Publication 1747-RM001G-EN-P - November 2008
2-12 Basic Instructions
Using Status Bits
When the processor changes from the REM Run or REM Test mode to the
REM Program or REM Fault mode, or user power is lost while the timer is
timing but not yet at the preset value, the following occurs.
• Timer Enable (EN) bit remains set
• Timer Timing (TT) bit remains set
• Accumulated value (ACC) remains the same
On returning to the REM Run or REM Test mode or when power is restored,
the following can happen.
Table 2.8 Setting RTO Status Bits
This Bit Is Set When And Remains Set Until
One of the Following
Timer Done Bit DN (Bit 13) accumulated value is equal
to or greater than the preset
value
the appropriate RES
instruction is enabled
Timer Timing Bit TT (Bit 14) rung conditions are true and
the accumulated value is
less than the preset value
Rung conditions go false or
when the done bit is set
Timer Enable Bit EN (Bit 15) rung conditions are true rung conditions go false or
if the timer is reset with the
RES instruction
TIP
To reset the retentive timer’s accumulated value and
status bits after the RTO rung goes false, you must
program a reset (RES) instruction with the same
address in another rung.
Table 2.9 Returning to REM Run or REM Test Mode
Condition Results
If the rung is true: TT bit remains set.
EN bit remains set.
ACC value remains the same and resumes incrementing.
If the rung is false: TT bit is reset.
DN bit remains in its last state.
EN bit is reset.
ACC value remains in its last state.
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