gongue2005

hi all, I managed to stabilize the 9 PSTX by installing 3 RS485 ports on a V1040 connecting 3 soft start on each port. They worked very well until I change the screen. the last 3 slaves of each network are going to fail. it seems that the processor stops the ports momentarily when it loads the new screen. What do you think of this?

So is this problem. I could not with more than 3 slaves. The ABB representative in Mexico could only handle 4 slaves. (after 4 weeks of research) and with direct technical support from ABB Sweden.

Thanks for your help, I posted my problem in the visilogic forum where I have 9 modbus rs485 slaves and with only one port I was able to convincingly connect up to 3 slaves. each slave has a timeout of 100 millisec to go to network failure. the data exchange is to force 5 coils and read 11 coils each. (in less than 100 millisec) so when I connect the 4th slave, it goes to failure for more than 100 millisec. (manufacturer's fixed value) softstart PSTX ABB. with your answer I can think that each port works with 2-3 slaves. but there is another problem with unistream that in the configuration sheet, you can not decrease the speed of penny popping at less than 100 millisec. I have added my code developed with visiligic. I'm still not happy with this work, I think I lack knowledge to have a fast 485 network (with 9 slaves) I forget to say that slaves have only 19200 bps. 3 Vision 6 esclavos pstx.vlp

Thanks for your help, I posted my problem in the visilogic forum where I have 9 modbus rs485 slaves and with only one port I was able to convincingly connect up to 3 slaves. each slave has a timeout of 100 millisec to go to network failure. the data exchange is to force 5 coils and read 11 coils each. (in less than 100 millisec) so when I connect the 4th slave, it goes to failure for more than 100 millisec. (manufacturer's fixed value) softstart PSTX ABB. with your answer I can think that each port works with 2-3 slaves. but there is another problem with unistream that in the configuration sheet, you can not decrease the speed of penny popping at less than 100 millisec. I have added my code developed with visiligic. I'm still not happy with this work, I think I lack knowledge to have a fast 485 network (with 9 slaves) I forget to say that slaves have only 19200 bps.

I look for the solution in either of them. with unistream it is not capable of polearning less than 100 millisec. the slaves are PSTX ABB sofstarters with native modbus rtu port that only has two values 9600 and 19200 bps. You have to force 5 coils by FC # 1 and read 11 FC # 15 coils. I have put the time out in 7 (70miliseg) and D # 1 retries in the modbus configurator and with a sequential drum active 3 MB every 70 millisec and works well with up to 3 slaves. no more. I must repeat that the slaves have a communication failure function that is activated if there is no data exchange in 100 millisec (fixed value) already this week it occurred to me to use a V1040 with 3 RS485 ports and each one connects to 3 slaves achieving a possible solution. Unistream was limited to not being able to have more serial ports (I do not know) and not being able to power less than 100 millisec. (or if?) something interesting that you do, is that if you look within 70 millisec of the requests, the same MB makes two requests, one on the positive pulse and one on the negative (trying to optimize the time of intervention with the slave). I annex my development for your criticism. I am not happy with this solution, I am very lacking in knowledge. 3 Vision 6 esclavos pstx.vlp

In UniStream, how many 485 Serial ports can you be installed? I thank you for your help

Hello everyone, I need an example of how to make a master and several (8) slaves by modbus RTU RS485, please, my knowledge does not work. the slaves are soft starters and only allow 100 milliseg fixed I'm using visilogic v9 ... and probe with unilogic but the minimum time is 100 millisec, with one slave works perfectly but with two no longer. I am desperate, anticipated thanks for your help.to not create error in the network. I am desperate, anticipated thanks for your help.

I have a problem, when a slave is disconnected (without opening the trunk network) all other slaves lose the communication of the master. Does anyone have the method or solution of how to do it?