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8.
Diagnostic signals
Diagnostic signals contain data relating to the respective status of the encoder. The diagnostic signals
comprise Profibus-relevant information and device-specific information. The master controls communication
with the slave using this information, or forwards it to the higher-level system.
The master requests diagnosis data both prior to parameterization and after configuration of the slave.
This ensures that the slave is present in the bus and that the data stored in the control system software is in
agreement with the data stored in the slave. The slave can also register a diagnosis event in the
Data_Exchange mode. The master then requests the diagnosis data. The user-specific information is defined
in the EN 50170 standard under Encoder profile 1.1.
The display element integrated in the bus cover (dual red/green LED) indicates part of this information.
8.1. Description of the diagnosis data Slave_Diag
Device
class
Diagnosis data Octet no. Significance
1 Station status 1 1
Status of

Parameterization

Configuration

Diagnostic data (Diag.ext. bit and Diag.stat. bit in case of
alarm and warning signals)
1 Station status 2 2
Status of

Response monitoring

Freeze or Sync mode
1 Station status 3 3 Not supported
1 Diag_Master 4 Address of the master which first parameterized the slave
1 Ident_number 5 to 6
Device identifier

Unique for each device type

Reserved and stored with the PNO
1
Extended diagnosis
header
7
Length of the encoder diagnosis including diagnosis header
byte in the case of extended diagnosis
1 Alarm signals 8
Display of malfunctions which could lead to incorrect position
values.
Triggered by

Code consistency error or inadmissible preset value

Preset value is outside the admissible value range.
1 Operating status 9
Indication of supported user-specific data

Counting direction

Functional scope of the encoder, defined in device class 1
and 2

Extended diagnosis

Scaling function
1 Encoder type 10 Indication of encoder type
1 Steps per revolution 11 to 14 Maximum resolution per revolution of the encoder
1 Number of revolutions 15, 16 Maximum number of revolutions of the encoder
2
Additional alarm
signals
17 Not supported
2 Supported alarm signals 18
Indication of which alarm is supported

Incorrect position value
Continued on next page.