2014年3月31日 · Launched in 1994, the MicroLogix 1000 was the first Micro PLC released from Allen-Bradley. Seen as a replacement for the bulky SLC-500 Fixed unit, the MicroLogix 1000 was substantially smaller and less expensive. However, the MicroLogix 1000 initially only came in two versions: 16 I/O and 32 I/O.