Siemens 6ES5535-3MA12 SIMATIC S5 CP 535 SINEC H1 Ethernet Communications Processor Module, for connecting S5-115U/H/-135U/-155U/H Central Controllers to Industrial Ethernet H1, 1 x Ethernet Interface, 1 x PG Interface, 1 x Slot for 376 Memory Submodule

Siemens 6ES5535-3LB12 SIMATIC S5 CP 535 SINEC H1 Ethernet Communications Processor Module, for connecting S5-115U/H/-135U/-155U/H Central Controllers to Industrial Ethernet H1, 1 x Ethernet Interface, 1 x PG Interface, 1 x Slot for 376 Memory Submodule

Siemens 6ES5581-0EC12 Siemens 6ES5 581-0EC12 SIMATIC S5 CP 581/486 Basic Board Module for CP 581 Communication Processor Module, with 4MB Working Memory, 33 MHz CPU, MS-DOS 6.2 German, for S5-115U, S5-135U, S5-155U/H PLC

Siemens 6ES5523-3UA11 SIMATIC S5 CP 523 Communications Processor Module, 1 x Serial Input/Output Interface (V.24/TTY) with 10 or 11 Bit Data Format and 3964(R) Transmission Protocol, 1 x Slot for 373 Memory Submodule (EPROM, EEPROM with max. 32 Kbytes)

Siemens 6ES5521-8MA11 SIMATIC S5 CP 521 Communication Processor Module for S5-90U/-95U/-100U PLCs, 1 x Serial Interface, 1 x Submodule Slot

Siemens 6ES5501-5AA11 SIMATIC S5 PG 501 Interface Module for PG 631/670 to S5-130A/K Central Controller or for PG 630/631/670 to S5-210A PLC, 1-Port