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TR-Electronic GmbH 2016, All Rights Reserved
10/31/2018
TR - ECE - BA - DGB - 0131 - 02
Page 73 of 103
5.3 Starting up on the PROFIBUS
Before the measuring system can be accepted for "Data_Exchange", the master must
firstly initialize the measuring system at start-up. The resulting data exchange between
the master and the measuring system (slave) is divided into the parameterization,
configuration and data transfer phases.
It is checked whether the projected nominal configuration agrees with the actual
device configuration. The device type, the format and length information as well as the
number of inputs and outputs must agree in this check. The user is therefore reliably
protected against parameterization errors.
If the check was successful, it is switched over into the DDLM_Data_Exchange mode.
In this mode, the measuring system e.g. sends its actual position, and the preset
adjustment function can be performed.
Power On/
Reset
WPRM
WCFG
DXCHG
DP Watchdog
Initialization
Parameter not ok
Parameter ok
Configuration ok
Parameter and Configuration ok
Outputs Receiver/
Return Inputs
Configuration not ok
Unlock
Configuration not ok
Parameter not ok
Output length false
WPRM = Wait Parameter
WCFG = Wait Configuration
DXCHG = Data Exchange
Figure 5: DP slave initialization
