Svcreq 8: Reset Watchdog Timer; Parameter Block Format For Svcreq 8; Example Of Svcreq 8 - GE VersaMax PLC User Manual

11.9 SVCREQ 8: Reset Watchdog Timer

210 GFK-1503E
For public disclosure
Use SVCREQ 8 to reset the watchdog timer during the sweep. Ordinarily, when the
watchdog timer expires, the PLC shuts down without warning. SVCREQ 8 allows the
timer to keep going during a time-consuming task (for example, while waiting for a
response from a communications line).
Caution

11.9.1 Parameter Block Format for SVCREQ 8

This function has no associated parameter block.

11.9.2 Example of SVCREQ 8

In this example, power flow through enabling output %Q0027 or input %I1476 or internal
coil %M00010 causes the watchdog timer to be reset.
%Q0127
%I1476
%M0010
Be sure that resetting the watchdog timer does not
adversely affect the controlled process.
SVC_
REQ
VersaMax PLC User Manual