FB_BA_Alm

without alarm memory (bRstReqd = FALSE)

• T1: The function block is not enabled (bEn=FALSE). A message at input bIn has not effect on the alarm output bQ.
• T2: The function block is enabled (bEn=TRUE). The alarm output bQ remains set as long as the message is active at input bIn.

with alarm memory (bRstReqd = TRUE)

• T1: The function block is not enabled (bEn=FALSE). A message at input bIn has not effect on the alarm output bQ.
• T2: The function block is enabled (bEn=TRUE). A rising edge at alarm input bIn sets the alarm output bQ. It can be reset through a rising edge at reset input bRst, but only if the message is no longer active at bIn.
• T3: As a rule, alarm messages at bQ are only present if the function block bEn is enabled.

VAR_INPUT

bEn       : BOOL;
bIn       : BOOL;
bRstReqd  : BOOL;
bRst      : BOOL;

bEn: enable of the function block

bIn: message input

bRstReqd: alarm memory activation (requires acknowledgement)

bRst: reset alarm

VAR_OUTPUT

bQ    : BOOL;

bQ: alarm output

Requirements