
AV-300i Version 2 User’s Guide
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1.12.7 Alarm Status on a Digital Variable
The alarm state can be reported via three Words.
Each bit determines an alarm state. It is therefore possible to determine the state of 48 alarms.
Each single bit can be controlled if the corresponding bit of a specific mask is set with 1, otherwise their setting is
always 0.
When an alarm becomes active, the word corresponding bit is set with 1. Its setting remains equal to 1 till the alarm
becomes inactive and the “State Machine or Sequencer” is not in an alarm condition (see the previous paragraphs).
If the state of a single alarm has to be controlled via an output, then only the mask needed bit has to be set with 1.
If the state of several alarms has to be controlled via an output, then the mask corresponding bits have to be set with 1.
The alarms have to be controlled by the Word itself.
Ex: the state of the External fault alarm has to be read.
Mask W1 S1 = 0x0100 => 0000 0001 0000 0000
Mask W2 S1 = 0x0000 => 0000 0000 0000 0000
Mask W3 S1 = 0x0000 => 0000 0000 0000 0000
DO 0 src = Select ipa Alm W1 S1.
The state of the Undervoltage and Overvoltage alarm has to be read.
Mask W1 S1 = 0x0100 => 0000 0000 0000 0110
Mask W2 S1 = 0x0000 => 0000 0000 0000 0000
Mask W3 S1 = 0x0000 => 0000 0000 0000 0000
DO 0 src = Select ipa Alm W1 S1.
The state of the External fault and F_R_C alarm has to be read.
Mask W1 S1 = 0x0100 => 0000 0001 0000 0000
Mask W2 S1 = 0x0000 => 0000 0000 1000 0000
DO 0 src = Select ipa Alm W1 S1.
DO 1 src = Select ipa Alm W2 S1.
See “Alarm List” table in the next page
Summary of Contents for AV-300i
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