Siemens SIMATIC ET 200AL, System Manual

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Functions
5.11 Saving energy with PROFIenergy
PROFINET with STEP 7
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Function Manual, 05/2021, A5E03444486-AL
PROFIenergy instructions for IO controllers
Two instructions are needed for controlling and monitoring the PROFIenergy functions.
The instruction
PE_START_END allows you to easily activate and deactivate the idle state of
PROFINET devices. This occurs by means of an incoming edge or outgoing edge. The
instruction PE_START_END provides a simple interface for implementing the PROFIenergy
commands Start_Pause and End_Pause.
The instruction
PE_CMD allows you to transmit all PROFIenergy commands, including
Start_Pause and End_Pause. The other commands can be used, for example, to query the
current status of the PROFINET device or the behavior during the pauses. The instruction
PE_CMD is a convenient means for handling all PROFIenergy functions.
PROFIenergy instruction for I-devices
The instruction PE_I_DEV allows you to also implement PROFIenergy on I-devices. The
instruction receives PROFIenergy commands on the I-device and forwards these to the user
program for execution. After executing the command, the user program calls the PE_I_DEV
instruction again in order to send the acknowledgment to the IO controller. For these replies,
each command offers you a helper instruction that supplies the reply data to the instruction.
The instructions can be found in the "Instructions" task card of the STEP 7 program editor.
Configuration and programming
The functions can be comfortably integrated into existing systems. No configuration is
required for the use of PROFIenergy. However, amendments to the user program are
required:
•
Before the "Start_Pause" command, you must ensure that your system is brought into a
condition that is suitable for a pause.
• A sequential control system for the beginning of the pause of the devices and for the
punctual restarting of the device on break must be programmed (depending on the
required startup times that the respective PROFINET device demands).
• The error messages of the PE_CMD instruction must be evaluated, and the required
reaction must be programmed (for example, cancellation or continuation of further
commands on lower-level PROFINET devices).
Note
In the case of the ET 200S distributed I/O system, you have to configure the application of
PROFIenergy in STEP 7. You configure PROFIenergy by selecting the "Use energy saving for
this potential group" check box in the PM-E DC24V/8A RO power module.
If you want to use PROFIenergy for an I-device, you have to configure this in STEP 7.
Information about configuring PROFIenergy for an I-device is available in the section
Configuring PROFIenergy with I-devices (Page 1).