7 Data Exchange between PROFINET IO Controller and AS-i Slave
118
IE/AS−INTERFACE LINK PN IO as of hardware version 1, as of firmware version V2.0
Release 08/2018
C79000−G8976−C216−03
Representation of the analog values or transparent values
The analog values are interpreted as 16-bit values in two’s complement.
The transparent values are interpreted as two independent bytes.
For further information regarding the range of values, the measurement range and
the accuracy please refer to the relevant documentation of the analog slaves.
7.3.1 Accessing AS-i Analog Data using Acyclic Services
PROFINET IO controller with acyclic services
As alternative to cyclic data transfer, the acyclic services of PROFINET IO allow
special jobs to be used for sending output data to the IO devices or receiving input
data of the IO devices.
The acyclic services are used on the IE/AS-i LINK for the data record interface
(see Chapter 8).
Access to analog data using acyclic services can be selected, for example to save
I/O address space on the SIMATIC S7.
In the default configuration of the IE/AS-i LINK in STEP 7 with only digital slaves, it
is possible to access the analog data of the slaves with the data record interface if
the configuration identifiers (I/O configuration, ID code, ID 1 code, ID 2 code) are
left with their default setting (F
H
).
Notice
Simultaneous writes to analog data of a slave either using cyclic services, in other
words via configured analog modules or using acyclic services (data records) is
not permitted.
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