There is also a feature, which I have not fully understood that enables the PLC to Automatically allot itself an IP address using BOOTHCP protocol. I could infact disconnect my PC's ethernet port and attach the PLC to my office network and have RS-Linx see it from anywhere else. If however you want to plug it into your LAN, ie. It is trivially simple to download an IP number and then use a crossed cable to directly hook up to your PC's ethernet port. The port in RS-232 mode is hardly useful, once you download the PLC's IP number. to ensure that D-comm mode is diabled and you use a separate cable for using the RS-485 signals. the RS-485 signals A (or Data-) & B(Data+) are found on pins 8 and 1 respectively. There is no need to use that Net AIC+ card. For using it on RS-485 I found the idea right here on MrPLC. There is no special cable made particularly for ML1100. The Pin-out of the cable for using it in RS232-mode is available right here at this site. There is no risk whatever in making your own cable. Just been using ML1100 today, and using all its features on the combo port. What's the catch ?" Rockwell: "We're not going to put the pinout in the installation brochure or in the User Manual. But you're going to need a breakout box type connector to bring the RS485 pins out to screw connectors." Customers: "That sounds really easy and straightforward. And the shell will be the same as all the other MicroLogix. You can still use the good old 1761-CBL-PM02 cable that we've been selling for fourteen years to do RS232 connections. We don't need the 24VDC accessory power because the new MicroLogix will have built-in RS485 and Ethernet, so the only accessory that you need power for is the 1761-NET-DNI and that's not as popular as the other two." Rockwell: "We can do that. Customers: "I don't want to buy that 1761-NET-AIC module anymore you need to build an isolated RS485 port into the next MicroLogix" Rockwell: "Well, OK, but we're either going to have to use a totally custom connector, or eliminate hardware handshaking and the +24VDC accessory power pin" Customers: "Use the same connector.
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