Siemens SIMATIC PG, accessories second-level cache submodule for PG 740 with processor 80486, 256 KB, mature lifecycle.
The Siemens 6ES7791-0BH00-0XA0 is a second-level cache submodule designed for the SIMATIC PG 740 programming device equipped with an Intel 80486 processor, providing 256 KB of additional cache memory.
This submodule plugs into the PG 740's internal expansion slot, boosting the processor's cache for faster program execution during PLC programming and diagnostics. It is specific to the PG 740 with the 80486 CPU — not compatible with later Pentium-based PG models or other SIMATIC programmers.
There is no pin-compatible direct replacement within the SIMATIC PG 740 family. The 256 KB cache is a fixed specification for this CPU generation; upgrading to a later PG model would require a different cache architecture.
The evidence does not list RoHS, REACH, UL, or IEC certification details for this order code. As a mature-lifecycle accessory for a legacy device, compliance documentation may be limited to the original Siemens product information.
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