This meant the MicroLogix 1000 could respond to read and write commands from other devices, but it couldn’t initiate a request. Initially it only supported the DF1 Protocol, and was limited to respond only mode. The MicroLogix 1000 includes a single serial port, Com 1, for communications. With the SLC-500 I/O modules, you had to choose either sinking or sourcing. On the plus side, the unit programmed with the same software as the SLC-500 series. Allen-Bradley also released a low cost Hand Held Programming Terminal and DOS based programming software for the MicroLogix 1000.Īnother advantage of the MicroLogix was the DC Input models supported either sinking or sourcing inputs. And, unlike the Fixed SLC-500 controllers (and the SLC-100/150 before it,) the MicroLogix 1000 was not expandable. However, the MicroLogix 1000 initially only came in two versions: 16 I/O and 32 I/O. Seen as a replacement for the bulky SLC-500 Fixed unit, the MicroLogix 1000 was substantially smaller and less expensive. Launched in 1994, the MicroLogix 1000 was the first Micro PLC released from Allen-Bradley. UPDATE: Rockwell discontinued the MicroLogix 1000 in June of 2017.
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