1771-PM

The Allen-Bradley 1771-PM is a microprocessor-based clutch/brake device. It is an essential component in building a clutch/brake controller and press system for use with a PLC Programmable Controller that has 1771 Remote I/O Operation. It generates three types of 8-bit binary fault codes including trip-condition messages, latched messages, and non-latched messages. The clutch/brake module can communicate with the programmable controller at 57.6k baud within a maximum distance of 10,000 cable feet. The 1771-PM Clutch/Brake Module is mainly used for monitoring and controlling the mechanical power press using a standard algorithm. Two of these modules, operating in parallel, are required to provide press control from the remote I/O chassis. Each of the paralleled devices monitors its own I/O and compares input conditions with the other module. Both modules must be receiving identical input conditions. Any mismatch stops press motion. The module then transmits a message to the PC relaying the reason for stopping. The 1771-PM provides flexibility in selecting clutch/brake controller functions. The switches on the I/O chassis can be set depending on the application requirements. The module can be configured for operator stations 3 and 4, motion detector feedback, valve stem feedback, air pressure feedback, ungrounded or grounded AC power, on-the-hop, half stroke or stroke-and-a-half, dump valve circuit, or micro-inch functions.