Specifications

AS-Interface Slaves
I/O modules for operation in the field
Analog I/O modules, IP67 - K60
6/98
Siemens IK PI · 2009
6
■ Function
Data transfer according to analog profile 7.3/7.4
With analog profile 7.3/7.4 at least seven AS-Interface cycles
must be passed through before transmission is completed. This
requires the use of a master according to extended specification
V2.1.
With input modules the complete analog value is then available
in the AS-Interface master. Preprocessing is thus performed in
the master.
With the next system function call the user program brings the
analog value as one value into the user program. Hence the
analog value is very quickly updated.
The analog value transmission applies in reverse order for the
output modules as well.
In total this results in the following maximum times before the
analog value is available with profile 7.3/7.4
1)
:
1)
With presetting: smoothing function deactivated; line filter 50 Hz
Data transfer according to analog profile 7.A.9
With analog profile 7.A.9, only three or four AS-Interface cycles
are needed for the transmission. This requires the use of a mas-
ter according to specification 3.0.
• Maximum times before the analog value is available with pro-
file 7.A.9 are offered in the manual with full details according
to the mode selected (resolution, number of channels,
A/B technology)
G_NSA0_XX_00181
Analog module
One User program
cycle with
system
function call Conversion
Analog valueCPU
Seven
AS-Interface
cycles
(max. 5 ms each)
Note: Values can be accesses with SFC58, SFC59
integrated standard function blocks
AS-Interface
Master
1 channel 2 channels 4 channels
Conversion and
transmission time
Max. 95 ms Max. 235 ms Max. 435 ms
G_NSA0_XX_00436
Analog module
One user program
cycle with
system
function call Conversion
Analog valueCPU
Three or four *
AS-Interface
cycles
(max. 5 ms or
10 ms each** )
* depending on resolution with 12 or 14 bit
** with A/B technology
AS-Interface
Master