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4.2 Switching on the supply voltage
After the connection has been made, the supply voltage can be switched on.
The measuring system is initialized first of all and is then in INIT status. In this status,
no direct communication is possible between master and measuring system via the
application layer. The measuring system can be gradually transferred to
OPERATIONAL status according to the state machine via the EtherCAT master:
PRE-OPERATIONAL
The "Start Mailbox Communication" command puts the measuring system into PRE-
OPERATIONAL status. In this status only the mailbox is active first of all, and master
and measuring system exchange application-specific initializations and parameters. In
PRE-OPERATIONAL status only a parameterization via Service Data Objects is
initially possible. However, it is possible to configure PDOs using SDOs.
SAFE-OPERATIONAL
The "Start Input Update" command puts the measuring system into SAFE-
OPERATIONAL status. In this status the measuring system provides valid current
input data, without changing the output data. The outputs are in safe status.
OPERATIONAL
The "Start Output Update" command puts the measuring system into OPERATIONAL
status. In this status the measuring system provides valid input data and the master
provides valid current output data. When the measuring system has detected the data
received via the process data service, the status transition is confirmed by the
measuring system. If activation of the output data was not possible, the measuring
system remains in SAFE-OPERATIONAL status and outputs an error message.
Printed in the Federal Republic of Germany
06/20/2017
TR - ECE - BA - DGB - 0127 - 04
TR-Electronic GmbH 2016, All Rights Reserved
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