ll	The second low-alarm limit	Double (F64)
tout	Alarm activation delay time [s] $↓$ 0.0	Double (F64)
iACK	Alarm acknowledge (mask)	Byte (U8)
	1 .... Low-alarm (LA) acknowledge 2 .... High-alarm (HA) acknowledge 4 .... Second low-alarm acknowledge (LLA) 8 .... Second high-alarm acknowledge (HHA)

Parameter

acls	Alarm class (data type) $⊙$ 8	Byte (U8)
	1 .... Bool 2 .... Byte (U8) 3 .... Short (I16) 4 .... Long (I32) 5 .... Word (U16) 6 .... DWord (U32) 7 .... Float (F32) 8 .... Double (F64) 10 ... Large (I64)
arc	List of archives to write the events to	Word (U16)
id	Unique archive item ID $⊙$ 1	Word (U16)
lvl1	Level of low and high alarms $↓$ 1 $⊙$ 1	Byte (U8)
lvl2	Level of the second low and high alarms $↓$ 1 $⊙$ 10	Byte (U8)
group	Group to which the alarm belongs $↓$ 0 $↑$ 9.22337E+18	Large (I64)
Desc	Alarm description string $⊙$ Alarm Description	String

Output

iac	Current alarm code	Long (I32)
	0 .... Signal within limits 1 .... Low-alarm active (LA) 2 .... High-alarm active (HA) 4 .... Second low-alarm active (LLA) 8 .... Second high-alarm (HHA) active 256 .. Low-alarm (LA) not acknowledged (NACK) 512 .. High-alarm (HA) not acknowledged (NACK) 1024 . Second low-alarm (LLA) not acknowledged (NACK) 2048 . Second high-alarm (HHA) not acknowledged (NACK) -1 ... Invalid alarm limits
E	Error indicator	Bool
	off .. No error on ... An error occurred
HHA	The second high-alarm indicator	Bool
HA	High-alarm indicator	Bool
LA	Low-alarm indicator	Bool
LLA	The second low-alarm indicator	Bool
NACK	Not-acknowledged-alarm indicator	Bool

[Previous] [Back to top] [Up] [Next]