Vision & Samba PLC + HMI Controllers & VisiLogic Software
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Here! I am using COM1 for Modbus, and COM2 is unused at the moment (no serial port card) but I've initialized it. So, I connect a RJ11 (6P6C) cable to a SUB-D9 adapter and then to a USB-to-Serial adapter and to PC. This works because Vision serial ports enable RS-232 signals even if port is initialized in software as RS-485. On the PC I use these two software to test out the Modbus: 1. Modbus Slave by Witte Software 2. pyModSlave - free They both work fine, and I've been able to simulate Modbus traffic over COM2 and TCP/IP, with my PC acting as a slave device. -
Hi; As a note : Take all Grounds to 1 Point( localized area) as Kratmel illustrates. Do not Daisy Chain them. The noise just gets amplified as each ground is added ( more resistance) to the daisy chain, and can find a new less resistive route route( maybe thru the device) along its way. A single point ground will greatly reduce the chances of these electrons going back thru devices. They want to get "home " the easy way, less resistance the better. Milli Ohms do add up -- to trouble. DanT -
I am going to necro this thread being I am starting to have this issue. Currently using 1.33.210 and 1.33.273. In six months had 6 cpu errors in various places. All we been doing is sending a replacement cpu and then it works. So what could be causing this issue? -
Please check port1 1-6 pin PLC inside connector. Please post foto from PLC Info Mode about port1 configuration. -
By Ivan Ristic · Posted
Thank you for help. I will reroute IO modules "FG" wires tomorrow and test. I also use left side channel for most VFD power wires but there is couple of drives supplied from the right side channel. Signal and control wires are in the right channel but there is also in the left. I mixed them because of space which probably make problem with noise coupling. I will try to separate them as much as possible and see if this fix the problem. Regarding ferrite beads (rings), maybe this can help but I can not get them soon. I could also try to install metal plate between drives and upper part with IO modules as proposed by @Gabriel Franco just I am not sure how to install it? At the end, I could change switching frequency of the drives. Now is 8 KHz if I remember correctly. I can put it to 6 or 4 KHz if this could help? Tommorow I will test this things and see what happens. Thank you again for help.
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