How The Pg Functions Work Via The S5 Bus - Siemens CPU 948 Programming Manual

11.5.2
How the PG Functions Work
via the S5 Bus
Using pages
Interface numbers (SSNR)
CPU 948 Programming Guide
C79000-G8576-C848-04
For communication with the CPUs, the CP 143 has four pages
(interfaces). If you do not use the PG functions via the S5 bus, all the
pages are available for communication using handling blocks (HDBs).
When using the S5 bus functions, the pages of the CPU are divided
into two pages for user HDBs and two pages for PG functions.
The pages for user HDBs can be used as previously for SINEC H1
applications. Remember, however, the special features listed in
Section 11.5.3.
The pages for PG functions are used by the CP 143 and the CPU 948
for the PG functions via the S5 bus and are therefore no longer
available for communication via handling blocks.
The PG functions via the S5 bus are activated automatically in the CP
143 when you set the base interface number of the CP to 232 or 236
(jumpers and SYSID). You then occupy interface numbers 232 to
239. Interface numbers 240 to 247 are intended for later expansions
(e.g. CPs with eight pages/interfaces).
SINEC H1
232
233
SINEC H1
PG functions
234
235 PG functions
236 SINEC H1
237 SINEC H1
PG functions
238
239 PG functions
.
reserved (8 pages)
.
Fig. 11-11 Interface assignment of the PG functions via the S5 bus
PG Functions via the S5 Bus
CP 1
CP 2
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