Greg

Hi all, according to my last post http://forums.mrplc.com/index.php?showtopic=20555 i decided to change the 214 CPU into 226 CPU the PLC and it's modules(DO-222, and AI-231). i would like to know if there are any problem with transferring the program from the S7-214 CPU to S7-226 CPU? P.S i noticed that the 214 CPU is an AC/AC/AC and the Expansion module 222 DO as well AC output, and i couldn't find 226 CPU AC/AC/AC, the only options is DC/DC/DC or AC/DC/Relay, and is there Analog input on the 226 CPU? does it matter the type of the inputs/outputs, and how does it influence on the system? Thanks in advance, Best Regards, Greg.

Hi if you program with a laptop buy the USB cable, RS232 cannot be connected to laptop(at least i didn't succeed) Best Regards, Greg.

Thank you very much guys!

Hi Guys, my client ordered CP-243-1 IT(see below) module to get info from the system and send it to HMI for diagnostics. when i came to the client i saw a very big problem, the PLC that installed there is S7-214 series(as shown below) with different connectors to other modules(there are 2 more modules EM222 and EM231 with the same connection) that have been installed in the early 80's, i was talking with technical support Germany, and have been told that there is no option to combine that module to PLC. my question is there any convertor i could connect the TCP/IP port on the module to MPI port on the PLC(i need at least 2 MPI ports there is a TD panel connected), or the only option is to change the PLC system to newer one? Thank you all in advance. Best Regards, Greg.

Hi Cross, thanks, i was talking to technical support SIEMENS in Germany, they told me this module for the newer S7-22X(224 and newer), also they told me there is a convertor from TCP/IP to MPI but didn't remember (probably didn't want to) what model and which manufacture. my quest is there such convertor, the problem my client don't have a big budget for newer systems especially for S7-1200, i'm trying to find any other solution they would be pleased with it. help me figure it out, and if there is no such convertor let me know, please as soon as possible. Thank you all, Best Regards, Greg.

Good morning guys. iv got a mission to do next programming and not really succeed in this maybe some one could help me, in S7-200 PLC from SIEMENS i know when i put a Reset coil it sets the value of the same Output or bit to 0 iv tried the same in Twido and i noticed it activates the reset coil when the same bit set to 1. my requirement is to open/close on/off valves, 1 of the valves should be open every time, and when i choose another valve to be opened the previous should be closed. i try to do that with Reset coil to the bits that have been activated in the HMI, but as i see the reset coil activated when the same bit are activated and not when the logic expression are true, see below the example. thanks in advance hope some one could help and explain how does it work in this PLC. Best Regards, Greg.

Hi aggattapauer, forgot to attach the file... im programming in Ladder, in case iv got more than 2 valve lets say 5. im choosing first valve to be open for my process, after it done what it should do, i want to choose another one lets say 4th and in that same action i want the first valve to change its position to close position. i had an idea with "Reset coils" as shown in the attached file, but as i saw the logic expression to start the coil didnt influence the coil(%M0), but it's bit(%M0) it self(for example that bit get's it logic from HMI). lets forget about the valves, how does "Reset coil" works in twido? Best Regards, Greg.

Hi Greg, S7-200 programmed by microwin step7, and if you have programmed PLC's before its really not a problem 200 series very simple. about S7-300 a little bit more complicated but if you have experience with PLC's i think it wont be a problem. Best Regards, Greg :)

Thanks anyway!

Thanks alot!

Good morning SIEMENS specialist's. i would be very pleased if you could answer me few question, i'm learning about STEP7 and s7-300, s7-400 PLC's especially about protection and security. 1. is there function of encryption/time stamp/signature? 2. TELNET command? 3. Master/Multi code, if i lock the CPU or any other feature with password and i forget it, is there a Master code to unlock it or could siemens do that? 4. status bit, that tells me if there were changes in PLC's configuration or the Code? Thousands thanks in advance for you guys/girls, for you help. Best Regards, Greg.

CRC, you mean Cycling Redundancy Check that used in communication protocols? and how can i check and research it without connecting a real CPU(i dont have one right now). and possibility to send the alarm/report or whatever it could be to control room.

Thank you very much Jesper. you helped me a lot. Thousand thanks!

Hi to all, i would like to know if there is an option to disable or to lock with password the communication ports on S7-300 and S7-400 PLC's? Thanks in advance for looking and helping. Best Regards, Greg.

Anyone please!!!

Thank you Jesper, you say there is a possibility to disable the port completely, how or where i do that? Thank's in advance for you help Greg.

Thank you Jesper, actually there is an option in the Ethernet modules called symbols, its used to access variables of the cpu using a web browser and java applet, the CP must be aware of the names, addresses, and access rights of these variables. in the symbol list in this tab, you can see the currently known variables with their symbolic names, the corresponding addresses and the assigned access rights. try the help for more info. thank you anyway i made to find out how to define this option. Best Regards, Greg.

Hi to all you mates, im trying to define symbols for example to: CP 343-1 Advanced-IT, i cant figure out how i do it, or where i get those symbols from if someone can help me, i would be pleased. Thank you in advance. Best Regards, Greg.