The multi-channel parallel I/O modules I-80xx are used in I/O systems of the I-8K series. They have an internal parallel interface that enables a considerably faster transfer rate compared to the I-87xxx serial modules. An I-8K system with parallel I-80xx plug-in modules together with a self-written programme is therefore ideally suited as a soft PLC or stand-alone system. The I/O modules are available in high profile or low profile versions, depending on the form factor of the I/O system.