This 1785-L60L is a member of the PLC-5 controller family. The programmable controller can be used as a core part of any control system and is based on the Allen-Bradley PLC-5 series. The 1785-L60L is the central point for connecting local, extended, and remote I/O modules on different types of communication interfaces, acting as the hub of the control system. This 1785-L60L controller has three integrated communication interfaces labeled as Channel 1A, Channel 1B, and Channel 2.
Channels 1A and 1B can be used as remote I/O scanners, remote I/O adapters, or DH+ communication interfaces. The third communication port on 1785-L60L channel 2 is an extended local I/O port. The 1785-L60L controller has a 25-pin connector labeled Channel 0 on the front panel. Channel 0 is an optically isolated EIA RS232C port that supports ASCII and DF1 full duplex and half duplex master protocols and half duplex slave protocols.
Channel 0 has a green light that indicates the status of the communication interface. In addition, there is an 8-pin mini DIN connector labeled Channel 1A, which is a DH+ programming terminal connection parallel to channel 1A. Two three-pin connectors are located on the lower part of the front panel. These connectors are used for channels 1A and 1B, communication ports that can be used as remote I/O scanners, remote I/O adapters, or DH+ communication ports. The 1785 L60L front panel had a special connector labeled Channel 2 for extended local I/O contacts.
Remote I/O scanner mode reads and writes I/O information between the controller and the remote I/O device. When used as an I/O scanner, this 1785-L60L is the management controller for other controllers in adapter mode and other remote I/O adapters. When channel 1A or channel 1B is configured as a remote I/O adapter, controller 1785-L60L manages controller-resident I/O while communicating with the management controller over a remote I/O link.