欧姆龙PLC有很多不支持扩展的便宜PLC，微型PLC不自带24V直流输出，输入侧只能对接湿接点，单独使用的话比三菱麻烦多了，如果组一个系统则这一缺点不明显。欧姆龙也是以梯形图为主的，结构化文本比西门子的还低级，编程软件不太好用。但是欧姆龙PLC扩展模块的配置基本上也算简单，说明书嵌入在编程软件里，要自己找，用习惯了就容易找到，新手则无从下手。欧姆龙的型号较另外两者更不容易看懂一些，系列感觉有点太多了，也有很多是不可扩展的CPU模块，自成一些系列。
| 140CFE03200 | BMEH5820KD |
| 140CFG01600 | BMEH5840KA |
| 140CFH00800 | BMEH5840KD |
| 140CFI00800 | BMENOC0301 |
| 140CFI08000 | BMENOC0311 |
| 140CFJ00400 | BMENOC0321 |
| 140CFK00400 | BMXNGD0100 |
| 140CFU00600 | BMENOP0300 |
| 140CFU40000 | BMENOS0300 |
| 140CFX00110 | BMECXM0100 |
| 140CFX00210 | BMXRMS004GPF |
| 140CHS11000 | BMEP581020H |
| 140CHS32000 | BMEP582020H |
| 140CHS41020 | BMEP582040H |
| 140CPS11100 | BMEP585040C |
| 140CPS11400 | BMEP586040C |
| 140CPS11410 | BMEH582040C |
| 140CPS11420 | BMEH584040C |
| 140CPS12400 | BMEH586040C |
| 140CPS12420 | BMENOC0301C |
| 140CPS21100 | BMENOC0311C |
| 140CPS21400 | BMENOC0321C |
| 140CPS22400 | BMENOP0300C |
| 140CPS41400 | BMENOS0300C |
| 140CPS42400 | BMECXM0100H |
| 140CPU11302 | 140MSC10100 |
| 140CPU11303 | 140NOA61100 |
| 140CPU21304 | 140NOA61110 |
| 140CPU42401 | 140NOA62200 |
| 140CPU42402 | 140NOE21100 |
| 140CPU43412 | 140NOE21110 |
| 140CPU43412A | 140NOE25110 |
| 140CPU43412C | 140NOE77100 |
| 140CPU43412U | 140NOE77101 |
| 140CPU53414 | 140NOE77110 |
| 140CPU53414A | 140NOE77111 |
| 140CPU53414B | 140NOM21100 |
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| 1756-A10 | 1762-IA8 | 1763-BA |
| 1756-A13 | 1762-IF2OF2 | 1763-L16AWA |
| 1756-A17 | 1762-IF4 | 1763-L16BBB |
| 1756-A4 | 1762-IQ16 | 1763-L16BWA |
| 1756-A7 | 1762-IQ32T | 1763-L16DWD |
| 1756-BA1 | 1762-IQ8 | 1763-MM1 |
| 1756-BA2 | 1762-IQ8OW6 | 1763-NC01 |
| 1756-BATA | 1762-IR4 | 1766-L32AWA |
| 1756-BATM | 1762-IT4 | 1766-L32AWAA |
| 1756-CFM | 1762-L24AWA | 1766-L32BWA |
| 1756-CN2 | 1762-L24AWAR | 1766-L32BWAA |
| 1756-CN2R | 1762-L24BWA | 1766-L32BXB |
| 1756-CNB | 1762-L24BWAR | 1766-L32BXBA |
| 1756-CNBR | 1762-L24BXB | 1766-MM1 |
| 1756-CP3 | 1762-L24BXBR | 1768-CNB |
| 1756-CPR2 | 1762-L40AWA | 1768-CNBR |
| 1756-DH485 | 1762-L40AWAR | 1768-EN |
| 1756-DHRIO | 1762-L40BWA | 1768-EWEB |
| 1756-DNB | 1762-L40BWAR | 1768-KY1 |
| 1756-EN2F | 1762-L40BXB | 1768-L43 |
| 1756-EN2T | 1762-L40BXBR | 1768-L43S |
| 1756-EN | 1762-OA8 | 1768-L45 |
| 1756-EWEB | 1762-OB16 | 1768-L45S |
| 1756-HSC | 1762-OB32T | 1768-M04SE |
| 1756-HYD02 | 1762-OB8 | 1768-PA3 |
