Siemens S5-135U/155U System Manual page 212

Siemens network card system manual
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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 2
For data blocks, the CPU 922 additionally has an integrated DB RAM of
22 x 2
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
Processing
can 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.
5-72
10
bytes.
10
bytes of code and data blocks here.
C79000-G8576-C199-06
System Manual

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