PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke
PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke
PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke
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PLC error and failure handling<br />
2nd stage<br />
1st alternative<br />
Cause<br />
Reaction<br />
Supply voltage rises back to 24 V DC ± 20%<br />
-- "failure" LED will extinguish<br />
-- error byte "ERR00.00" will be reset<br />
-- the program run will be continued without interruption<br />
2nd alternative<br />
Cause<br />
Supply voltage continues to fall, c. < 8.5 V<br />
Reaction<br />
5 V system voltage will be interrupted<br />
=> - STOP: the program run will be stopped<br />
- RESET: outputs, error byte (ERR00.00) and<br />
-- unbuffered markers, timers and counters<br />
will be reset<br />
- all LEDs off<br />
Remedy<br />
-- as a precaution, in the user program, to save buffered<br />
operands:<br />
Processing of the user program should be interrupted until<br />
the 2nd stage of the cause has been reached or until a<br />
realistic delay period has elapsed.<br />
program example for interrupt module no. 17:<br />
WAIT 5 ;wait 5 * 10 ms=50 ms<br />
L ERR00.00 ;scan error byte<br />
CMP 2 ;still undervoltage?<br />
JP RETURN ; jump if not<br />
RETURN<br />
WAIT 5 ;wait for 5*10ms=50ms<br />
CMP 2 ;still undervoltage?<br />
RESET<br />
; RESET and Stop PLC<br />
NOP<br />
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