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Note:
At altering the encoder's total measuring range during re-parameterization the internal preset-offset-value will
be cleared. This is insignificant for the application since in this case the relation to the position gets lost
anyway. The preset value saved by parameter 971 will of course remain. It must be ensured however that the
former preset value is within the new total measuring range, otherwise a new value has to be stored.
6.7. Alarms
Diagnosis alarms are triggered in line with acyclic services according to DPV1.
A diagnosis alarm is triggered upon the encoder having detected a probably incorrect position. The next
position data telegram is added a high priority bit in the function code (bit 1) by the encoder what makes the
control transmit a acyclic diagnosis alarm request. The encoder responds by an acyclic diagnosis telegram.
"Data Unit" (DU) of this telegram provides the following structure: Octets 1 to 6 correspond to the diagnosis
telegram of cyclic data exchange.
Data Unit:
Octet 1
Station_status_1
Octet 2
Station_status_2
Octet 3
Station_status_3
Octet 4
Diag_Master_Add
Octet 5
Ident_Number
Octet 6
Ident_Number
Octet 7
Block Length
Octet 8
Alarmtyp
Octet 9
Slot
Octet 10
Alarm Spec
Octet 11
Header
Octet 12
Channel
Octet 13
Type of Diagnosis
The alarm is acknowledged by the control under reference to the running alarm sequence number.
The encoder will only consider value 22 (0x16) indicating a position error as „Type of Diagnosis / Alarm
Definition).
A diagnosis alarm is triggered once with each inbound and outbound event. An outbound event alarm
comprises an „Alarm Specifier" for „outbound event" together with a specific sequence number that is
incremented towards the inbound event.
Siemens controls proceed diagnosis OB82 in case of alarm. If this is not implemented in the project the
control will go to STOP in case of alarm.
Alarms resulting from a probably incorrect position can be signalized in three different ways:
DPV1 Diagnosis alarm (as described)
Error signal in G1_XIST2 (see under „Error signals in G1_XIST2")
LED in the bus cover is red continuous for at least 2.5 s
Manual_ProfibusDPV2_BIDE_EN.docx
22.11.12
Value Significance
Diverse bits, see PROFIBUS literature (e.g. Ext. Diagnose
Bit)
Diverse bits, see PROFIBUS literature (e.g. Stat. Diagnose
Bit)
External diagnosis overflow bit
Master address after parameterization (otherwise 0xFF)
Ident number high byte
Ident number low byte
0x07
Following block length in bytes (including this one)
0x01
1 = Diagnostic alarm
0x01
Slot number
xx
Alarm Specifier (in / out) and sequence number (0..31)
0x81
see DPV2 encoder profile
0x40
see DPV2 encoder profile
0x16
see DPV2 encoder profile / Alarm definition
20/41
Baumer IVO GmbH & Co. KG
Villingen-Schwenningen, Germany