Watch and Force Table in TIA Portal

Watch and Force Table in TIA Portal

Subscribe Watch Trailer Share
Watch and Force Table in TIA Portal
  • 209. How to Use the Watch Table in Your PLC Program

    There may come a time in your career when you are called to investigate a malfunction in an existing control system that someone else has written. The field device documentation may be scarce or even nonexistent and you don’t know what field device belongs to which address. You could press each s...

  • 210. How to Modify a Value in Your PLC Program

    In this lesson we are going to show you how to modify a value in the PLC. You are working on a new plant and you have a line of logic that is looking for a particular field device to be true before the logic will solve true but that field device isn’t yet installed. Let’s say that you need a valv...

  • 211. How to Modify an Input Value in Your PLC Program – Part 1

    In this lesson we are going to discuss a method to change the status of an input address. As we’ve discussed previously, the CPU first scans the inputs and puts the statuses or values within a memory area in the PLC. The scan then solves the logic based on the input statuses. And finally, the CPU...

  • 212. How to Modify an Input Value in Your PLC Program – Part 2

    In the previous lesson we refreshed your memory on a CPU scan cycle. We then discussed the basics for modifying the status of an input address. We also discussed the different options of modification. In this lesson we are going to discuss the modification option of “at the end of the scan cycle”...

  • 213. How to Modify an Output Value in Your PLC Program

    In the last few lessons we have been discussing how to modify the value of inputs. In this lesson, we are going to describe how to do the same for outputs. As you may recall, there are different modification selections and we will describe which one to select for the particular outcome you desi...

  • 214. Modifying a Value at Transition to Stop

    This lesson continues the discussion on how to modify the value of inputs and outputs. We are going to discuss the option of “at transition to stop”. As somewhat described by the name, this option will modify the value when the CPU transitions to stop mode. Let’s take a look at this lesson and se...

  • 215. What Are Test and Process Modes in TIA Portal

    In this lesson we are going to discuss two functions that may be accessible in the property selections of your CPU. Those functions are test mode and process mode. These functions allow you to test your program in different modes. The default mode, which is test mode, allows you to test your prog...

  • 216. Modifying Timer, Counter and Memory Bit Values in a PLC Program

    For several lessons now, we have been discussing different options for modifying input and output values during CPU scan cycles. In this lesson, we are going to show you how to modify the values of Timers, Counters, and memory bits. We will demonstrate why timer and counter values should use the ...

  • 217. How to Modify Byte, Word or Double Word Values

    This lesson is a continuation in our series of instruction on how to modify the values for inputs, outputs, timers and such during run-time of your PLC program. This lesson will offer instruction on how to modify the values for bytes, words, and double words. The process to modify these data type...

  • 218. Permissible Value Formats for the Watch Table

    This lesson continues the discussion on about modifying the values of various datatypes in a watch table. This lesson will discuss the different types of permissible values for the different datatypes that you may encounter within the watch table. We indicate to you how to pull up a helpful menu ...

  • 219. What is Forcing in PLC Programming?

    In several previous lessons we have been discussing modifying the values of various datatypes in a watch table. In this lesson we will introduce you to forcing. Forcing is similar to modifying with some subtle differences. One of those differences is when input or output addresses are forced, the...

  • 220. What Are the Differences Between Forcing and Modifying in PLC Programming

    In this lesson we will describe the difference between modifying addresses and forcing them. This lesson discusses what happens with either of these functions when the PLC power is turned off or when you are connected with your computer and you disconnect. The force function has an external indic...

  • 221. What is Peripheral Input in Siemens S7 PLCs? Part 1

    In previous lessons we have discussed the Process Image Input or PII and its purpose. In this lesson we discuss the size of the PII and what will be required of you to know, as the programmer, when it comes to being able to access your I/O when the boundary of the PII is exceeded. Each PLC has a ...

  • 222. What is Peripheral Input in Siemens S7 PLCs Part 2

    In the previous lesson we discussed the Process Image Input or PII and its size. We wrote a simple move instruction to access an analog input only to find that just as soon as we downloaded it to the PLC, the PLC faulted and went into stop mode. In this lesson we will discuss the PII further and ...

  • 223. Can I Use the PII for Peripheral Inputs While Writing a PLC program

    In previous lessons we discussed the Process Image Input or PII, its purpose, size, and what happens when exceeded. We wrote a simple move instruction to demonstrate the PII boundary and faulted the PLC, diagnosed that fault, and found out how we need to handle our I/O when our PII boundary is ex...

  • 224. What is Peripheral Output in Siemens S7 PLCs

    For the last few lessons we have been discussing the Process Image Input or PII and using it within your PLC programs. We are continuing to educate on this topic by discussing the Process Image Output or PIQ. Just as we instructed previously the purpose, size, and boundary, we will inform the sam...

  • 225. Can I Force Peripheral Inputs and Outputs in a PLC

    In a continuation of our discussions about the Process Image Input or PII and the Process Image Output or PIQ, this lesson is going to inform about the ability to force these peripheral objects. Previously we had opened a table to facilitate our testing and in this lesson, we’ll expand the table ...