Baumer GE-GB-GXxxx - Manual (Page 20)

Manual_ProfibusDPV2_BIDE_EN.docx 20/41 Baumer IVO GmbH & Co. KG
22.11.12 Villingen-Schwenningen, Germany
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: Value Significance
Octet 1 Station_status_1 Diverse bits, see PROFIBUS literature (e.g. Ext. Diagnose
Bit)
Octet 2 Station_status_2 Diverse bits, see PROFIBUS literature (e.g. Stat. Diagnose
Bit)
Octet 3 Station_status_3 External diagnosis overflow bit
Octet 4 Diag_Master_Add Master address after parameterization (otherwise 0xFF)
Octet 5 Ident_Number Ident number high byte
Octet 6 Ident_Number Ident number low byte
Octet 7 Block Length 0x07 Following block length in bytes (including this one)
Octet 8 Alarmtyp 0x01 1 = Diagnostic alarm
Octet 9 Slot 0x01 Slot number
Octet 10 Alarm Spec xx Alarm Specifier (in / out) and sequence number (0..31)
Octet 11 Header 0x81 see DPV2 encoder profile
Octet 12 Channel 0x40 see DPV2 encoder profile
Octet 13 Type of Diagnosis 0x16 see DPV2 encoder profile / Alarm definition
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)
E rror 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