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Hopper Loaders with/without Sight Glasses 38
Chapter 5: Restoring a Lost or Corrupt
Program
5-1 Corrective Maintenance
PLC Memory Module
A PLC memory module (ACS Part# A0567138) loaded with the appropriate program for the
system purchased is provided as both a backup in the event of a catastrophic failure and as a
means to upgrade the PLC program.
Depending on the system purchased, the memory module will contain:
1. A0573702 VTC 2/20 AC Inputs
2. A0573712 VTC 2/20 DC Inputs
In the event that the PLC memory becomes corrupted, the memory module can be used to
reload the PLC program with factory default values. The red FAULT indicator on the PLC
indicates a problem with the PLC memory or an error in the internal settings and may be
flashing or on steady. Follow the procedures below to reload the PLC program.
1. Open the front cover of the PLC by pulling on the tab above the words “Allen-
Bradley” to expose the memory module socket. Refer to the diagram, item 7 shown
below.