SIEMENS » 6AV6351-1GG30-0AA0
WINCC OA DISTRIBUTED SYSTEMS XL/UL V3.9, EXTENDS A WINCC OA SERVER XL/UL WITH THE MULTI SERVER OPTION, CONNECTS AUTONOMOUS WINCC OA SYSTEMS. EACH SERVER REQUIRES ONE LICENSE. A MINIMUM OF TWO VALID SERVER LICENSES IS REQUIRED IN A DISTRIBUTED SYSTEM. A REDUNDANT SERVER PAIR REQUIRES 2 LICENSES ,