ControlLogix


ControlLogix GSV Command (WallClockTime) 11

Intdoduction to ControlLogix GSV Command (WallClockTime) In this post, we will discuss the ControlLogix GSV Command (WallClockTime).  Earlier processors, such as the SLC-500 and PLC-5 had a data file dedicated to system status (S2).   In the S2 file, you could find the data table addresses of system information such as the Read More »

Set Date Time

ControlLogix Compare Instructions

Introduction to ControlLogix Compare Instructions ControlLogix Compare Instructions are generally used with analog values to determine if a tag is above, below, or within a preset range.   Examples of where a compare instruction might be used is if a tank level exceeds a certain preset.  Also, if a sump Read More »

Less than Greater than

ControlLogix Analog 3

Introduction to ControlLogix Analog Discrete (digital) inputs and outputs are signals that are on or off.   There is no middle state to discrete.  These were good for switches, indicator lights, or motor starters, but if we want to measure a variable signal, we need an analog module.     Read More »

IE8 Properties

ControlLogix Counters (CTU and CTD) 1

Introduction to ControlLogix Counters (CTU and CTD) We use ControlLogix Counters (CTU and CTD) to count transitions of a rung.   More specifically, to count the false to true transition of a rung.   We can use this to count pallets on a conveyor using a photo eye or proximity switch. Read More »

PIzza Count

ControlLogix Timers 2

Introduction to ControlLogix Timers ControlLogix timers are used to delay events, or to time events.    There are three timers in the ControlLogix processor.  The TON (Timer On Delay) delays an event from turning on.   Next, the TOF (Timer Off Delay) Delays an event from shutting off.  Then we Read More »

TOF Timeout

Interlock Bits

Introduction to Interlock Bits (Internal Bits) If you are not familiar with basic instructions yet, please visit the post on how basic logic works. Interlock bits are tags in the processor that represent the fact that a certain condition has been made.   For example:  If all guard gates are Read More »

Pumps Running

One Shot Instruction 2

Introduction to the One Shot Instruction (ONS) The ONS instruction is used to trigger an event.   It allows logical continuity for one scan when the instruction is true.   After this, the instruction goes false until it is shut off (reset). The ONS instruction is commonly used with Latch/Unlatch Read More »


Seal Circuits 1

Introduction to Seal Circuits Seals and latches allow you to momentary press a button to energize an output.   The output stays on until you press another button to shut the output off.    There are some dangers associated with the latches that we will also discuss.  If you are Read More »

SealFeatured

Basic ControlLogix Instructions

Introduction to Basic ControlLogix Instructions An easy way to learn Basic ControlLogix Instructions is to understand how to convert logic to English.    Before we do this, we need to understand three basic instructions:  XIC, XIO, and OTE. The XIC (Examine if Closed, or Examine On) instruction can look at any Read More »

Featured Image

ControlFlash 1

Introduction to ControlFlash ControlFlash is a firmware update utility.   When replacing modules in a ControlLogix system, the program is configured to look for a specific revision of a module.   When you replace a module, you may need to use ControlFlash to update the module’s firmware.    The firmware Read More »

ControlFlash Success