The 1785-L60L is a member of the PLC-5 controller series. This programmable controller can function as a central part of any control system based on the PLC PLC-5 series. The 1785-L60L is the central point that interconnects local, extended, and remote I/O modules on different types of communication interfaces, and which acts as the backbone of the control system. The 1785-L60L controller has three integrated communication interfaces marked as Channel 1A, Channel 1B, and Channel 2. Channel 1A and Channel 1B can function as remote I/O scanners, remote I/O adapters, or as DH+ communication interfaces. The third communication interface on the 1785-L60L, Channel 2, is an extended-local I/O port. The 1785-L60L controller has a 25-pin connector marked as Channel 0 on the front panel. Channel 0 is an optically-isolated EIA RS232C port, which supports ASCII and DF1 full-duplex and half-duplex master protocols as well as half-duplex slave protocols. Channel 0 has a green light for indicating the status of the communication interface. In addition, there is one 8-pin mini DIN connector marked as Channel 1A, which is a DH+ programming terminal connection parallel to Channel 1A. Two three-pin connectors are on a lower part of the front panel. These connectors are for Channels 1A and 1B, and these two communication ports can function as remote I/O scanners, remote I/O adapters, or as DH+ communication ports. On the 1785-L60L’s front panel, there is special connector marked as Channel 2, which is for an extended local I/O contact.
