dekor

Please check the voltage value Must be on corect range for "1" logical level

Great neews! Good for sharing your experience. dekor.

Hi Richard, what I learnt from Siemens forum, is that it is usefull to use positive edge for request instead of continous signal. That is also written on help of TIA (look to example from help, they also use positive edge) Related to error code, you need to catch them and send them on a memory where you will be able to read. What I suggest you for begining, is a program that will read a status from a coil at inverter. When the communication will be in good condition, then start with sending values and commands. Try to folow example from help. It was usefull for me. On attachment you will find a program that I wrote for PAC3100 and 1200 communicating on Modbus RTU. Also below are some links that I use to learn. If you consider, that I can respond to your questions, please ask me. https://support.industry.siemens.com/cs/document/47756141/how-do-you-establish-a-modbus-rtu-communication-with-step-7-%28tia-portal%29-for-the-simatic-s7-1200?dti=0&lc=en-WW http://www.modbus.pl/node/29 dekor. Sentron_v12_05_9_Good english.zip

Hi Richard Please, can you add a print screen for master that you describe, or attach your program. dekor. You don't use DB to read or write data? Related to error code returned, you need to capture them and store . I will check my program and I will try to comment for you.

Seems that there is no communication port set. Did you not wrote entire program that you have printed out? Looks that there are too many unused symbols... My laptop not display corect all text. dekor.

Hi, you can put on desk the old PLC and power on again? just for trial, to get original program. Can you upload somewhere the program that you wrote for new PLC? dekor.

Hi gdalianis, you don't have the back-up copy of initial PLC program? It was CPU protected or POU units protected? You delete the program from that CPU? if not, maybe you can get access to recover correct program. You wrote again entire PLC program according printout copy? When you compile program was ok? I guess is not a problem of CPU version, usually new version allow usage of new functions or resolve some bugs. What version of Microwin you use? dekor.

Hi Richard, I did few months ago a project for S7 1200 and other devices communicating on Modbus RTU. If you need some hints for Modbus RTU: 1. Configure the CPU and communication module - this is like Siemens help show. 2. Configure communication port - this is like Siemens help show. On S7 1200 Modbus RTU are only two actions read: "mode =0" and write: "mode =1". Siemens dont look to read bit or read word, just read. Dont look for write coil or write word, just write. 3. Read data that you need from VFD using function "mode 0" from adresses that you need - that was a bit unclear for me on help documents 4. When you need to send commands or values to VFD use function "mode 1" at adress you want to send - that was a bit unclear for me on help documents 5. Make sure that your command will not hang if the VFD will not respoond to command. If you need more info, ask for on forum. I teach myself and I want to share what I learn. If you need to simulate the data exchange, I suggest to use Modbus Poll and Modbus Slave from http://www.modbustools.com Success! dekor.

Andrzej, I have no clue for that... When you will find reason, please share your experience. dekor.

Hi, check also if the web server is activated.

Hi, do you want to check settings from attached pictures?

Hi, Have you set the CPU prperties like on description from page n-o.6? Have you add the tick mark on "Permit access with Put/Get communication partner"?

Hi Andrzej, Try to folow instructions from attached document.Siemens_S7_1200_Ethernet.pdf

Hello fofig, probably your computer use win7, then you will need STEP7-MicroWIN V4.0 SP9. dekor.

Hi, yes you need to configure PLC to act as Modbus Slave. It is easy.

Hi kijo Have you connect power supply to this module? Did you made hardware compilation? Is the module the same on project as on reality? Did you look for corect adress ? some time we forgot that the CPU end at input I1.5 and output at Q 1.1..... Let us know dekor.

Hi, have a look to next link: https://www.automation.siemens.com/WW/forum/guests/PostShow.aspx?PageIndex=1&PostID=163489&Language=en&onlyInternet=False#top dekor.

Dear friends, I intend to count how many times a binary tag from PLC is changing and to display counted value on WinCCFlexible runtime screen but without creating the counter in PLC program. Is it possible in WinCC Flexible? dekor.

Dear friends, I want to clarify that the "DEMO" software will not go on-line with real programmable relay. Will be OK for creating and simulating programs, but not for transfer or upload functions. dekor.

Hi, I would like to know answers for next questions: 1. Can you explain operating system that you use? Is listed as supported by Logo Soft Comfort ? 2. Is the LOGO module an old version? I remember the time when I meet similar situation: The software was OK, communication port OK, adapter for communication OK, but still without success. The old LOGO need to be put on transfer mode using local keyboard. Try this option too. I found a document that describe for you on page 156 how to go on transfer mode. Let us know your results. dekor. DSA00495739.pdf

Hi, my first idea is that you use a DEMO version. Are you sure that your software version is not a DEMO version? Give more details, print screen cut be also useful. dekor.

You have to read memory using ponyprog, and then, buy a new PLC, same model and version, and write the memory. Put all in back and create your back-up from new PLC.

Hi, try to generate de DB with correct definition, lenght, and populate them with initial values, using OB21 and OB22. dekor.

Hi, I meet a situation that I would like to solve with yours help. On recipe screen, I select a recipe to view the values for elements. Then I upload the values from PLC to see what are the actual values. On the name field remain the name of recipe that I viewed before. If I want to leave the page, then a message ask If I want to modify the recipe that I seen before. If I choose YES, then the recipe will get the values read from PLC. The machine operator sometime is not enough careful and damage the recipe. Can be that prevented in a way? I attach a screen shot for this message. dekor.

Hi Groo, thank you for your response. There are two dedicated screens. One for editing recipe and one for one for visualization of recipe. I have problems on recipe visualization scree. On the screen for recipe visualization is ask about saving ? Why? I consider that somewhere is a mistake. I understood something wrong about "edit recipe" screen and "view recipe" screen? No one else has an idea about mistake? dekor.