Siemens SIMATIC NET CP 343-2 Manual page 51

Special cases when transferring analog values in the output direction
S The following applies in the output direction:
S With firmware version V2.x, the AS−i master interrupts the transfer of the
analog output values when the CPU is in STOP. How the analog slave reacts
depends on the particular device.
S As of firmware V3.0, the AS−i master sends the substitute value "0" to all slaves
when the CPU is in STOP.
Special cases when transferring analog values in the input direction
S In the input direction the AS−i returns the substitute value 7FFFh when
− The AS−i slave has failed or does not exist
− The channel number is not supported by the analog slave
− The analog slave signals "Value Invalid"
According to AS−i Specification 3.0, these are slaves with the following profiles:
6.0.A to 6.0.C
7.3.4 to 7.3.7
7.3.B to 7.3.F
7.4.1 to 7.4.F
7.A.9
7.A.8 (ID1 = 6)
7.A.8 (ID1 = 7)
7.A.5 and 7.5.5 and B.A.5
S Transparent data:
In the input direction, the AS−i master returns the substitute value 0h when the
analog slave supplies transparent data and when
− This analog slave has failed
− This analog slave signals "Value Invalid"
According to the AS−i Specification 3.0, these are slaves with the following
profiles:
6.0.2 to 6.0.4
7.3.0 to 7.3.3
7.3.8 to 7.3.A
7.A.A
7.A.8 (ID1 = 3,4,5)
Note
If the CP 343-2 is used in the ET 200M, only a limited number of
read_data_record and write_data_record jobs can be active at the same time on
the S7 CPU. The maximum number of jobs depends on the S7 CPU.
If more jobs are triggered, these are terminated with the error 80C3h (temporary
lack of resources). The rejected job must then be repeated.
CP 343−2 / CP 343−2 P AS−Interface Master
Release 08/2008
C79000−G8976−C149−04
4 Data Exchange between User Program and AS−i Slaves
51