Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
186 Timer and Counter Instructions
RES - Reset
Instruction Type: output
The RES instruction resets timers, counters, and control elements. When
the RES instruction is executed, it resets the data defined by the RES
instruction.
The RES instruction has no effect when the rung state is false. The
following table shows which elements are modified:
Addressing Modes and File Types can be used as shown in the following
table:
RES
R6:0
Execution Time for the RES Instructions
Controller When Rung Is:
True False
MicroLogix 1400 0.6320 µs 0.4305 µs
RES Instruction Operation
When using a RES instruction with a:
Timer Element Counter Element Control Element
The controller resets the:
ACC value to 0
DN bit
TT bit
EN bit
The controller resets the:
ACC value to 0
OV bit
UN bit
DN bit
CU bit
CD bit
The controller resets the:
POS value to 0
EN bit
EU bit
DN bit
EM bit
ER bit
UL bit
ATTENTION
Because the RES instruction resets the accumulated value and status bits,
do not use the RES instruction to reset a timer address used in a TOF
instruction. If the TOF accumulated value and status bits are reset,
unpredictable machine operation or injury to personnel may occur.
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Allen-Bradley MicroLogix 1400 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1400
Category	Controller
Language	English