Manual ((link)): M91-t4-r6-zk1

: DIN rail or rear-panel screws. Maintain 50 mm clearance for ventilation.

Equipped with an RJ-11 port that supports RS232 or RS485 communication, enabling MODBUS connectivity and PC programming via U90 Ladder software. M91-t4-r6-zk1 Manual

: Press and hold SET + UP for 3 sec → relay outputs can be forced via terminal mode. : DIN rail or rear-panel screws

: The "T4" designation indicates it is suitable for mounting on the flat surface of a Type 4X enclosure Unitronics Core Functionality & Communication Vision V120™ , M91™ PLC User Guide - Unitronics M91™ PLC User Guide - Unitronics