STARTUP / TROUBLESHOOTING
5-7
Hardware and Installation User Manual
5.2.2.6
AUX Function 10 (Power-up Restart)
AUX Function 10 clears all discrete and non-retentive control relay image
registers except those elements that are forced. Other results of AUX Function
10 depend on the following conditions:
If the battery is low, AUX Function 10 clears the RLL program, I/O
configuration, retentive control relays, WXs, WYs, forced I/O,
V memory, and all timer, counter, and drum preset/current values.
If the battery is low and a program is in RAM, AUX Function 10 puts
the PLC in PROGRAM mode. If the battery is low and an
EPROM/EEPROM with a valid program is installed, AUX Function
10 puts the PLC in RUN mode.
AUX Function 10 downloads presets in either of the following
situations: (a) the battery is good and the download select switch is
set, or (b) the battery is low and a program is in EPROM/EEPROM.
AUX Function 10 also puts the PLC in PROGRAM mode if (a) the
battery is good and a fatal error is present or (b) the battery is good with
no error and the previous mode was PROGRAM.
Table 5-2 lists the effects on memory locations when AUX Functions 10, 11, and
12 are executed.
Table 5-2
Effects of Aux Functions on Memory
Locations
Operation
Selected
Discrete
Word
Image
Register
Control Relay
Retentive
Non–Retentive
TMR/CTR
DRUM
Presets
Forced
I/O
AUX 10
Cleared
Note 1
Cleared
Note 2
Note 1
AUX 11
Cleared
Cleared
No
Change
No
Change
No
Change
AUX 12
Cleared
Cleared
Download
No
Change
Cleared
Input
Cleared
Cleared
Cleared
Output
Note 1
Input
Note 1
Cleared
Output
Cleared
No
Change
No
Change
Note 1 No change if the battery is good; otherwise, cleared.
Note 2 Dependent on user-selectable switch, memory type, and battery condition.
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