General - Siemens SIMATIC PCS 7 Manual

Configuration
4.1

General

4-2
For information on configuration refer to the SIMATIC Manuals /8/, /31/,
/106/, /230/, /231/, /232/, /233/, /234/, /235/, /280/, /282/, /350/, /701/, /702/
and /703/. See Appendix C.
With a PCS7/TM PLC, the exchange of process values
between the PLC and process I/O modules generally takes place via process
image.
With an AS 2xx PLC data are exchanged via direct access to I/O modules
during runtime of the driver block.
The disadvantage of direct access is, for example, extremely long acknowled-
gement and response times on a "long" I/O bus or with I/O modules distribu-
ted from AS 235 over larger distances. This is improved with PCS7/TM and
an I/O communication module TPM 478, as a result of autarkic and processor
controlled mapping of I/O values on the TPM 478.
Standard driver blocks, e.g. system version G of the AS 235, address TELE-
PERM M I/O modules with the help of the hierarchical addresses "Module
number" and "Channel number". These are entered in the block parameter
lists when driver blocks are being configured. Here, implicit condition is a
module-conform assignment of TELEPERM M I/O modules and drivers in
the configuration.
This implicit module assignment in TPM 478 is no longer available in the
application image in, or it is rudimentary and inconsistent. Therefore, supple-
mentary configuration is required.
Connecting TM I/O to PCS 7
C79000-G8076-C710-04