Address Space; Isochronous Mode - Siemens SIMATIC S7-1500 Manual

4.1.4

Address space

Address space of the technology module
Table 4- 6
Size per channel
Total size
4.1.5

Isochronous mode

The technology module supports the "Isochronous mode" system function. This system
function enables position, counter and measured values to be acquired in a defined system
cycle.
In isochronous mode, the cycle of the user program, the transmission of the input signals
and processing in the technology module are synchronized. The output signals switch
immediately if the relevant comparison condition is met. A status change of a digital input
immediately triggers the specified reaction of the technology module and the change of the
status bit of the digital input in the feedback interface.
Use an OB of type "Synchronous Cycle" (e.g. OB61) in this operating mode. The
High_Speed_Counter or SSI_Absolute_Encoder instruction is called in the assigned OB.
The update time for the measured value is synchronized with the system cycle in a suitable
ratio and, if necessary, adapted in length. If you set "0", the measured value is updated once
per system cycle.
Data processing
The data that was transmitted to the technology module in the current bus cycle via the
control interface takes effect when it is processed in the internal technology module cycle. At
the time the input data is read in (T
as well as status bits are acquired and made available in the feedback interface for retrieval
in the current bus cycle.
Technology module TM PosInput 2 (6ES7551-1AB00-0AB0)
Manual, 06/2018, A5E03982218-AB
4.1 Operating with "Counting and measurement" technology object
Size of input and output addresses of the TM PosInput 2 when operating with "Counting
and measurement" technology object
Inputs
16 bytes
32 bytes
), the position or counter value and the measured value
i
Configuring/address space
Outputs
12 bytes
24 bytes
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