Burkert Type 8644 - Manual (Page 54)

50 - 8644/phoenix
S
YSTEM
D
ESCRIPTION
When accessing the DPV1 field bus node, use the know DPV1 format, carry out write and read accesses in
1 (2) steps. As with PROFIdrive, the data block <Data> is expanded by additional parameters for accesses
to the local bus, the sequence now consists of 2 (4) steps.
The parameters have the following relevances:
<DPV1-Service> in request differentiation between DPV1 read (0x5E) and DPV1 write
(0x5F); in response differentiation between 0xDE (Read-Error) and 0xDF
(Write-Error)
<Slot> The slot for the module in the station to be addressed. The DPV1 bus node is
addressed with Slot=0, the first E/A module with Slot=1, the second with
Slot=2 etc.
<DPV1-Index> Index 48 should be used for accesses to the communication objects of the
local bus Index 2-5 should be used for the other services. Index 47 is
reserved for future purposes and should therefore not be occupied (see also
table
Objects on the DPV1 field bus node).
<DPV1-Length> For write accesses, the length of the subsequent data is indicated here, for
write accesses, the length of the expected data. In the event of a response,
the actual length of the DPV1 data is found here.
<Error-Data (PCP/DPV1)> error codes from the PCP access of the local bus
<Error-Decode> 0x80 identifies errors in DPV1
<Error-Code 1> and error codes from the DPV1 access
NOTE When accessing PCP, ensure that the first byte of the PCP data block indicates whether the
PCP object should be read or written, PCP Read (=0x01) and PCP Write (=0x02).
Examples
The following examples provide you with a quick introduction. They show how objects are can be read and
written on the DPV1 field bus node and the E/A modules.
Example 1
Reading the attached local PCP participants and their status (slot 0, index 1 on the DPV1 field bus node)
Read Request (Master Slave)
Read Response (Slave Master)
Example 2
Reading the object 5FFF, sub-index 2 of an IL RS232 on Slot 3
Write Request (Master Slave)
Data Configuration of the data
5E 00 05 20 Read/Slot/Index/max. Length
Data Configuration of the data
5E 00 05 03 03 01 00 Read/Slot/Index/Actual length/3 Byte Object data
Data Configuration of the data
5F 03 30 04 01 5f ff 02 Write/Slot/Index/Length/Read-PCP/Index High/Index Low/Sub-index