Burkert Type 8644 - Manual (Page 61)

8644/phoenix - 57
S
YSTEM
D
ESCRIPTION
• Cancel / Error fragment
Byte 1 - Service in the Cancel / Error fragment:
Bit 7 Request/Response
0 = Request
1 = Response
Bit 6:5 fragment type
11= Cancel / Error fragment
Bit 4:0 Reserved
When a service has been completed, acknowledge with the service 00 (clear). The other bytes in the VC1
are then „don’t cares“. The DPV1 thus receives the signal that the result has been received by the master.
The VC1 module can then receive the next service.
Examples
The same examples as for the DPV1 services are used, in order to clarifiy the correlations.
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)
Clear Request (Master Slave)
Clear Response (Slave Master)
Example 2
Reading the object 5FFF, sub-index 2 of a IL RS232 on slot 3
Read Request (Master Slave)
Data (4 words VC1) Configuration of the data
03 00 00 05 00 | 00 00 00 Read /Slot / Index high / Index low / Sub-index | 3 Byte unused
Data (4 words VC1) Configuration of the data
83 00 03 03 01 00 | 00 00 Read-Response / Status / Actual length / 3 Byte Object data | 2 Byte
unused
Data (4 words VC1) Configuration of the data
00 xx xx xx xx xx xx xx Clear
Data (4 words VC1) Configuration of the data
00 00 00 00 00 00 00 00 Clear Response
Data (4 words VC1) Configuration of the data
01 03 5F FF 02 | 00 00 00 Read-PCP / Slot / Index high / Index low / Sub-index | 3 Byte unused