Allows connection of external modules (relay card, measuring module) to the control center PSS-224 C
Remote modules can be installed up to 1.2 km away from the actual center
The visual message of active external relay card takes over the LED display module PLE-628 A
Makes the coupling of two control-center PSS-224 C in master / Slave operation possible. The slave center can operate independently in its own bus-section. It is possible further bus devices (regardless of the main unit) connected to the second central