Allen-Bradley MicroLogix 1200 Reference Manual page 135

Timer Accuracy
Timer accuracy refers to the length of time between the moment a timer
instruction is enabled and the moment the timed interval is complete.
Table 8.4 Timer Accuracy
Time Base
0.001 seconds
0.01 seconds
1.00 seconds
If your program scan can exceed 2.5 seconds, repeat the timer instruction
on a different rung (identical logic) in a different area of the ladder code
so that the rung is scanned within these limits.
Repeating Timer Instructions
Using the enable bit (EN) of a timer is an easy way to repeat its complex
conditional logic at another rung in your ladder program.
Timing could be inaccurate if Jump (JMP), Label (LBL),
NOTE
Jump to Subroutine (JSR), or Subroutine (SBR) instructions
skip over the rung containing a timer instruction while the
timer is timing. If the skip duration is within 2.5 seconds,
no time is lost; if the skip duration exceeds 2.5 seconds,
an undetectable timing error occurs. When using
subroutines, a timer must be scanned at least every 2.5
seconds to prevent a timing error.
Accuracy
-0.001 to 0.00
-0.01 to 0.00
-1.00 to 0.00
Timer and Counter Instructions
Publication 1762-RM001C-EN-P
8-3