The Siemens 6AV3505-1FB01 OP5-A1 is a SIMATIC OP operator panel with a 4-line, 20-character display designed for use as a human-machine interface in compatible automation systems. It provides one serial TTY/V.24 interface and measures 120 × 168 × 48 mm, weighing about 800 g. Belonging to the SIMATIC HMI family as the OP5/A1 variant, Siemens notes that for new applications the OP7 model is recommended. This model is commonly catalogued as a discontinued OP panel, with suppliers indicating repairable status for legacy installations.
