In North America, A-B has about a 30% market share, Siemens and Modicon (Schneider) about 25% each, all others combined, about 20%. Worldwide, Siemens is at about 40%, Omron about 20%, all others split the remaining 40%, with A-B amounting to only about 2%. If you are only going to take time to learn one, since you are in N. America I suggest A-B, but not the SLC500 because that is being phased out now. Learn the Control Logix. If you want to work for an OEM selling worldwide, learn the Siemens Step-7.
