Section 3
3.7.3 Furnace Program Data is Frozen and/or Operator Unable to log on:
When the PC and the Opto22 PLC are not communicating (as is often the case when the furnace has been
shutdown with the PC still running) the furnace program may appear to have data with some of the features
appear disabled. However, the data on the screen is not current and the operator must log-in again after
communication is established. Common conditions and resolutions are listed below. To troubleshoot,
follow all suggestions sequentially to determine cause of problem.
Remember: Always wait 1-2 minutes between each step to allow the PLC, Windows® and the
furnace program to properly clear and re-sync.
1) The PLC control system does not have power
Additional Indications: “A network cable is unplugged” message. Lights on the PLC are all off.
a.
Check fuse “FB” in safety enclosure box. (Ref: Power Control Schematic in Section 6)
the OPTO22 controller at the back of the PC and
2) The
Add
b.
Check the Ethernet cable between the PC and
at the controller. (Ref: Frame Wiring Schematic in Documentation Section)
c.
Check the setup of the installed Ethernet card. (Ref: Section 3)
d.
After any of the above is corrected, start PLC, start Furnace and then start furnace program. If
problem persists, proceed to 2)
PC is out of sync with the Opto22 PLC control system
itional Indications: Event log may indicate Controller Strategy Time/Date Incompatible.
Figure 3.7.1 Event Log - Time/Date Incompatible Message
a) Make sure Furnace Power is ON. Close Furnace program and reopen and wait 2 minutes for
the program to re-in
b) If the program fails to initialize, close the furnace program again, cycle the Furnace Power OFF
3) The
Addition
itialize.
and ON (wait 1-2 minutes between states). Reopen the Furnace program and wait 2 minutes
for the program to initialize.
PC and Controller Strategy Time/Date are out of sync
al Indications: Event log may indicate Controller Strategy Time/Date Incompatible.
3-10
LA-309 Owner’s Manual
Содержание LA-309
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