Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 329)

After You’ve Entered Your Program
Chapter 18
18–8
Setting the Extended I/O Configuration Bit
When this bit is set to NO and unused outputs are written to, the controller
will fault. Therefore, this bit must be set to YES if writing to unused outputs.
(For a 16 I/O controller, O/6–O/15 are unused outputs. For a 32 I/O
controller, O/12–O/15 are unused outputs.)
Note: This selection is valid for Series A–C discrete only.
To change the bit setting:
1. Put the controller in RPRG mode (if it is not already in that mode).
2. Access the program configuration menu.
3. Arrow down to the option EXTEND IO CNFG and select it.
ENT
6 times
E X T E N D I O C N F G
Y E S N O
4. Select the option YES and return to the home screen.
ENT ESC ESC
5. You must accept your program edits for this change to take affect. For
information on accepting edits, see page 18–21.