Siemens SIMATIC ET 200AL, System Manual

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High-precision input/output with Time-based IO
Function Manual, 11/2019, A5E33454822-AC
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Programming
4
4.1 Overview of instructions
Introduction
Time-based IO is used with special instructions (TIO instructions). The TIO_SYNC TIO
instruction is responsible for synchronizing all involved TIO modules and creates a unique
time basis (TIO_Time) to which all actions are referenced.
Additional instructions undertake the reading in of process input signals with associated time
stamps and/or the time-controlled output of process output signals.
Note
The TIO instructions are helpful for general time-based IO applications. For special
applications, such as cam controllers, there are also separate technology objects, for
example, TO_CamOutput.
Note
The TIO instructions use the time stamp functions of the TIO modules. The other functions of
the TIO modules can be used independently of the TIO instructions in applications.
TIO instructions
Instruction Short description
TIO_SYNC Synchronizes the TIO modules and provides the time basis for Time-
based IO
TIO_DI Detects the edges at the digital input (Timer DI) and supplies the
associated time stamp
TIO_DI_ONCE
•
Detects the edges at the digital input (timer DI) once and provides
the associated time stamp
• Controls a timer DI channel which is configured as an edge-
triggered enable for another channel.
TIO_DQ Outputs time-controlled edges at the digital output (Timer DQ)