Technical data

Operation / processing CPU 922 CPU 928 CPU 928B
Size of the memory
Size of the user memory
(in Kbytes) per submodule 64 64 64
Size of the memory for data blocks
(DB-RAM, in Kbytes) approx. 22.2 approx. 46.6 approx. 46.6
Timers and counters, flags
Number of timers and counters 128 each 256 each 256 each
Number of flags 2048 flags 2048 flags 2048 flags
+ 8192 S flags
Definition of terms
Basic time The basic time is the part of the cyclic system runtime required
without updating the process image, without transferring IPC flags
and without interrupts or errors.
Response time The response time is the time from activating the program processing
level PROCESS INTERRUPT for processing the first operation in
OB 2. It is a prerequisite that OB 2 can be called
immediately after
recognizing the process interrupt. The response time is extended if the
program
waits until the next operation or block boundary
Appendix 1: Technical Data of the CPUs in the S5-135U
CPU 928B Programming Guide
12 - 6 C79000-A8576-C898-01