8 pin connector round12/24/2023 ![]() ![]() While they are all modes of transportation, they all serve different purposes. You may as well ask why I have a 2012 Prius, a 1994 Surburban 1500, a lawn tractor, and a jet-ski. You may as well complain that you need different programming packages for each processor platform Why isn't everything still based on the Modicon 084? Or the attempts of AB with the PDQ 2 or the PMC? If that was good enough in the late 60's early 70's, why isn't it good enough now? Would you even consider flashing a ControlLogix processor over a 19.2 kBaud serial connection? I know I wouldn't, unless I wanted a shiny new brick. ![]() ![]() Technology moves on, and maintaining backwards compatibility on a hardware level is very near insane. RIO was designed primarily to handle exactly that, Remote I/O, in the most efficient way possible, with the least processor overhead.ĭH+ can handle remote I/O, but it is designed more to talk directly to the PLC processor, and HMI interfaces, whether they be the old single line message displays, or full blown PC Based HMI's.Įthernet was just showing up when the PLC-5's ruled, and the original PLC-5 Ethernet connection was the AUI port that required an interface to either twisted pair (8P8C, NOT RJ45) or coax (10baseT, 10base2, or 10base5). 4 wire, and are limited in the number of drops/distances, and speed. RS-485 type communications are, but then you still have the issue of 2 wire vs. RS-232 Serial arguably "Could" be the standard, but it is not compatible with multi-drop installations. Why couldn't they have designed all of their devices to use the same comms protocol, interface hardware, plug style, and pinout? Going back to day one of the desgins of these devices, is there really any good reason why the design team chose to make the devices in such a way that can't be compatible? Don't you think they could have made them compatible if they wanted to?Ĭould they? Sure, but there are limitations. I just don't think that answer is good enough (coming from Allen Bradley, not Ken - I appreciate Ken's answer). ![]()
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