GE VersaMax PLC, Руководство пользователя

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11.21 SVCREQ 29: Read Elapsed Power Down Time
Use SVCREQ 29 to read the amount of time elapsed between the last power-down and
the most recent powerup. If the watchdog timer expired before power-down, the PLC is
not able to calculate the power down elapsed time, so the time is set to 0.
The SVCREQ output is always ON.
11.21.1 Output Parameter Block for SVCREQ 29
This function has an output parameter block only. The parameter block has a length of 3
words.
address
Power-Down Elapsed Seconds (low order)
a 1
Power-Down Elapsed Seconds (high order)
a 2
zero
The first two words are the power-down elapsed time in seconds. The last word is always
0.
11.21.2 Example of SVCREQ 29
In the example, when input %I0251 is ON, the Elapsed Power-Down Time is placed into
the parameter block that starts at %R0050. The output coil (%Q0001) is turned on.
CONST
00029
SVC_
REQ
FNC
PARM
%R0050
%I0251 %Q0001
The Service Request Function GFK-1503E User Manual 223
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