Rockwell Automation 1772-LV,D17726.6.1 A and I MNL MINI-PLC-2/15 PROCESSO - Manual (Page 68)

System Start-Up
Chapter 4
4Ć8
WARNING: Never reach into a machine to actuate a switch
because unexpected machine motion could occur and cause
injury to personnel. Do not use a metal rod since this could
result in an electrical shock if it touches and exposed terminal.
Instead, use a wooden stick or other nonconductive device to
activate the switch.
If the output device fails to operate, check to see if the Output Module indicator
is ON for the corresponding output terminal. If the indicator is ON, the output
device or its wiring is faulty. If the indicator is OFF, the program may be
incorrect.
8. Repeat steps 5, 6 and 7 until all outputs from the list are tested.
CAUTION: As additional devices are enabled, be alert to
improper mechanical interaction between output devices. For
example, a program may erroneously be causing motors or
clutches for both forward and reverse motion to be ON at the same
time. Remove power immediately if this situation occurs.
9. Plan the safest possible order in which the remaining output devices can be
reconnected for full operation. These are the ones not listed in Step 4.
These will be the more difficult output devices to check out than those that
cannot be independently tested. The machine motion should be enabled as
gradually as possible thereby allowing any problems to be detected as
early as possible under the most controlled conditions practical. After
each group of output devices is selected, repeat Steps 6 and 7. As these
output devices are reconnected for full operation, a record of progress
should be kept so that no confusion will exist as to what has been actually
checked out.
User Program Storage
After the entire system has been checked out, it is recommended that a copy of
the program be made with the optional Digital Cassette Recorder (Cat. No.
1770– SA) or the Data Cartridge Recorder (Cat. No. 1770–SB). Refer to their
User’s Manuals for recording the program on magnetic tape. A ladder diagram
dump or total memory dump will also be useful for documenting the program.
The user may also want to use an EPROM (Cat. No. 1770–XP) for a
non–volatile memory backup system. The EPROM is programmed while
installed in the Processor using the Power Supply Assembly (Cat. No. 1772–PA
or –PAA). During the programming process, the Processor’s RAM memory is
duplicated and transferred to the EPROM.