Transferring As-I Analog Values - Siemens AS-i Master CM 1243-2 a Manual

6.3

Transferring AS-i analog values

You can access analog data of an AS-i slave via cyclic services if you have configured this
AS-i slave in STEP 7 as an analog slave (see section "Configuring AS-i slaves (Page 40)").
If you are not configuring any analog slaves, you can only access the data of the AS-i slave
via the acyclic functions (see section "Accessing AS-i analog data via acyclic services
(Page 52)").
Note
The following information is only applicable to AS-i slaves that process analog value transfer
in accordance with the AS-i slave profile 7.3, 7.4, 7.5.5, 7.A.5, B.A.5, 7.A.A, 7.A.8, 7.A.9 or
6.0 (Combined Transaction Types CTT1 ... 5 according to AS-i Specification V3.0).
Analog value transfer according to the older AS-i slave profiles 7.1 and 7.2 is not supported
by the AS-i master CM 1243-2.
The address of the analog slave is displayed in the inspector window of the slave.
Figure 6-1
SIMATIC S7 accesses analog data via word commands, e.g. using the comparator
functions.
The address for accessing multi-channel analog AS-i slaves can be obtained from the table
below:
Table 6- 3
Byte no. (start address + offset)
Start address + 0
Start address + 1
Start address + 2
Start address + 3
Start address + 4
Start address + 5
Start address + 6
Start address + 7
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200
Manual, 04/2013, A5E02655230010A/RS-AA/003
Data exchange between the user program and AS-i slaves
I/O address analog slave
Address area for the analog values of an AS-i slave
6.3 Transferring AS-i analog values
Analog value channel
Channel 1 / high byte
Channel 1 / low byte
Channel 2 / high byte
Channel 2 / low byte
Channel 3 / high byte
Channel 3 / low byte
Channel 4 / high byte
Channel 4 / low byte
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