West Control Solutions KS98-1 - Manual (Page 153)

III-8.6 ALARM ( alarm processing (No. 45) )
x1 is checked for a lower and an upper alarm value. Additionally, digital alarm input fail can be used. Configura-
tion parameter
Fnc can be used to select which signal shall be monitored (x1, x1 + fail or fail).
With input stop = 1, alarms (fail and x1) are suppressed. After removal of this signal, suppression lasts, until
the monitored value is again within the limits. This can be used e.g. for suppressing an alarm message with change.
During value change at the exit xw
sup a pulse with the length of a
scanning cycle Ts is sent.
Inputs/outputs
Digital inputs
fail Digital alarm signal e.g. fail signal of AINP
stop
stop = 1, alarms (fail and x1) are suppressed. After stop returned to 0, suppression lasts, until the
monitored value is again within the limits.
Analog input
x1 Input variable to be limited
Digital output
alarm Alarm status: 0 = no alarm; 1= alarm
Configuration parameter:
Parameter Description Range Default
Fnc Alarm function
only x1 is monitored Mes.val.X1 t
x1 and fail are monitored X1 + fail
only fail is monitored fail
Parameters:
Parameter Description Range Default
LimL lower limit for the alarm -29 999 ... 999 999 -10
LimH upper limit for the alarm -29 999 ... 999 999 10
Lxsd Switching hysteresis Xsd 0 ... 999 999 10
Limit value signalling and limiting 9499-040-82711
III-153 ALARM ( alarm processing (No. 45) )
stop
fail LimL
LimH
Xsd
x1
Fnc
alarm
Fig. 16 Alarm suppression with change