Siemens S5-135U/155U appendix 22 x 210 bytes, Is full or an Eprom submodule is inserted

CPUs, Memory Cards, Memory Submodules, Interface Submodules

User Memory	You require a user memory submodule (RAM or EPROM) for storage of your
	program. You can store up to 64 x 210 bytes of code and data blocks here.
	For data blocks, the CPU 922 additionally has an integrated DB RAM of
	22 x 210 bytes.
	Note
	The DB RAM is only loaded with DB/DX blocks when the RAM submodule
	is full or an EPROM submodule is inserted.
	A description of the memory submodules can be found in Sections 5.9 and
	5.10; order numbers are given in the ordering information.

Process Interrupt There is an interrupt line (IR) in the S5-135U/155U PLC for each CPU. It

Processingcan be used when the reaction to one or more events must occur with higher priority than the reaction to other events.

To process an interrupt, cyclic program processing is interrupted and the program stored in OB 2 is inserted. Refer to the CPU 922 Programming Guide for further details.

This interrupt-driven program processing is only possible using an interrupt-capable digital input module (e.g. 6ES5 432-...) or a suitably operating CP/IP module.

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