B.6 Rules For Direct Access To The Distributed I/O System - Siemens SIMATIC S5 Manual
Distributed i/o system
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Access commands for the S5-115U, S5-135U and S5-155U programmable controllers
B.6 Rules for direct access to the distributed I/O system
Overview
What is
consistency?
B-12
This section describes the rules you must observe in order to maintain data
consistency in direct access to the distributed I/O system.
Section
B.6.1
S5-115U: CPUs 941, 942, 943,
B.6.2
S5-115U: CPU 944
B.6.3
S5-115U: CPU 945
B.6.4
S5-135U: CPU 922
B.6.5
S5-135U: CPU 928
B.6.6
S5-155U: CPUs 946/947, 948
Data which evinces a relationship on account of its content is said to be
consistent.
Consistent data is processed, for example, by analog modules, CPs, IPs in an
ET 200U or by the S5-95U with SINEC L2 DP interface.
Example: The following are consistent on account of their content:
the high byte and the low byte of an analog value (word consistency)
job number and the associated parameters of the job, e.g. in a CPU job
addressing a CP (consistency across 4 words).
Topic
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Page
B-16
B-18
B-20
B-22
B-24
B-26
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