Allen-Bradley MicroLogix 1400 - Page 6

Publication 1766-RM001A-EN-P - October 2008
6 Table of Contents
Programming Instructions
Overview
Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Using the Instruction Descriptions . . . . . . . . . . . . . . . . . . . . . 92
Chapter 5
Using the High-Speed
Counter and Programmable
Limit Switch
High-Speed Counter Overview . . . . . . . . . . . . . . . . . . . . . . . . 99
Programmable Limit Switch Overview. . . . . . . . . . . . . . . . . . . 99
High-Speed Counter (HSC) Function File . . . . . . . . . . . . . . . 100
High-Speed Counter Function File Sub-Elements Summary . . 102
HSC Function File Sub-Elements. . . . . . . . . . . . . . . . . . . . . . 103
HSL - High-Speed Counter Load . . . . . . . . . . . . . . . . . . . . . . 130
RAC - Reset Accumulated Value . . . . . . . . . . . . . . . . . . . . . . 131
Programmable Limit Switch (PLS) File. . . . . . . . . . . . . . . . . . 132
Chapter 6
Using High-Speed Outputs PTO - Pulse Train Output. . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Pulse Train Output Function. . . . . . . . . . . . . . . . . . . . . . . . . 139
Pulse Train Outputs (PTOX) Function File . . . . . . . . . . . . . . 143
Pulse Train Output Function File Sub-Elements Summary . . . 144
PWM - Pulse Width Modulation . . . . . . . . . . . . . . . . . . . . . . 158
PWM Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Pulse Width Modulation (PWMX) Function File. . . . . . . . . . . 159
Pulse Width Modulated Function File Elements Summary . . . 160
Chapter 7
Relay-Type (Bit) Instructions XIC - Examine if Closed
XIO - Examine if Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
OTE - Output Energize. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
OTL - Output Latch
OTU - Output Unlatch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
ONS - One Shot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
OSR - One Shot Rising
OSF - One Shot Falling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Chapter 8
Timer and Counter
Instructions
Timer Instructions Overview . . . . . . . . . . . . . . . . . . . . . . . . 175
TON - Timer, On-Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
TOF - Timer, Off-Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
RTO - Retentive Timer, On-Delay . . . . . . . . . . . . . . . . . . . . . 181
How Counters Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
CTU - Count Up
CTD - Count Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
RES - Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Chapter 9
Compare Instructions Using the Compare Instructions . . . . . . . . . . . . . . . . . . . . . . 190
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