Siemens SIMATIC ET 200AL - Time-Based IO; TIO_SYNC: Synchronizing TIO Modules

Programming
4.3 Time-based IO
High-precision input/output with Time-based IO
34 Function Manual, 08/2014, A5E33454822-AB
4.3
Time-based IO
4.3.1
TIO_SYNC: Synchronizing TIO modules
Description
You can use Time-based IO with the TIO_SYNC instruction. TIO_SYNC synchronizes TIO
modules to a shared time basis TIO_Time.
You can synchronize up to 8 TIO modules with TIO_SYNC. All TIO modules must be
assigned to the same process image partition (PIP). If you select "0" for the input parameter
PIP_Mode, you assign the number of the process image partition at the PIP_PART input
parameter.
Startup characteristics
At the startup of the CPU, the TIO_SYNC instruction receives and checks the input
parameters once and initializes the TIO_Time. If startup takes place without errors, the
instruction changes to normal operation. In the event of an error, the instruction does not
change to normal operation and generates an error message.
Operating principle
In normal operation, the instruction ensures synchronization of all TIO modules configured at
the HWID input.
The calculated TIO_Time for the instructions of the TIO modules is provided at the
TIO_SYNC_Data
output.
Reaction to error
The Error output indicates whether the instruction parameters are assigned correctly and
whether an error has occurred. If the instruction was not processed successfully, the reasons
for the errors are displayed at the Status output.