Allen-Bradley micrologix 1500 Reference Manual

Publication 1762-RM001C-EN-P
Relay-Type (Bit) Instructions 7-5
Addressing Modes and File Types can be used as shown in the following
table:
ONS - One Shot
Instruction Type: input
The ONS instruction is a retentive input instruction that triggers an event
to occur one time. After the false-to-true rung transition, the ONS
instruction remains true for one program scan. The output then turns OFF
and remains OFF until the logic preceding the ONS instruction is false
(this re-activates the ONS instruction).
ATTENTION
!
Under error conditions, physical outputs are turned off.
Once the error conditions are cleared, the controller
resumes operation using the data table value.
Table 7.7 OTL and OTU Instructions Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page4-2.
Parameter
Data Files
Function Files
(1)
(1) DAT files are valid for the MicroLogix 1500 only. PTO and PWM files are only recommended for use with MicroLogix
1200 and 1500 BXB units.
CS - Comms IOS - I/O DLS - Data Log
(2)
(2) The Data Log Status file can only be used by the MicroLogix 1500 1764-LRP Processor.
Address
Mode
(3)
(3) See Important note about indirect addressing.
Address
Level
O I S B T, C, R N ST L MG, PD RTC HSC PTO, PWM STI EII BHI MMI DAT TPI Immediate Direct Indirect Bit Word Long Word Element
Operand Bit •••••• ••••••• • • • ••
IMPORTANT
You cannot use indirect addressing with: S, ST, MG, PD,
RTC, HSC, PTO, PWM, STI, EII, BHI, MMI, DAT, TPI, CS,
IOS, and DLS files.
ONS
N7:1
0
Table 7.8 Execution Time for the ONS Instructions
Controller When Rung Is:
True False
MicroLogix 1200 2.6 µs 1.9 µs
MicroLogix 1500 2.2 µs 1.7 µs
NOTE
The ONS instruction for the MicroLogix 1200 and 1500
provides the same functionality as the OSR instruction for
the MicroLogix 1000 and SLC 500 controllers.

Allen-Bradley micrologix 1500 Specifications

General

Brand	Allen-Bradley
Model	micrologix 1500
Category	Controller
Language	English