Support for service activities at a programmable logic controller (PLC)

摘要

A PLC includes a first and second module. The first module having terminal positions and/or connectors behind a door located on its front side as well as having a display, and with the second module having a display unit. For servicing the first module, status messages for terminal position and/or connector of the first module are transmitted via a communication link to the second module and are displayed by a display of the second module.