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Advanced HMI is a powerful, adaptable HMI/SCADA (Supervisory Control and Data Acquisition) development package that takes advantage of Visual Studio. There is no coding required and you can simply drag and drop items onto the page. The best thing is that the software is free. We will look at using AdvancedHMI with the Omron CP1H PLC.
Our sample CP1H PLC program will use button and indicators to control a start/stop jog circuit. An analog input into the PLC will be scaled and displayed on a gauge on our AdvancedHMI screen. We will also write information to our 7 segment display on the CPU from our AdvancedHMI screen. This communication will be done using Omron serial host link protocol over a RS485 serial cable. The AdvancedHMI package will run on a windows PC and communicate out the port using a USB to RS485 adapter. Let’s get started. Continue Reading!
The data control instructions in the Omron CP1H programmable logic controller are used to manipulate the outputs based upon control conditions. Control is the main purpose of these instructions within the PLC. Instructions include PID (Proportional, Integral and Derivative), PID with Auto tuning, Dead Band Control, Limit, Dead Zone Control, Time Proportional Output, Scaling, etc.
We will be looking at some of these instructions in the Omron CP1H PLC. Examples of the instructions will be presented. Continue Reading!
The Omron CP1H programmable logic controller has several different table data processing instructions. These instructions are used to handle table data, stacks and other ranges of data.
We can define a stack of data. With this data we can then do the following: add new data by pushing onto the stack, use FIFO (First In First Out), use LIFO (Last In First Out), find the current stack size and read, overwrite, insert or delete from the stack.
Dimension record tables are used to define the length of each record and the number of records. We can then write and read these records. This is ideal for data acquisition projects.
Other instructions found in the table data processing instructions include searching, summing and finding minimum and maximum values.
We will be looking at these instructions in the Omron CP1H PLC. Examples of the instructions will be presented. Continue Reading!
The Omron CP1H programmable logic controller has several different ways to control the program and the way in which your program executes. Sequence control, Subroutines, and Step instructions can be used. These are just a few ways in which the controller will execute your logic using a synchronous PLC scan. Understanding the PLC program scan will explain the synchronous and asynchronous program scanning.
Interlocks, Jumps, For Next Loops, Subroutines and Step instructions are some of the ways in which we can control our program in the PLC. We will be looking at some of these instructions in the Omron CP1H PLC. Examples of some of the instructions will be presented. Continue Reading!
Previously we used VB6 (Visual Basic 6) to implement the Omron Host Link Protocol to communicate to our programmable logic controller. (PLC) In part 2 we used Visual Basic for Applications (VBA) to accomplish our host link serial communication. We will now look at using VB.Net to establish and retrieve information in and out of the PLC using host link. (C mode commands)
Hostlink communication protocol is a method developed by Omron for communication to PLC’s and other equipment. This ASCII based protocol is used over RS232 or RS422/RS485. It is a many to one implementation which means that you can communicate with up to 32 devices back to a master. (1:N) This communication on the industrial floor can control PLC’s, Temperature Controllers, Panel Meters, etc.
The Omron CP1H plc will be used with a CP1W-CIF11 (RS485) communication serial link adapter. We will also use a USB-485M Universal Serial Bus to RS485 adapter from automation direct. The video at the end of this post will demonstrate the communications by reading 10 registers form the DM area of the PLC. Continue Reading!
Programmable logic controller programming is all about manipulating the bits within the memory of the controller. Sometimes we need to convert from one form to another. This is where we will use data conversion instructions. BCD to Binary, Line to Column, Grey Scale and Multiplexing are just some of the data conversion instructions. We will be looking at some of these instructions in the Omron CP1H PLC. Examples of some of the instructions will be presented. Continue Reading!
Programmable logic controllers are not typically known for their math ability. Modern PLC controllers now come with several math instructions to expand the ability to perform math routines. Every controller has different methods to handle math with different numbering systems. Binary, BCD (Binary Coded Decimal) and floating point single and double are examples of some numbering systems. The following is a post on what everybody ought to know about PLC numbering systems. If you subscribe to our website you will get a free copy of the article on numbering systems which includes understanding floating point. You must refer to the programming manual of the controller that you are programming for specific math instruction information.
We will be looking at some of the math instructions in the Omron CP1H PLC. Examples of some of the instructions will be presented. Continue Reading!
PLC programming is all about how we can manipulate the information stored in the PLC. We have already looked at timers, counters, moves and comparison instructions. Data shifting is a different concept that will move bits and words around in memory. This is necessary usually for tracking purposes. The word or bit will represent product or information. As this information is triggered to shift to a new location we can use this to activate items latter in the process. A typical example of this would be parts on a conveyor belt. As the part is detected on one end it will turn on a bit in a register. The conveyor movement is usually picked put by an encoder and shifts this bit in the register in sync with the conveyor movement. At the other end of the conveyor belt we can see the bit position and do something with this information. We can use this information to count, reject etc. Looking at the entire register full of bits, we can determine everything on the conveyor and its position.
We will be looking at the data shifting instructions in the Omron CP1H PLC. Examples of some of the instructions will be presented. The instructions are used to shift data within or between words, but in different amounts and directions. Continue Reading!
Just about every program usually has some data comparison instruction. This is the ability to compare information from one area of the controller to another and act on results. The Omron CP1H series of programmable logic controllers provide several different ways to compare information. We will be looking at several different ways in which we can do this with some programming examples. Sometimes the instruction used for data comparison in the Omron CP1H will determine the kind of data that we are comparing. You must look at the individual instructions to determine if this is the case or not. Continue Reading!