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I am hooking an EZtouchplc to a Phoenix Contact Modbus RTU bus terminator. The EZtouchplc is a 4 wire device and the PhoenixContact is a 2 wire device. When I use a 2-wire to 4-wire converter the link works and updates the i/o OK.
I wanted to eliminate the 2 to 4-wire converter since its on a continually moving device. I saw on the modbus site that you can make a 4 wire a 2 wire by tying the +'s together and the -'s. So T+ and R+ are tied together and R- and T- are tied together. I also incorporated 120 ohm resistors to eliminate echo. When I hook up this way the light start blinking like the link is working but the inputs do not update on the other end. Looking at the Modbus PLC block status it shows no errors.
Anyone know what's going on here?
I wanted to eliminate the 2 to 4-wire converter since its on a continually moving device. I saw on the modbus site that you can make a 4 wire a 2 wire by tying the +'s together and the -'s. So T+ and R+ are tied together and R- and T- are tied together. I also incorporated 120 ohm resistors to eliminate echo. When I hook up this way the light start blinking like the link is working but the inputs do not update on the other end. Looking at the Modbus PLC block status it shows no errors.
Anyone know what's going on here?