Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
264 Using Interrupts
STS - Selectable Timed
Start
Instruction Type: output
The STS instruction can be used to start and stop the STI function or to
change the time interval between STI user interrupts. The STI instruction
has one operand:
• Time - This is the amount of time (in milliseconds) which must
expire prior to executing the selectable timed user interrupt. A value
of zero disables the STI function. The time range is from 0 to 65,535
milliseconds.
The STS instruction applies the specified set point to the STI function as
follows:
• If a zero set point is specified, the STI is disabled and STI:0/TIE is
cleared (0).
• If the STI is disabled (not timing) and a value greater than 0 is
entered into the set point, the STI starts timing to the new set point
and STI:0/TIE is set (1).
• If the STI is currently timing and the set point is changed, the new
setting takes effect immediately and the STI continues to time until it
reaches the new set point.
Note that if the new setting is less than the current accumulated
time, the STI times-out immediately. For example, if the STI has
been timing for 15 microseconds, and the STI set point is changed
from 20 microseconds to 10 microseconds, an STI user interrupt
occurs at the next start-of-rung.
Addressing Modes and File Types can be used as shown below:
STS
Selectable Timed Start
Time 1
STS
Execution Time for the STS Instruction
Controller When Rung Is:
True False
MicroLogix 1100 27.18 μs 0.84 μs
STS Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 82.
Parameter
Data Files Function Files
CS - Comms IOS - I/O DLS - Data Log
Address
(1)
Mode
Address Level
O I S B T, C, R N F ST L MG, PD RI/RIX PLS RTC HSC PTO, PWM STI EII BHI MMI LCD Immediate Direct Indirect Element Bit Word Long Word
Time • • • • • • • • ••
(1) See Important note about indirect addressing.
IMPORTANT
You cannot use indirect addressing with: S, ST, MG, PD,
RTC, HSC, PTO, PWM, STI, EII, BHI, MMI, CS, IOS, and
DLS files.
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Allen-Bradley MicroLogix 1100 Specifications

General

Processor	32-bit
Programming Software	RSLogix 500
Mounting	DIN rail or panel mount
Power Supply	24V DC
Type	Compact PLC
Digital Inputs	12
Digital Outputs	8
Analog Inputs	4 (depending on model)
Analog Outputs	Optional with expansion module
Programming Language	Ladder Logic
Operating Temperature	0 to 55 °C (32 to 131 °F)
Series	MicroLogix