Siemens 6ES5948-3UR22 Siemens 6ES5 948-3UR22 SIMATIC S5-155H CPU 948R-2 Processor Module for S5-155H Central Controllers, 1664 Kbytes Internal Memory for User Program/Data (RAM) and up to 4096 Kbytes External Memory for User Program/Data Storage (Flash EPROM) with Memory Submodule, 1 x 20 mA Current Loop Interface (TTY) for OP/PG/PC (15-way Cannon socket), 1 x Slot for PG Interface Module for connecting devices with TTY (20 mA Current Loop) Interface for OP/PG/PC, 1 x Slot for Memory Submodule (Flash EPROM), Double-width