Baumer GXAMW Manual - Page 20

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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

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