Siemens SIMATIC ET 200AL, System Manual

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Functions
5.2 Intelligent IO devices (I-devices)
PROFINET with STEP 7
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Function Manual, 05/2021, A5E03444486-AL
Rules for RT and IRT communication.
IO systems with I-devices are also suitable for setting up real-time applications with RT and
IRT communication. The following rules must be followed for this:
•
Both the higher-level and the lower-level IO system support RT communication. You can
use RT communication for both IO systems at the same time.
• IRT communication can be combined with RT communication. You can use IRT
communication in one of the two IO systems. Use IRT either in a higher-level or in a lower-
level IO system.
5.2.10 Configuring PROFIenergy with I-devices
The requirement for program-controlled pauses for saving energy with PROFINET devices is
that the PROFINET devices support the PROFIenergy protocol.
Only if a PROFINET device (I/O device) supports the PROFIenergy protocol does an I/O
controller actually send PE commands to this I/O device, for example to start or stop pauses.
If an I/O device supports the PROFIenergy protocol, this property is saved in its PROFINET GSD
file and is available for configuration in an engineering system.
For S7-1500 CPUs as intelligent I/O devices (I-devices), you have the option with STEP 7 V13
service pack 1 or later to set PROFIenergy support for each transfer area.
If you have selected the "Enable PROFIenergy communication" option for a transfer area and
import the generated PROFINET GSD file into another project, you can handle an I-device as a
PE entity there.
Requirements
• STEP 7 as of V13 service pack 1
• CPU supports PROFIenergy with I-devices, for example CPU 1215C DC/DC/DC as of
firmware version 4.2
• You use the PROFINET IO interface as an I-device and have created transfer areas.
• The user program in the I-device handles PROFIenergy commands
Background: You need to program PROFIenergy functions with I-devices in the user
program using the "PE_I_DEV" instruction and corresponding auxiliary blocks; this is
different compared with IO devices for which this functionality is made available by the
firmware. You may therefore only activate the PROFIenergy support for transfer areas if
the user program in the I-device is configured correspondingly as well.