: Press and hold SET + UP for 3 sec → relay outputs can be forced via terminal mode.
Disclaimer: Always consult the official, latest version of the Unitronics manual for the specific unit's revision. M91-t4-r6-zk1 Manual
Must be panel-mounted on the flat surface of a Type 1 or Type 4X industrial enclosure. : Press and hold SET + UP for
Unlike modern PLCs using IEC 61131-3, the M91 series typically uses (a free, legacy software). The manual’s programming section covers: M91-t4-r6-zk1 Manual
