Siemens SIMATIC ET 200SP Manual page 17

Distributed application
You can use the technology module in a distributed configuration by using an interface
module in the ET 200SP distributed I/O system. The following applications are possible:
● Distributed operation in an S7-1500 system
● Distributed operation in an S7-1200 system
● Distributed operation in an S7-300/400 system
● Distributed operation in a third-party system
Isochronous mode
The technology module supports the system function "Isochronous mode". This system
function enables position, counter and measured values to be recorded 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 change in the state of a digital
input immediately affects the planned reaction of the technology module and changes the
status bit of the digital input in the feedback interface (Page 40).
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.
The position or counter value and, if required, the measured value and the status bits as well
are captured at the time T
current bus cycle.
In isochronous mode, there is always data consistency across all bytes in the feedback
interface.
Technology module TM PosInput 1 (6ES7138-6BA00-0BA0)
Manual, 02/2014, A5E33015755-AA
and made available in the feedback interface for retrieval in the
i
Product overview
2.2 Functions
17