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Messages - snaggletto

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General Mach Discussion / Re: Mach 3/4 and modbus PLC
« on: May 31, 2006, 10:38:53 PM »
I know that there is supposed to be an end rung at the end of a program.  Does there HAVE to be a program loaded on the PLC to simply connect to it via modbus?

   More specificly, does there have to be program that enables modbus communications and configures the IO points to modbus addresses (beyond simply configuring port 2 for modbus)?

If so, am I supposed to use RX and WX read/write from network instructions in this program?

Art doesn't know about this stuff, and PLC guys don't know about Mach, and there is SQUAT for documentation.  I have to get this running.  I appreciate your help in pointing me in the right direction.

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General Mach Discussion / Mach 3/4 and modbus PLC
« on: May 31, 2006, 05:59:17 PM »
Hello,
   I'm trying to get a modbus connection between my PLC (DL205 w/ D2-250 CPU) and Mach4.  I've got a cable made and it's tested good.  I've got the PLC's port 2 setup for modbus.  In the Mach modbus configuration I keep getting "timeout" responses from the PLC. 

   Art mentioned having to have a special program running on the PLC to setup modbus addresses for IO points.  I need help, I'm so out of ideas...  Thanks.

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