Addressing
S7-300 Programmable Controller Hardware and Installation
7-10 A5E00105492-01
7.6 Consistent data
Consistent data
The table below shows what you have to take into account for communication in a
DP master system if you want to transfer I/O areas with "Total length" consistency.
CPUs 315-2 DP, 316-2 DP
CPU 318-2 DP
(Firmware version < V 3.0)
CPU 318-2 DP
(Firmware version≥ V 3.0)
CPUs 31xC
Even if they exist in the
process image, consistent
data is not automatically
updated.
You can choose whether or
not to update the address
area of consistent data in the
process image.
The address area of
consistent data in the
process image is
automatically updated.
To read and write consistent
data, you must use SFC14
and 15.
To read and write consistent data, you can also use SFC14
and 15.
If the address area of consistent data is not in the process
image, you must use SFC14 and 15 to read and write
consistent data.
Direct access to consistent areas is also possible (e.g.
L PEW or T PAW).
You can transfer a maximum of 32 bytes of consistent data.
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